The two time trials total 71 km (38 km + 33 km), the most since 2012. There are only three summit finishes in 53,450 m of climbing.
Back to the trend of the day: The 2027 Tour de France will start in Scotland and finish in Paris
Poly Rating · from the trend of the day
Tour de France 2027 route stages: 10 that decide yellow
The 2027 Tour has 71 km of individual time trials, the most since 2012, yet the likeliest decider is still one Pyrenean day: about 5,400 m of climbing ending at 2,215 m on the Col du Portet, three days before Paris.
- No. 1: Tour de France 2027 Stage 18: Pau to Col du Portet
- 10 places
01Final list
The leading AIs each built their own list of ten independently. Here is one result that is easy to check: every place has a reason, a source, and the list of AIs that included it.
Order: from most to least AI agreement.
A bright badge means this AI put the entry on its list. A dim badge means it did not.
- 1
Tour de France 2027 Stage 18: Pau to Col du Portet
Soulor, Tourmalet, Ancizan, then Portet (16 km at 8.7%): about 5,400 m in 174 km, ending at 2,215 m. One answer gives 4,850 m without a source.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 1 · ChatGPT: 1 · Meta: 1 · Gemini: 1 · Wenxin: 1
What each AI noted 5
- Claudeplace 1
5,400 m of climbing and the Tourmalet, with the finish at the Tour's highest point (2,215 m), three days before Paris.
Source ↗ - ChatGPTplace 1
The route's reported 5,400 metres of climbing culminate at 2,215 metres above sea level: the strongest single-stage candidate to break the yellow-jersey battle open.
Source ↗ - Metaplace 1
5,400m climbing to 2,215m — 10% of Tour's total ascent in one day with Soulor + Tourmalet + Ancizan + Portet
Source ↗ - Geminiplace 1
A brutal 16 km summit finish at 8.7% rising to the 2,215 m Cima Coppi, where previous finishes extracted gaps of over 1m40s between podium rivals.
Source ↗ - Wenxinplace 1
First ever combined double ascent of Col du Tourmalet and Col d'Aubisque in 2027 Tour history, on stage 18 with 53450m total cumulative race elevation already in riders' legs
Source ↗
5 AIs put it here - 2
Tour de France 2027 Stage 19: Hasparren to Laruns
Last mountain day, straight after the queen stage: about 4,300 m, Burdincurutcheta 8.7 km at 9.3%, Marie Blanque 7.7 km at 8.6%, then a descent to Laruns.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 6 · ChatGPT: 2 · Meta: 3 · Gemini: 5 · Wenxin: 2
What each AI noted 5
- Claudeplace 6
No summit finish, but the Marie Blanque is 7.7 km at 8.6% only 20 km from the line, on the last mountain day.
Source ↗ - ChatGPTplace 2
The day after the queen stage, the Basque climbs Burdincurutcheta and Bagargui offer an immediate chance to turn yesterday's weakness into a second, potentially decisive loss.
Source ↗ - Metaplace 3
4,300m day after queen stage, Burdincurutcheta 8.7km at 9.3% with 15% ramps — fatigue decider
Source ↗ - Geminiplace 5
A treacherous descent finish following the Col d'Aubisque and Col de Marie-Blanque, historically favoring bold long-range ambushes over passive tempo.
Source ↗ - Wenxinplace 2
Final high mountain Pyrenean stage 6 days before Paris, where GC gaps have expanded an average of 3min 12s across 2022-2026 Tours' equivalent penultimate mountain days
Source ↗
5 AIs put it here - 3
Tour de France 2027 Stage 16: Toulouse time trial (33 km)
33 km against the clock after the last rest day, including Pech-David (800 m at 12–12.4%). A similar late time trial in 2023 split the top two by 1:38.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 3 · ChatGPT: 3 · Meta: 6 · Gemini: 3 · Wenxin: 4
What each AI noted 5
- Claudeplace 3
Only 33 km, but it ends on a 12% wall, a day before the Pyrenees begin to matter.
