Tamarack Ottawa Race Weekend
Ottawa, Canada · Sunday 15 August 2027
The Tamarack Ottawa International Marathon takes place in August 2026 across a flat to gently rolling trail course that covers 42.2 kilometers through Ottawa, Canada. The terrain is forgiving for a trail marathon, with minimal elevation change that won't punish your legs on race day. Beyond the race itself, the event offers a full weekend experience including a 10K, half marathon, and various shorter distances, plus recovery zones, an expo, and a beer garden if you're looking to celebrate after finishing. Medical services and safety support are in place throughout the event, and you can download the official app to help with logistics and training prep. This is a well-organized event backed by sponsors like Desjardins and Otto's, so you can expect solid infrastructure and support stations along the way.
Difficulty Calculator
h
:m
:s
Adjusted Time
4:00:15
Time difference: +0.3 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain99m
Elevation High71m
Elevation Low47m
Weather Forecast
High23°C
Low12°C
Chance of Rain0%
How hard is Tamarack Ottawa Race Weekend?
Moderateharder than 41% of marathons
Flattest / easiestHardest
On our difficulty model, Tamarack Ottawa Race Weekend plays about 4 minutes slower than an average road marathon for a 3:30 runner. It ranks #681 hardest of 1150 marathons we analyse, and #18 of 51 in Canada. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Tamarack Ottawa Race Weekend?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Tamarack Ottawa Race Weekend | Difference |
|---|---|---|
| 3:00:00 | 2:58:34 | −01:26 |
| 3:30:00 | 3:29:23 | −00:37 |
| 4:00:00 | 4:00:15 | +00:15 |
| 4:30:00 | 4:31:10 | +01:10 |
| 5:00:00 | 5:02:07 | +02:07 |
| 5:30:00 | 5:33:06 | +03:06 |
| 6:00:00 | 6:04:08 | +04:08 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Tamarack Ottawa Race Weekend 2027 Course Analysis
Tamarack Ottawa Race Weekend is a full marathon held in Ottawa, Canada. It is scheduled for Sunday 15 August 2027. The course is run on road surface with 99m of total climbing, with its high point near 71m above sea level. For registration and full race details, visit the official Tamarack Ottawa Race Weekend website.
Elevation Profile
This is a very flat course, with only 99m of total climbing and little change in altitude throughout. Flat profiles let you hold an even pace from start to finish, which makes this a fast, PB-friendly race.
Expected Race Day Weather
Based on historical weather data for August, the expected race day conditions are as follows. Moderate temperatures between 12°C and 23°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance on race day. There is a low chance of rain (0%), so dry conditions are likely.
Surface Type: Road
Tamarack Ottawa Race Weekend is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare Tamarack Ottawa Race Weekend against other marathons to find the right race for your goals.
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If Tamarack Ottawa Race Weekend fits your goal, these courses play out about the same on our difficulty model.
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