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Triathlon Calendar near Oak Brook 2025-2026

Explore the top triathlons near Oak Brook for 2025-2026! We've gathered 76 exciting races in the area. Check out our detailed list below to find your next local race.

July 2025
Jul
6
Sunday

All American 8 Mile - Greater Chicago

4 mi 8 mi
Jul
19
Saturday

Run for the Dogs 5k

5 km
Jul
19
Saturday

Christmas in July Half Marathon

5 km 13 mi
Jul
26
Saturday

Stan's Donut Race

5 km 10 km
August 2025
Aug
2
Saturday

Dim Sum and Then Some: The Uptown 10K

5 km 10 km
Aug
6
Wednesday

SSW Running Club Club Challenge

5 km
Aug
10
Sunday

Summer Sizzler - Greater Chicago

5 km 10 km 15 km
Aug
16
Saturday

The Forge Gravel Triathlon

Triathlon
Aug
17
Sunday

Alpine Races 10 Mile

10 mi
Aug
23
Saturday

Parkie’s 5K

5 km
September 2025
Sep
1
Monday

Water for Life 5k

5 km
Sep
6
Saturday

The Hidden Gem Half Marathon

13 mi
Sep
6
Saturday

Last Chance BQ.2 Marathon

26 mi
Sep
6
Saturday

Naperville Trails Half Marathon

Trail Run 10 km 13 mi
Sep
13
Saturday

Monster 5K Run/Walk

3 km 5 km
Sep
13
Saturday

Friends of the Poor Walk and Run

Sep
14
Sunday

Timely Nonsense - Chicago, IL

Backyard Ultra 6 hr 12 hr
Sep
14
Sunday

El Grito Family Run/Walk

5 km
Sep
21
Sunday

St. Veronica 6k Run/Walk for Scholarships

6 km
Sep
21
Sunday

Fox Valley Marathon Races

5 km 13 mi 20 mi 26 mi
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