Source ↗ - ChatGPTplace 3
Thirty-three kilometres against the clock can create a substantial gap without a single mountain attack—and comes just before the final Pyrenean examination.
Source ↗ - Metaplace 6
33km with Pech-David 800m at 12.4% and 20% ramps — last TT could flip podium before Pyrenees
Source ↗ - Geminiplace 3
A rolling 33 km race against the clock immediately after the final rest day, hitting exhausted legs to decide cumulative gaps.
Source ↗ - Wenxinplace 4
33km ITT held immediately before the Pyrenean mountain block, where every second difference here gets amplified across the final three high mountain stages
Source ↗
5 AIs put it here - 4
Tour de France 2027 Stage 7: Blois to Chambord time trial (38 km)
The longer time trial: 38 km on the Loire with no categorised climb, two days before the first summit finish. It's Evenepoel's best chance to lead into the mountains.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 5 · ChatGPT: 5 · Meta: 4 · Gemini: 2 · Wenxin: 3
What each AI noted 5
- Claudeplace 5
The longest time trial of the Tour is also the one that most helps Evenepoel in the fight for yellow.
Source ↗ - ChatGPTplace 5
The 38 km time trial is the longest of the two individual tests and could give a specialist a meaningful buffer before the serious mountains begin.
Source ↗ - Metaplace 4
38km flat TT longest opening chrono since 2012 — forecast 60-90s gaps between GC top two
Source ↗ - Geminiplace 2
The longest flat individual time trial since 2012, designed to create 90-second to three-minute deficits before the mountains even begin.
- Wenxinplace 3
38km opening ITT, the longest opening race time trial in a Tour since 2012 that can hand early 1+ minute GC gaps before the high mountains even start
Source ↗
5 AIs put it here - 5
Tour de France 2027 Stage 9: Villars-les-Dombes to Grand Colombier
First summit finish: the Grand Colombier, 17.4 km at 7.1%, after about 3,750 m and five categorised climbs. It's the last day before a rest day, so nobody saves their legs.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 4 · ChatGPT: 4 · Meta: 5 · Gemini: 4 · Wenxin: 5
What each AI noted 5
- Claudeplace 4
The first summit finish, 17.4 km at 7.1% on day 9: the first real chance to take time.
Source ↗ - ChatGPTplace 4
The first major summit-finish test arrives on stage nine, early enough to establish a hierarchy but late enough for contenders to have accumulated fatigue and pressure.
Source ↗ - Metaplace 5
First summit finish, 17.4km at 7.1% Grand Colombier after 3,750m — rest day next so no saving legs
Source ↗ - Geminiplace 4
A savage 17.4 km Jura summit finish at 7.1% closing the first full week, where isolation on the lower double-digit pitches forces irrevocable splits.
Source ↗ - Wenxinplace 5
First alpine high mountain stage of the 2027 Tour, with the iconic Grand Colombier climb finishing less than 5km from the stage line
Source ↗
5 AIs put it here - 6
Tour de France 2027 Stage 11: Cluses to Les Saisies
Shortest mountain stage, 150 km with about 4,750 m (Gemini: 4,600 m) on 14 July. Col du Pré and Bisanne pack about 25 km at 8% into the last 50 km.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 2 · ChatGPT: 8 · Meta: 2 · Gemini: 6 · Wenxin: 8
What each AI noted 5
- Claudeplace 2
About 4,750 m of climbing, then roughly 25 km at about 8% in the last 50 km: the Alps' hardest day.
Source ↗ - ChatGPTplace 8
A 150 km mountain stage is short enough to encourage sustained aggression and hard enough to punish a team that cannot control the race.
Source ↗ - Metaplace 2
4,750m in just 150km on Bastille Day — shortest road stage but 25km at ∼8% in final 50km
Source ↗ - Geminiplace 6
The Alpine Queen Stage and official Étape du Tour route, racking up 4,600 vertical metres that mercilessly punish team depth.
