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Running Calendar Ontario 2025-2026

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Explore the best running races in Ontario for 2025-2026! Our updated list features 179 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons
July 2026
Jul
11
Saturday

The 5K Foam Fest - Kitchener, ON

Obstacle Run 5 km
Jul
11
Saturday

Dark & Dirty

Trail Run 7 km 14 km
Jul
11
Saturday

Summit 700 Trail Runs

Trail Run 5 km 10 km Half Marathon 50 km
Jul
13
Monday

The ENDURrun Prelim

Trail Run 3 km 5 mi 10 km Half Marathon
Jul
18-19
Sa - Su

Bluewater Triathlon

Triathlon
Jul
18
Saturday

The 5K Foam Fest - Wasaga Beach, ON

Obstacle Run 5 km
Jul
18-19
Sa - Su

Xterra Conquer the Crater

Trail Run 3 km 5 km ... Half Marathon Marathon
Jul
18
Saturday

5 Peaks Trail Running Series: Albion Hills

Trail Run
Jul
24
Friday

One More Hour

Backyard Ultra 6 km
Jul
25
Saturday

Mud Hero Ottowa

Obstacle Run 6 km
Jul
25
Saturday

Toronto Carnival Run

5 km 10 km
Jul
25
Saturday

The 5K Foam Fest - London, ON

Obstacle Run 5 km
Jul
25
Saturday

Tally in the Valley Trail Race

Trail Run 7 km Half Marathon ... 100 mi 24 hr
Jul
26
Sunday

10KTO

10 km
August 2026
Aug
1
Saturday

Persistence Backyard Ultra

Backyard Ultra 7 km
Aug
2
Sunday

IRONMAN Canada-Ottawa

Triathlon
Aug
8
Saturday

Falling Water Trail Marathon

Trail Run Half Marathon Marathon
Aug
9
Sunday

The ENDURrun

Trail Run 10 km 15 km ... 30 km Marathon
Aug
9
Sunday

Thousand Islands Triathlon & Runs

Triathlon 5 km 10 km 20 km 40 km
Aug
9
Sunday

Xterra Sleeping Giant

Trail Run
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