IRONMAN Canada-Ottawa
Course breakdown, historical weather, field analysis, and pacing notes.
A still-water river-bay swim and a three-lap bridge course through Canada's capital
Ottawa, Canada · August 2, 2026
IRONMAN Canada-Ottawa is a full-distance race in Canada's capital, first held in 2025. A 3.8 km still-water swim in Britannia Bay leads to a 180 km three-lap bike that crosses the Ottawa River bridges each lap (~625 m of climbing), then a 42.2 km three-lap run on the downtown canal and parkland pathways, finishing at Major's Hill Park beside the Château Laurier. Held the first Sunday of August.
- Swim
- 3.8 km
- River
- Bike
- 179.9 km
- ↑625m · Flat
- Run
- 42.5 km
- ↑194m · Flat
- Air Temp
- 14–31°C
- Water Temp
- 21°C
- Wind
- 9 km/h
- S
Swim Course
Flat, still water in Britannia Bay
The 3.8 km single loop is in the Ottawa River at Britannia Beach — but the venue is Britannia Bay (Lac Deschênes), a wide, lake-like section with no meaningful current. Despite the river name, expect flat, still water, not the downstream assist of a Chattanooga or Augusta. Water sits around 21°C in early August, comfortably inside the 24.5°C wetsuit cutoff. Rolling start from 06:00, with a 2h20 swim cut-off from your individual start.
- Still, flat water — Britannia Bay has no meaningful current despite the river name
- ~21°C, comfortably wetsuit-legal (24.5°C cutoff)
- Single 3.8 km loop, rolling start from 06:00
- Swim cut-off 2h20 from your individual start
Bike Course
Three flat-to-rolling laps across the Ottawa River bridges
180 km over three laps through Ottawa and Gatineau, crossing the Champlain, Alexandra and Portage bridges each lap. At ~625 m of climbing it's rolling parkway and city riding — Kichi Zibi Mikan and the Sir George-Étienne Cartier Parkway — rather than sustained climbs, so it rewards steady power and aero position over surges. Fast, sheltered parkway sections are broken up by the repeated bridge approaches and urban turns. Intermediate cut-off at 120.5 km (14:55 local); the bike closes 10h30 after the last swim start.
- Three laps, ~625 m of climbing — rolling parkways, no sustained climbs
- Champlain / Alexandra / Portage bridge crossings each lap
- Sheltered parkway sections reward steady power and aero position
- Intermediate cut-off 120.5 km at 14:55; bike closure 10h30 from last swim start
Run Course
Three-lap downtown marathon on canal and farm pathways
42.2 km over three laps on Ottawa's downtown pathways — the Queen Elizabeth Driveway along the Rideau Canal, then the Central Experimental Farm and Dominion Arboretum — finishing at Major's Hill Park beside the Château Laurier. Gently rolling at ~194 m of total gain, with aid roughly every 1.8 km. The three-lap format keeps you in the crowd-lined core and gives frequent, evenly-spaced pacing checkpoints.
- Three laps, ~194 m gain — gently rolling pathways
- Aid roughly every 1.8 km
- Canal, Experimental Farm and Arboretum; finish at Major's Hill Park
- 17-hour overall cut-off from the last swim start
Race Day Conditions
Warm, sometimes hot early-August racing
Early August in Ottawa is warm and can be genuinely hot: race-day temperatures across 2022–2025 have ranged 13.8–30.8°C, averaging ~23°C, and the hot, hazy 2025 debut produced a 13:05 median finish. Wind is usually light (~9 km/h, often southerly). Plan bike and run fuelling for afternoon heat on the exposed parkway and pathway sections — the forecast can shift, so check race week.
Race Field Insights
How the Field Performs
Aggregated from 1,899 finishers (2025)
- Total Starters
- 2,051
- Finishers
- 1,899
- DNF Rate
- 7.3%
- Years of Data
- 2025
- Median Finish
- 13h 05m
Finish Time Distribution
How the Median Finisher Spends Race Day
What Each Pace Looks Like
Fast | Solid | Median | Back of Pack | Slow (P90) | |
|---|---|---|---|---|---|
| Swim | 1h 10m | 1h 16m | 1h 25m | 1h 35m | 1h 45m |
| Bike | 5h 13m | 5h 38m | 6h 08m | 6h 42m | 7h 10m |
| Run | 3h 57m | 4h 28m | 5h 09m | 5h 56m | 6h 38m |
| Finish | 10h 47m | 11h 45m | 13h 05m | 14h 28m | 15h 42m |
Related reading
Race Day Weather and What It's Really Doing to Your Pacing Plan
Performance starts dropping over 22°C and humidity makes it worse. How heat compounds across the bike and run — and why the bike hides it.
Read postYour Race Plan Isn't Generic — Why Course Intelligence Changes Everything
Same FTP on two different courses produces two completely different races. Elevation, wind, and shelter change what every watt is worth.
Read postWhy Most Triathletes Blow Up on the Run (And It Has Nothing to Do with Running)
The run didn't break because you ran too hard. Swim debt, bike fatigue, and compounding decisions determine your marathon before you start it.
Read postPlan IRONMAN Canada-Ottawa with Keiro
Get a complete pacing strategy for every discipline — built from this course, forecast weather, and your fitness.
Independent analysis. KeiroLabs is not the event organizer and is not affiliated with the race organizer.