Source ↗ - Wenxinplace 8
150km high mountain alpine stage that falls on stage 11, the peak period of cumulative rider fatigue in the first half of the 3-week race
Source ↗
5 AIs put it here - 7
Tour de France 2027 Stage 10: Annecy to Sallanches
171 km and about 3,750 m, with the Côte de Domancy (2.5 km at 9.4%), the climb of Hinault's 1980 Worlds, taken twice on the first day after the rest day.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 8 · ChatGPT: 7 · Meta: 7 · Gemini: 7 · Wenxin: 6
What each AI noted 5
- Claudeplace 8
3,750 m and the 9.4% Côte de Domancy climbed twice: a short, steep test.
Source ↗ - ChatGPTplace 7
After the first summit finish and the rest day, the race moves straight into another mountain test: a recovery day on the calendar does not guarantee recovered legs.
Source ↗ - Metaplace 7
Domancy 2.5km at 9.4% twice — same climb that decided 1980 Worlds, 3,750m day
Source ↗ - Geminiplace 7
Tackles Bernard Hinault’s legendary Côte de Domancy at 9.4% in the finale, turning a short Alpine stage into a sprint of anaerobic agony.
Source ↗ - Wenxinplace 6
171km alpine stage with the steep Domancy climb located just 12km from the finish, targeting early fatigue at the end of the first alpine block
Source ↗
5 AIs put it here - 8
Tour de France 2027 Stage 14: Montpellier to Mende
Looks like a transition day, but its 199 km bring about 4,300 m and end on the Croix Neuve: 3 km at 10.2%, where teammates barely help.
Included it: Claude, ChatGPT, Meta, Gemini, Wenxin.In their lists: Claude: 7 · ChatGPT: 6 · Meta: 8 · Gemini: 8 · Wenxin: 9
What each AI noted 5
- Claudeplace 7
4,300 m of climbing in a stage that looks easier than it is, ending on a 3 km climb at 10.2%.
Source ↗ - ChatGPTplace 6
The route's return to Mende brings a punchy uphill finish into the late-race equation, where a short but steep effort can expose a rider who is already struggling.
Source ↗ - Metaplace 8
199km and 4,300m without a HC summit — Croix Neuve finish where GC lost minutes in 2018
Source ↗ - Geminiplace 8
The feared Montée Laurent Jalabert provides a sharp 3 km wall at 10.2% where no teammate can assist and every second must be earned by raw power.
Source ↗ - Wenxinplace 9
199km stage with the iconic Côte de la Croix Neuve climb at Mende sitting 7km from the line, capable of catching GC teams off guard on a seemingly flat transitional day
Source ↗
5 AIs put it here - 9
Tour de France 2027 Stage 3: Welshpool to Cardiff
A long Welsh day, 223 km, with the Côte de Caerffili (2 km at 8.1%; 8.2% in one table) about 12 km out. More likely to cost seconds than to decide the Tour.
Included it: ChatGPT, Meta, Gemini, Wenxin. Did not include: Claude.In their lists: ChatGPT: 9 · Meta: 9 · Gemini: 9 · Wenxin: 7
What each AI noted 4
- ChatGPTplace 9
The 2 km Côte de Caerffili averages a reported 8.1% and sits just 12 km from the finish: early yellow-jersey pressure can arrive before the race even reaches France.
Source ↗ - Metaplace 9
Caerphilly 2km at 8.2% with 12km to go in Wales — could cost yellow jersey contenders 10-20s before France
Source ↗ - Geminiplace 9
A 223 km Welsh rollercoaster exposed to Bristol Channel crosswinds, capable of producing week-one echelons that ruin a climber’s Tour before France.
- Wenxinplace 7
3000m of total climbing on the third stage in Wales, with the Caerphilly climb just 10km from the finish line to spark unexpected GC attacks on British soil
4 AIs put it here - 10
Tour de France 2027 Stage 8: Bourges to Le Creusot
The longest stage at 224 km, the day after the long time trial, ending over Signal d'Uchon (5.7 km at 5.7%, steeper kicks). A trap for riders short of teammates.
Included it: ChatGPT, Meta. Did not include: Claude, Gemini, Wenxin.In their lists: ChatGPT: 10 · Meta: 10
What each AI noted 2
2 AIs put it here
02Worth knowing
What the AIs noticed while building the list.
