Tartan Ottawa International Marathon
Ottawa, Canada · Sunday 13 June 2027
The Tartan Ottawa International Marathon takes runners through Canada's capital city in June, a time when Ottawa comes alive with summer energy. The race is part of the larger Tamarack Ottawa Race Weekend, a major running festival that draws participants from across the region. The event benefits from the city's well-developed infrastructure and community support, with medical services, volunteer support, and recovery zones integrated throughout the weekend experience. The course itself is a trail marathon that stays relatively flat with gentle rolling sections, making it approachable for most fitness levels without being boring. Runners will spend the day on trail terrain, which adds a different feel from road marathons and requires slightly more attention to footwork. The elevation profile is modest, ranging between roughly 50 and 85 meters above sea level across the full distance, so you won't face any serious climbs. What you should expect is a steady, runnable day where the terrain is the main variable to manage rather than dramatic elevation changes.
Difficulty Calculator
h
:m
:s
Adjusted Time
4:11:13
Time difference: +11.2 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain188m
Elevation High85m
Elevation Low49m
Weather Forecast
High28°C
Low16°C
Chance of Rain13%
How hard is Tartan Ottawa International Marathon?
Difficultharder than 70% of marathons
Flattest / easiestHardest
On our difficulty model, Tartan Ottawa International Marathon plays about 13 minutes slower than an average road marathon for a 3:30 runner. It ranks #348 hardest of 1150 marathons we analyse, and #5 of 51 in Canada. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Tartan Ottawa International Marathon?
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 Tartan Ottawa International Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:05:10 | +05:10 |
| 3:30:00 | 3:38:04 | +08:04 |
| 4:00:00 | 4:11:13 | +11:13 |
| 4:30:00 | 4:44:36 | +14:36 |
| 5:00:00 | 5:18:12 | +18:12 |
| 5:30:00 | 5:52:01 | +22:01 |
| 6:00:00 | 6:26:00 | +26:00 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Tartan Ottawa International Marathon 2027 Course Analysis
Tartan Ottawa International Marathon is a full marathon held in Ottawa, Canada. It is scheduled for Sunday 13 June 2027. The course is run on road surface with 188m of total climbing, with its high point near 85m above sea level. For registration and full race details, visit the official Tartan Ottawa International Marathon website.
Elevation Profile
With 188m of total climbing, this is a gently undulating course. The elevation changes are manageable for most runners and shouldn't greatly affect your pacing.
Expected Race Day Weather
Based on historical weather data for June, the expected race day conditions are as follows. Moderate temperatures between 16°C and 28°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 (13%), so dry conditions are likely.
Surface Type: Road
Tartan Ottawa International Marathon 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 Tartan Ottawa International Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If Tartan Ottawa International Marathon fits your goal, these courses play out about the same on our difficulty model.
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