70.3 · 20 June 2027 · Quebec
Ironman 70.3 Mont-Tremblant 2027
IRONMAN 70.3 Mont-Tremblant takes place on June 20, 2027 in the Laurentians, Quebec. One-loop swim in Lac Tremblant, with clear, cold water (organizer data: 17 °C, wetsuit almost a certainty). 90 km bike on closed roads with few turns: a fast stretch on Route 117, exposed to the wind, and real climbing in the final section with Chemin Duplessis. The 21.1 km run is an out-and-back, rolling and mostly shaded, finishing in the village. Typical weather: highs around 23 °C, cool mornings. The times shown in the tables are our rough estimates, not official data.
Course
Three legs, three different races
Indicative profile · Scheda automatica da fonti pubbliche (2026-11): da rivedere. The organiser publishes the final course in spring: this page updates.
Swim1.9 km
- One 1.9 km loop in Lac Tremblant, starting from the beach at the Beach and Tennis Club.
- Fresh, clear and generally calm water: the surrounding mountains shelter the lake from chop.
- Cold: 17 °C on average according to the organizer, around 18 °C in June race reports. Wetsuit is practically a given — bring it and test it beforehand.
- Cool mornings: warm up properly before the start and consider a neoprene cap if you're sensitive to cold.
- From the swim exit to T1 it's about a 400-500 m flat walk on pavement (parking lot).
Bike90 km · 1,013 m D+
- One 90 km loop on closed roads, few turns, official elevation gain of 1,013 m (age-grouper sources report higher figures, likely inflated by GPS).
- Route 117: roughly 12 miles out and 12 back, excellent tarmac but it's where you'll find the wind. Stay aero and don't burn watts.
- Montée Ryan: a climb of about 2 km at 5% average, very rideable.
- The final section is the key: Chemin Duplessis with gradients up to 8%, descents hitting 60 km/h and, in the last ~20 km, short steep ramps at 10-12%. Keep something in reserve for this stretch.
- A 2024 finisher confirms it: the last climb on the Duplessis is tough — pace yourself from the start.
Run21.1 km
- A 21.1 km out-and-back, one loop, 128 m of elevation gain, rolling and mostly shaded.
- Right after transition there's a steep ramp (about 8%, 150-200 m) followed by a sharp descent: don't go out hard.
- A section on the paved Le Petit Train du Nord trail, slightly downhill on the way out: a good place to find your rhythm.
- A short gravel/dirt section (less than 1 km) with soft footing: watch your foot placement.
- Uphill finish toward the ski village: save something for the last few kilometers.
Which athlete it takes
| Goal | Swim | Bike | Run | Total |
|---|---|---|---|---|
| Comfortable finisher | 0:48 | 3:25 | 2:25 | 6:50 |
| Mid-pack goal | 0:40 | 3:00 | 2:05 | 5:55 |
| Fast goal | 0:34 | 2:40 | 1:45 | 5:05 |
| Top age-group | 0:29 | 2:25 | 1:30 | 4:30 |
Indicative splits from recent editions' results, transitions included. The personal forecast, below, compares them with your data.
What the course asks
Stories from the race
The best of the race
A selection of the most watched videos and the most popular photos. The full galleries are at the bottom of the page.
Reviews
Who raced it, what they say
At launch, pages start from syntheses of public race reports, declared as such. Verified reviews come from athletes who receive the invite within 7 days of the race, with the activity recorded on their device.
Structured fields: finish and leg times from your device, wetsuit yes/no, gear, perceived temperature, what you'd do again and what not, «I'd race it again». Free text is the race report. The linked activity makes it verified without exposing personal data.
The form appears here after the race, for those who connected a device or appear in the official results.
Is the swim wetsuit-legal? Yes, effectively always: the organizer lists an average water temperature of 17 °C in June, and recent reports mention around 18 °C. Bring it without question and test it in cold water before the race. How hard is the bike leg? 1,013 m of official climbing over 90 km, concentrated at the end: Chemin Duplessis with gradients up to 8% and short 10-12% ramps in the last ~20 km. The rest is fast-rolling, with Route 117 quick but exposed to the wind. Why do GPS files show more climbing than the official figure? Shared files go up to 1,667 m, but the official course page lists 1,013 m (3,325 ft). GPS units tend to over-read on short, steep ramps. Plan on the official number. Is the run flat? No. 128 m of elevation gain: a steep ramp (~8%) right after T2, continuous rollers, a short gravel section and an uphill finish in the village. On the upside, it's mostly shaded. What are the cutoff times? From 2019 data: swim 1h10, bike within 5h30 total time with intermediate cutoffs at Labelle (km 52 and 71.8), race cutoff 8h30. Check the 2027 athlete guide — these can change. What's the weather like in June? Organizer data: highs around 23 °C, lows around 12 °C, water at 17 °C. Cool mornings and mild days, but recent reports also mention wind and heat as possible variables. What's the swim-to-T1 transition like? From the swim exit to T1 it's about a 400-500 m flat walk on pavement (a parking lot). Budget for a longer transition than usual and decide in advance how you'll handle your wetsuit. Is the bike course on open roads? No, the 90 km loop is on closed roads with few turns. Route 117's tarmac is reported as very good in race reports. Is there bike support in the area? Yes: CyberCycle about 5 km from the resort (near the Hotel Mont Tremblant) for proper mechanical support, and Boutique Explore inside the resort for essentials. How do I get to the start on race morning? In 2019 shuttles ran from 5:00 a.m. Confirm times and pickup points in the 2027 athlete guide; for official questions: monttremblant70.3@ironman.com.