The Tourmalet and the Col du Portet appear in the same stage for the first time. There is no Alpe d'Huez, Ventoux, Galibier or Izoard, so the Tour is likely to be settled in the Pyrenees.
Recent one-day gaps between the top two: Gavarnie 2026 2:38 (a third of the final 6:26 margin), Hautacam 2025 2:10, the Combloux time trial 2023 1:38. The 7:35 often quoted for 2023 is Pogačar's overall deficit after Courchevel, not a one-stage gap.
Total climbing is given as 53,450 m by most outlets and about 53,000 m by others. Elevation models and route versions differ, so per-stage metres are approximate.
Early reports said Montmartre would be dropped from the Paris stage. Newer stage tables list three Montmartre circuits with Rue Lepic before the Champs-Élysées.
03How we counted
In plain words, no formulas.
1The question
Top 10 Stages of the 2027 Tour de France Most Likely to Decide the Yellow Jersey
2Why this topic
Readers get the stages that will actually decide the 2027 Tour, found by setting the organisers' profiles against measured climb data and past time gaps, which no single route table shows.
3Where it applies
Tour de France 2027, men's race, all 21 stages from Edinburgh (2 July 2027) to Paris-Montmartre
4What we looked at
- Official climbing metres and number of categorised climbs, set against how late in the stage the hardest climbs fall
- Measured gradient, length and altitude of the key climbs (Tourmalet and others), checked against ASO's profile drawings
- Time gaps between the top two overall riders on comparable stages in the 2022–2026 Tours
- Where the stage falls in the three weeks (fatigue), plus likely wind and weather exposure
- ASO / letour.fr, Grand Départ 2027 route presentation — Official stage towns, distances and named climbs (e.g. Côte de Caerffili 2 km at 8.1%)
- ProCyclingUK stage table — Distance, climbing metres (for the mountain stages), named climbs and gradients for each stage
- Domestique Cycling route report — Climb lengths and gradients (Grand Colombier, Bisanne, Marie Blanque, Pech-David) and who each stage favours
- Climbfinder — Independently measured length, gradient and altitude of the key climbs (Col du Portet, Col du Tourmalet)
5Who ranked
The leading AIs, each building its own list of ten independently and naming a source for every place: Claude, ChatGPT, Meta, Gemini, Wenxin.
6How the places were set
The same entry written differently by different AIs was counted as one. The more AIs put an entry on their list, and the higher they put it, the higher its place. "AI agreement" shows how many of the AIs had it on their own list. Sources are only those the AIs found themselves; nothing was added by hand.
04Each AI's own list
🇺🇸 Claude10 places · 4 notes
The same question, answered by Claude alone. The final list above combines all the AIs.
- 1Stage 18: Pau to Col du Portet (22 July 2027)
5,400 m of climbing and the Tourmalet, with the finish at the Tour's highest point (2,215 m), three days before Paris.
Source ↗ - 2Stage 11: Cluses to Les Saisies (14 July 2027)
About 4,750 m of climbing, then roughly 25 km at about 8% in the last 50 km: the Alps' hardest day.
Source ↗ - 3Stage 16: Toulouse individual time trial, 33 km (20 July 2027)
Only 33 km, but it ends on a 12% wall, a day before the Pyrenees begin to matter.
Source ↗ - 4Stage 9: Villars-les-Dombes to Grand Colombier (11 July 2027)
The first summit finish, 17.4 km at 7.1% on day 9: the first real chance to take time.
Source ↗ - 5Stage 7: Blois to Chambord individual time trial, 38 km (9 July 2027)
The longest time trial of the Tour is also the one that most helps Evenepoel in the fight for yellow.
Source ↗ - 6Stage 19: Hasparren to Laruns (23 July 2027)
No summit finish, but the Marie Blanque is 7.7 km at 8.6% only 20 km from the line, on the last mountain day.
Source ↗ - 7Stage 14: Montpellier to Mende (17 July 2027)
4,300 m of climbing in a stage that looks easier than it is, ending on a 3 km climb at 10.2%.
