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Race IntelligenceOttawa, Ontario, Canada

IRONMAN Canada-Ottawa

Know your day before you race it.

Enter four numbers you already train with. You get a likely finish range, target paces and watts, and how I would race this course.

Race day
8 August 2027
Swim
3.8 km
Bike
180 km
Run
42.2 km

Published route evidence. Final 2027 route pending. Checked 17 Sept 2026.

01 Race Card

Build my Race Card

Your first range uses conservative assumptions. Add optional evidence to make it more specific. It is calculated in your browser and saved only on this device.

Your numbers
Distance unit
Weight unit
You and this race
Sharpen your range with more detailOptional. Recent swim, bike and run results, equipment and transitions.

Add only the evidence you have. Every control changes a discipline range, its uncertainty, or an execution-risk explanation.

Swim evidence

Replaces the broad pool-to-open-water assumption.

Bike and equipment

These replace broad mass, aerodynamics, tyre, and power-to-speed assumptions.

Run evidence

A recent effort and honest durability/acclimation answers refine the post-bike run.

Race execution

Transition proficiency changes the T1/T2 range and how wet conditions are treated.

02 The course

What Canada-Ottawa actually gives you

You swim one loop in the Ottawa River from Britannia Park, then ride 2.75 loops on fully closed roads past Parliament Hill and the Supreme Court and out into quieter countryside, then run a flat marathon through downtown Ottawa to finish at Major's Hill Park beside the Parliament of Canada. Closed roads and mild elevation make this a fast day. The unusual thing to plan for is the bike's 2.75 loops, which is just irregular enough to catch people out.

Show distances in

Swim

3.8 km

River, Single Loop

Layout
1 loop
Setting
the Ottawa River, from Britannia Park

A single-loop river swim from Britannia Park, straightforward enough that the main thing it asks is a sensible early effort.

Source: 2027 current route

Bike

180 km

Rolling Closed Roads, City and Outskirts

Layout
2.75 loops, fully closed roads
Setting
Parliament Hill, the Supreme Court of Canada, the Ottawa River and quieter countryside

A fully closed 2.75-loop course with mild elevation changes, where the uneven loop count makes it easy to misjudge how much is left.

Source: 2027 current route

Run

42.2 km

Flat City Streets

Setting
downtown Ottawa, finishing at Major's Hill Park beside the Parliament of Canada

A flat run through downtown Ottawa, which gives nothing back to a bike that was over-ridden.

Source: 2027 current route
Where these course facts come from

These facts come from the organiser’s latest published material: swim, 2027 current route; bike, 2027 current route; run, 2027 current route. They describe the character of the course. They do not confirm the final 2027 route.

03 Race plan

How I’d want you to race it

One job for each part of this course. The distance markers tell you when the job changes. The course tells you why.

Swim

One loop, and a shuttle morning

  1. 0–3800 m

    One loop of the Ottawa River

    Settle early after an early shuttle

    A single-loop river swim from Britannia Park, reached by shuttle from downtown in the dark. After a broken morning, the priority is getting into a rhythm rather than racing the first few hundred metres.

    • Settle by 400 m
    • Swim your own effort off the start

Bike

Two and three quarter loops

  1. 0 km–60 km

    Loop one through the city

    Closed roads are not a reason to ride harder

    The course runs fully closed past Parliament Hill, the Supreme Court and the river. Smooth, traffic-free road at speed is where a slightly high number feels completely sustainable. Fix the ceiling here.

    • Cap power in the first 30 minutes
    • Start fuelling early

  2. 60 km–120 km

    Loop two, out into the countryside

    Mild elevation still adds up over 180 km

    The route leaves the landmarks for quieter open landscape. The organiser calls the elevation changes mild, which is true per rise and misleading over three passes.

    • Hold power over the rises
    • Compare loop two to loop one

  3. 120 km–180 km

    The final three-quarter loop

    Count the course, not the laps

    This is a 2.75-loop course, so the last pass is a partial one and does not finish where the others did. Know that in advance rather than discovering it at 150 km when you expected to be nearly home.

