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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
August 2026
Aug
16
Sunday

Mudskipper Canadian SwimRun Championships

Aquathlon
Aug
21
Friday

The Last Hour

Backyard Ultra 8 km
Aug
22-23
Sa - Su

Ottawa Spartan Event Weekend

Obstacle Run 5 km 10 km 4 hr 12 hr
Aug
22
Saturday

The Devil's Key

Trail Run 17 km 33 km 67 km
Aug
22-23
Sa - Su

Timber24 Relay

Backyard Ultra 192 km
Aug
22
Saturday

GLO Toronto Night Run

5 km 10 km Half Marathon
Aug
23
Sunday

Calabogie Peaks Trail Run

Trail Run 10 km Half Marathon
September 2026
Sep
5
Saturday

The Canadian Triathlon & Run

Triathlon
Sep
5
Saturday

5 Peaks Trail Running Series: Area 8

Trail Run
Sep
12
Saturday

Camp Tri

Triathlon
Sep
12
Saturday

Tough Mudder - Toronto

Obstacle Run 5 km 15 km
Sep
12
Saturday

Haliburton Forest Trail Race

Trail Run 12 km 26 km ... 50 mi 100 mi
Sep
13
Sunday

London Spartan Event Weekend

Obstacle Run 5 km 10 km
Sep
13
Sunday

Windsor Waterfront Half Marathon

5 km Half Marathon
Sep
13
Sunday

Georgina Marathon

5 km 10 km Half Marathon Marathon
Sep
19
Saturday

Kincardine 7k Trail Challenge

Trail Run 7 km
Sep
19
Saturday

Kitchener Kids with Cancer

Trail Run 5 km 10 km
Sep
19
Saturday

Monster of Mazinaw Trail Race

Trail Run 10 km 30 km 43 km
Sep
19
Saturday

Sugarbush Shenanigans

Backyard Ultra 6 hr 12 hr 24 hr
Sep
20
Sunday

Barrelman Niagara Falls

Triathlon
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