Source ↗ - 8Stage 10: Annecy to Sallanches (13 July 2027)
3,750 m and the 9.4% Côte de Domancy climbed twice: a short, steep test.
Source ↗ - 9Stage 4: Cherbourg-en-Cotentin loop (6 July 2027)
Day 4 on the exposed Normandy coast, with an uphill finish: crosswind makes it the likeliest day to lose time without a mountain.
Source ↗ - 10Stage 13: Aubenas to Montpellier (16 July 2027)
164 km with no climbs, yet the Mistral and Tramontane winds give it the biggest split risk of the flat days.
Source ↗
What Claude noticed
The two time trials total 71 km, the most since 2012. The route also includes only six mountain stages and three summit finishes across 53,450 m of climbing.
The Tourmalet and the Portet are in the same stage (stage 18) for the first time, per Domestique. The Tourmalet is climbed before the 16 km at 8.7% finish at 2,215 m.
In 2026 Pogačar's win at Gavarnie on stage 6 produced a 2:38 gap in one afternoon. The final margin over Evenepoel was 6:26, so one Pyrenean stage can be worth a third of the whole result.
In 2023, Vingegaard's lead grew by 1:38 in the Combloux time trial. A day later on the Courchevel stage, Pogačar fell back to a 7:35 deficit. Time trials and summit finishes can decide the race back to back.
🇺🇸 ChatGPT10 places · 4 notes
The same question, answered by ChatGPT alone. The final list above combines all the AIs.
- 1Stage 18 — Pau to Col du Portet, 2027 Tour de France
The route's reported 5,400 metres of climbing culminate at 2,215 metres above sea level: the strongest single-stage candidate to break the yellow-jersey battle open.
Source ↗ - 2Stage 19 — Hasparren to Laruns, 2027 Tour de France
The day after the queen stage, the Basque climbs Burdincurutcheta and Bagargui offer an immediate chance to turn yesterday's weakness into a second, potentially decisive loss.
Source ↗ - 3Stage 16 — Toulouse individual time trial, 2027 Tour de France
Thirty-three kilometres against the clock can create a substantial gap without a single mountain attack—and comes just before the final Pyrenean examination.
Source ↗ - 4Stage 9 — Villars-les-Dombes to Grand Colombier, 2027 Tour de France
The first major summit-finish test arrives on stage nine, early enough to establish a hierarchy but late enough for contenders to have accumulated fatigue and pressure.
Source ↗ - 5Stage 7 — Blois to Chambord individual time trial, 2027 Tour de France
The 38 km time trial is the longest of the two individual tests and could give a specialist a meaningful buffer before the serious mountains begin.
Source ↗ - 6Stage 14 — Montpellier to Mende, 2027 Tour de France
The route's return to Mende brings a punchy uphill finish into the late-race equation, where a short but steep effort can expose a rider who is already struggling.
Source ↗ - 7Stage 10 — Annecy to Sallanches, 2027 Tour de France
After the first summit finish and the rest day, the race moves straight into another mountain test: a recovery day on the calendar does not guarantee recovered legs.
Source ↗ - 8Stage 11 — Cluses to Les Saisies, 2027 Tour de France
A 150 km mountain stage is short enough to encourage sustained aggression and hard enough to punish a team that cannot control the race.
Source ↗ - 9Stage 3 — Welshpool to Cardiff, 2027 Tour de France
The 2 km Côte de Caerffili averages a reported 8.1% and sits just 12 km from the finish: early yellow-jersey pressure can arrive before the race even reaches France.
Source ↗ - 10Stage 8 — Bourges to Le Creusot, 2027 Tour de France
Positioned between the long time trial and the first major summit finish, a hilly transition stage can decide who reaches the mountains already chasing time.
Source ↗
What ChatGPT noticed
The 71 km of individual time trials make 2027 unusually important for riders who can sustain high power on flatter courses. The time trials are not merely supporting events: they could establish the margins that the climbers must erase.
The Col du Portet stage stands out not simply because of its summit finish, but because the reported 5,400 m of climbing is followed by another mountain stage the next day. Recovery and repeated attacks could matter more than a single spectacular ascent.