    • Ride to distance, not to landmarks
    • Finish nutrition before T2

Run

Flat streets, no excuses

  1. 0 km–14 km

    Into downtown Ottawa

    Flat means you have to hold yourself back

    The marathon is flat through a busy downtown with heavy support. Nothing in the terrain will slow you down, so the first few kilometres have to be a decision.

    • Hold opening pace for 5 km
    • Shorten stride out of T2

  2. 14 km–28 km

    Through the city

    The middle is where the bike shows up

    On a flat course, the halfway point gives an honest read on whether the closed-road bike was ridden sensibly. Adjust here rather than at 35 km.

    • Reassess pace honestly at halfway
    • Take aid on schedule

  3. 28 km–42.2 km

    To Major's Hill Park

    Spend what a disciplined bike left

    The finish is at Major's Hill Park beside the Château Laurier and the Parliament of Canada. On flat ground, whatever the bike did not take is still available here.

    • Decide the finish honestly
    • Run the last kilometres on effort

04 Race week

What I would keep an eye on

There is no useful 2027 forecast this far out. For now, past race dates give us a point of reference. Closer to the race, the forecast will tell us whether the plan needs changing.

Forecast statusToo early for a forecast

A race-day forecast is not meaningful yet; check back closer to the event.

Temperature
17.0–28.1°CDew point centred on 15.8°C
Wind and gusts
9.0 km/hGusts up to 34.9 km/hPrevailing direction W
Rain likelihood
Up to 85%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-17.Historical comparison only. This is not a forecast for 2027.

05 Method

What goes into your range

Your CSS, FTP, weight and run threshold create the first range. Open-water, bike, run and execution evidence can replace broad assumptions. Course data and the historical conditions baseline shape every simulation.

  1. Your numbersCSS · FTP · weight · run threshold
  2. This raceDistance · water type · elevation · exposure
  3. Your Race CardFinish and discipline ranges, with target paces and watts

Confidence is built from four inputs

Athlete evidence
Builds with recent open-water, bike and run efforts
Bike setup
Builds with equipment, mass, aero and tyre detail
Course evidence
Partial while the 2027 route is unconfirmed
Race-week conditions
Historical baseline until a forecast is useful
How the model works

It starts with the targets in your Race Card, then samples the parts of a full distance that vary: open-water pace, transitions, bike speed at the planned power, and the drop in run performance after the swim and bike. Repeating that calculation produces a likely range rather than a single heroic number.

The current time calculation uses this race’s published distances, or standard full distance distances where none are published, with the available course headings, elevation and exposure evidence. Weather scenarios vary temperature, dew point, wind, gusts, rain and water conditions together. Unknown route detail stays visible as uncertainty rather than false precision.

It is not predicting your exact finishing time, placing, or race-day weather. It answers a narrower question: given the plan and the information we have, what range of day is plausible, and where is the uncertainty coming from?

Confidence is not a permanent “low”. It is recalculated across four separate inputs:

  • Your evidence: consistent inputs and recent race-like swim, bike, and run results.
  • Bike setup: measured or specified aerodynamics rather than a broad prior.
  • The course: verified distance and route character, including elevation and technical sections.
  • The conditions: a current forecast is more useful than a historical comparison.

It starts low when those inputs are broad. It can become moderate or high as the evidence improves. A narrower range means better information, not a guarantee.

06 Next steps

If Canada-Ottawa is your race

Your range is built on today’s numbers. The months of training before race day decide what those numbers become.

The work from here.

Self-guided routeFull-distance training plansTraining plans for the pacing discipline this course rewards.See the plans Personalised routeWork with me on the whole buildCoaching when you want the plan, feedback and race decisions joined up.See coaching

Further reading

ArticleFull-distance race strategy: calm execution beats chaosThe pacing discipline a fast, closed-road bike course demands.ArticleFix the first ten minutes off the bikeUseful before a flat downtown marathon that starts right after a fast bike.

Evidence

Sources and verification

Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2027 route is not yet confirmed. Last checked 2026-09-17.