Tamarack Ottawa Race Weekend

Tamarack Ottawa Race Weekend 2026 Course Analysis

Tamarack Ottawa Race Weekend is a full marathon held in Ottawa, Canada, scheduled for Saturday 15 August 2026. The course is run on trail surface with 99m of total elevation gain, reaching a maximum altitude of 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 elevation gain across the full distance. The course ranges from 47m to 71m above sea level — a 24m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Surface Type: Trail

Tamarack Ottawa Race Weekend is a trail race, meaning the course includes unpaved surfaces such as dirt, gravel, or forest paths. Trail surfaces are inherently slower than road courses due to uneven footing, technical sections, and often steeper gradients. Trail-specific shoes with good grip are recommended, and runners should expect a finish time 10-20% slower than their equivalent road marathon time.

How Difficult Is Tamarack Ottawa Race Weekend?

Our difficulty rating for Tamarack Ottawa Race Weekend is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

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.