Tamarack Ottawa Race Weekend takes place on Sat, May 29, 2027 in Ottawa, Canada. The main route is 42.2 km.
- Date
- Sat, May 29, 2027
- Start
- Ottawa 🇨🇦
- Distance
- 42.2 km
- Level
- Mixed field
Tamarack Ottawa Race Weekend is Canada’s largest running and walking festival featuring six events, including a World Athletics label marathon and the Canadian 10K Championships.
Official event pageWhat this race demands
The Tamarack Ottawa Race Weekend marathon demands sustained aerobic endurance over a standard 42.2 km distance in late spring conditions.
Aerobic Endurance
Covering the full 42.2 km marathon distance requires significant cardiovascular capacity and muscular stamina to sustain forward progress over hours of continuous running.
Late Spring Heat Management
Taking place on May 29 in Ottawa, athletes must prepare for potential warm late spring temperatures which increase metabolic and thermoregulatory stress.
Impact Durability
Running a full marathon distance places high repetitive impact loads on the lower limbs, requiring structural resilience to maintain form in the later kilometers.
A marathon duration typically exceeds 2.5 hours, requiring a steady intake of 60 to 90 grams of carbohydrates per hour to maintain glycogen stores and performance.
What would it take you?
Pick the level closest to yours for an estimate of finish time on this course and the training a solid preparation needs.
Estimated finish
3:45–4:30
Peak-week training
5–7 h/week
A model estimate from distance, climbing and level, not a promise. Conditions, drafting and pacing move it.
IntervalCoach turns those weekly hours into a concrete plan built around your actual fitness. Start with this race as your goal
Your road to race day
Race day at Tamarack Ottawa Race Weekend is 40 weeks away. This is how a coach divides that time. The first phase starts now.
01Base28 weeks · Aug 23, 2026 – Mar 6, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Mar 7, 2027 – Apr 17, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Apr 18, 2027 – May 8, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · May 9, 2027 – May 22, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · May 23, 2027 – May 29, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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