The Q&A is fed by reviews and the rulebook: every answer says where it comes from.
Preparation tips
What to do from today to race day
Fit a generous cassette for the 10-12% ramps at the end: spinning beats grinding late in the ride.
Do at least a couple of cold open-water swims in your wetsuit in the weeks before. 17 °C water catches out anyone who isn't used to it.
The ramp out of T2 comes after ~400 m: walk-run it if needed — you'll make the time back on the downhill Petit Train du Nord.
If you arrive a few days early, ride Montée Ryan and Chemin Duplessis: knowing where the ramps hit changes how you manage the race.
Shared files show up to 1,667 m of climbing, but the official figure is 1,013 m. Plan on the official number, expect sharp ramps.
Check-in and village
Registration, briefing and bike check-in at Quartier Tremblant / IRONMAN Village, Friday and Saturday. Shuttles from 5:00 a.m. on race morning (2019 data, check the current athlete guide).
T1 transition
T1 is in a parking lot about 400-500 m from the swim exit, a flat walk on pavement.
Accommodation
Hotels near the resort (Westin, Holiday Inn, Marriott and others): book well in advance, availability goes fast.
Bike support
CyberCycle about 5 km away (near the Hotel Mont Tremblant); Boutique Explore in the resort sells the essentials.
Race organization contact
Official email: monttremblant70.3@ironman.com.
Guides and deep dives
Everything you need before you register
One article per topic, written from the sources listed at the bottom of the page and updated every edition. AI syntheses are declared as such.
Race Day at Mont-Tremblant: Timeline, Common Mistakes, Plan B
From the 5:00 AM shuttles to the uphill finish in the village: how to build your day, what most athletes get wrong, and what to do if things go sideways.
Logistics · 4 min · AI synthesisMont-Tremblant logistics: where to stay, where to register, how to get around
Village in Quartier Tremblant, T1 400-500 m from the swim exit, hotels that sell out fast: the checklist so you don't wing it.
Run · 4 min · AI synthesisThe Mont-Tremblant Half-Marathon Run: Steep Ramp Early, Rhythm Later, Climb at the End
A 21.1 km out-and-back with 128 m of elevation gain, plenty of shade, a gravel section and an uphill finish in the village: how not to get caught out.
Bike · 4 min · AI synthesisThe Mont-Tremblant 70.3 Bike: Fast on the 117, Brutal at the End
90 km on fully closed roads with 1,013 m of climbing: the course tempts you to push early, but the bill comes due on Chemin Duplessis in the final 20 km.
Gear
What age groupers ride and what this course asks for
At Kona, age group average
Latest Kona bike count (2026): about ≈2,260 age-group bikes, pros excluded. Shares of bikes counted.
World Championship athletes are qualified and more performance-oriented than the average field here. Source: Slowtwitch, compiled with volunteers and IRONMAN access. Slowtwitch
Wheels for this course
A rule of thumb from this course: 11.3 m of climbing per km and moderate wind exposure. It is guidance, not a count. (hilly)
Front wheel
35-55 mm deep
Rear wheel
50-60 mm. Use a disc only if the descents are not technical and the weather is stable
Tyres
28-30 mm, tubeless if possible. Choose pressure by weight and road surface, not by habit.
Check the weather and the wind forecast on race week: on windy days, drop a depth step on the front wheel.
Race kit
Fuel and pack, nothing forgotten
Work out carbs, fluid and sodium for this course, split into bottles, gels and bars, then tick off everything to pack from passport to Vaseline.
Start at 60 g/h if you have not trained your gut, 80-90 if you have. Never try new products on race day.
Before the race
Carb load
560-700 g carbs per day for the last 1 day(s)
Breakfast, 3 h before
70-140 g carbs, low fibre, familiar food
On the bike 3:00
Every 20 min · 23 g carbs and about 200 ml
On the run 2:05
Every 20 min · 17 g carbs and about 167 ml
Whole race
After the finish
70-84 g carbs and about 21 g protein within the first hour
General guidance for healthy adults, not medical advice. Adjust with your coach or dietitian and rehearse it in long sessions.
Sources
Where what you read comes from
Race reports, blogs, videos and threads that tell Mont-Tremblant. Linked, never copied: they feed the syntheses, the FAQ and the Q&A.
Your plan for Ironman 70.3 Mont-Tremblant
Connect what you have, the course does the rest
First today's form and the forecast for the three legs, then a preview of the week built on the Mont-Tremblant segments and your routes. The account comes after, if it convinces you. Until 31 December 2026 everything is free: we're in alpha.