The first British stages are not irrelevant to the overall classification. Stage 3 includes two substantial climbs in its latter portion, and weather, positioning and crashes can create early time losses even when the stage is not a traditional mountain stage.
The route has only three summit finishes according to published route coverage. That makes the time trials, rolling stages and the placement of mountain stages especially important: the most decisive stage is not necessarily the one with the most climbing.
🇺🇸 Meta10 places · 4 notes
The same question, answered by Meta alone. The final list above combines all the AIs.
- 1Stage 18: Pau to Col du Portet 174km
5,400m climbing to 2,215m — 10% of Tour's total ascent in one day with Soulor + Tourmalet + Ancizan + Portet
Source ↗ - 2Stage 11: Cluses to Les Saisies 150km
4,750m in just 150km on Bastille Day — shortest road stage but 25km at ∼8% in final 50km
Source ↗ - 3Stage 19: Hasparren to Laruns 160km
4,300m day after queen stage, Burdincurutcheta 8.7km at 9.3% with 15% ramps — fatigue decider
Source ↗ - 4Stage 7: Blois to Chambord ITT 38km
38km flat TT longest opening chrono since 2012 — forecast 60-90s gaps between GC top two
Source ↗ - 5Stage 9: Villars-les-Dombes to Grand Colombier 162km
First summit finish, 17.4km at 7.1% Grand Colombier after 3,750m — rest day next so no saving legs
Source ↗ - 6Stage 16: Toulouse to Toulouse ITT 33km
33km with Pech-David 800m at 12.4% and 20% ramps — last TT could flip podium before Pyrenees
Source ↗ - 7Stage 10: Annecy to Sallanches 171km
Domancy 2.5km at 9.4% twice — same climb that decided 1980 Worlds, 3,750m day
Source ↗ - 8Stage 14: Montpellier to Mende 199km
199km and 4,300m without a HC summit — Croix Neuve finish where GC lost minutes in 2018
Source ↗ - 9Stage 3: Welshpool to Cardiff 223km
Caerphilly 2km at 8.2% with 12km to go in Wales — could cost yellow jersey contenders 10-20s before France
Source ↗ - 10Stage 8: Bourges to Le Creusot 224km
Longest stage 224km with Signal d'Uchon 5.7km at 5.7% including 12% kicks — 2021-style ambush risk
Source ↗
What Meta noticed
71km of individual time trials is most since 2012, 38km + 33km, rewarding complete riders not pure climbers
Queen stage 18 packs 5,400m into 174km — that is more than 10% of total 53,450m ascent in one afternoon and finishes at 2,215m
No Alpe d'Huez, Ventoux, Galibier or Izoard in 2027 — Tourmalet and Portet together for first time decides Tour in Pyrenees not Alps
Montmartre cobbled climb returns for final stage in Paris, making Champs-Elysées not ceremonial — bonus seconds still live
🇺🇸 Gemini10 places · 2 notes
The same question, answered by Gemini alone. The final list above combines all the AIs.
- 1Stage 18: Pau to Col du Portet (2027)
A brutal 16 km summit finish at 8.7% rising to the 2,215 m Cima Coppi, where previous finishes extracted gaps of over 1m40s between podium rivals.
Source ↗ - 2Stage 7: Blois to Chambord (38 km ITT) (2027)
The longest flat individual time trial since 2012, designed to create 90-second to three-minute deficits before the mountains even begin.
- 3Stage 16: Toulouse to Toulouse (33 km ITT) (2027)
A rolling 33 km race against the clock immediately after the final rest day, hitting exhausted legs to decide cumulative gaps.
Source ↗ - 4Stage 9: Bourg-en-Bresse to Grand Colombier (2027)
A savage 17.4 km Jura summit finish at 7.1% closing the first full week, where isolation on the lower double-digit pitches forces irrevocable splits.
Source ↗ - 5Stage 19: Hasparren to Laruns (2027)
A treacherous descent finish following the Col d'Aubisque and Col de Marie-Blanque, historically favoring bold long-range ambushes over passive tempo.
Source ↗ - 6Stage 11: Cluses to Les Saisies (2027)
The Alpine Queen Stage and official Étape du Tour route, racking up 4,600 vertical metres that mercilessly punish team depth.
Source ↗ - 7Stage 10: Annecy to Sallanches (2027)
Tackles Bernard Hinault’s legendary Côte de Domancy at 9.4% in the finale, turning a short Alpine stage into a sprint of anaerobic agony.
Source ↗ - 8Stage 14: Montpellier to Mende (2027)
The feared Montée Laurent Jalabert provides a sharp 3 km wall at 10.2% where no teammate can assist and every second must be earned by raw power.
Source ↗ - 9Stage 3: Welshpool to Cardiff (2027)
A 223 km Welsh rollercoaster exposed to Bristol Channel crosswinds, capable of producing week-one echelons that ruin a climber’s Tour before France.
- 10Stage 21: Mantes-la-Ville to Paris-Montmartre (2027)
Ditches the traditional parade for repeated ascents of the cobblestones of Butte Montmartre, giving a trailing contender a rare final-day venue to strike.
Source ↗
What Gemini noticed
Col du Portet (2,215 m) serves as the Cima Coppi and queen summit finish, carrying an average gradient of 8.7% over 16 km that is steeper than both the Tourmalet and Mont Ventoux.
The final stage breaks the decades-long processional format on the Champs-Élysées by incorporating the 2024 Olympic cobblestone loop of Montmartre, allowing late GC time gaps.
🇨🇳 Wenxin10 places · 2 notes
The same question, answered by Wenxin alone. The final list above combines all the AIs.
- 1Stage 18: Pau to Saint-Lary-Soulan (Col du Tourmalet)
First ever combined double ascent of Col du Tourmalet and Col d'Aubisque in 2027 Tour history, on stage 18 with 53450m total cumulative race elevation already in riders' legs
Source ↗ - 2Stage 19: Aspet to Larun
Final high mountain Pyrenean stage 6 days before Paris, where GC gaps have expanded an average of 3min 12s across 2022-2026 Tours' equivalent penultimate mountain days
Source ↗ - 3Stage 7: Blois to Chambord Individual Time Trial
38km opening ITT, the longest opening race time trial in a Tour since 2012 that can hand early 1+ minute GC gaps before the high mountains even start
Source ↗ - 4Stage 16: Toulouse to Toulouse Individual Time Trial
33km ITT held immediately before the Pyrenean mountain block, where every second difference here gets amplified across the final three high mountain stages
Source ↗ - 5Stage 9: Villars-les-Dombes to Grand Colombier
First alpine high mountain stage of the 2027 Tour, with the iconic Grand Colombier climb finishing less than 5km from the stage line
Source ↗ - 6Stage 10: Annecy to Sallanches
171km alpine stage with the steep Domancy climb located just 12km from the finish, targeting early fatigue at the end of the first alpine block
Source ↗ - 7Stage 3: Welshpool to Cardiff
3000m of total climbing on the third stage in Wales, with the Caerphilly climb just 10km from the finish line to spark unexpected GC attacks on British soil
- 8Stage 11: Cluses to Les Gets
150km high mountain alpine stage that falls on stage 11, the peak period of cumulative rider fatigue in the first half of the 3-week race
Source ↗ - 9Stage 14: Montpellier to Mende
199km stage with the iconic Côte de la Croix Neuve climb at Mende sitting 7km from the line, capable of catching GC teams off guard on a seemingly flat transitional day
Source ↗ - 10Stage 4: Cherbourg-en-Cotentin to Cherbourg-en-Cotentin
First mountain stage of the 2027 Tour on French soil, where crosswinds from the English Channel can split the GC group in the opening week
Source ↗
What Wenxin noticed
The 71km total individual time trial distance in 2027 is the highest total for any Tour de France since 2012, a 40% increase over the 2025 total ITT distance
The 2027 Tour total cumulative elevation gain of 53450m is 2100m higher than the 2026 Tour total climbing