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Triathlon Calendar near Oak Brook 2025-2026

Explore the top triathlons near Oak Brook for 2025-2026! We've gathered 186 exciting races in the area. Check out our detailed list below to find your next local race.

April 2026
Apr
26
Sunday

Ravenswood Run

5 km
Apr
26
Sunday

Good Life Race

5 km
May 2026
May
2
Saturday

Fight Hunger 10K

5 km 10 km
May
3
Sunday

Chicagoland Spring Marathon

10 km Half Marathon Marathon
May
9
Saturday

Mother's Day Run/Walk - St. Charles

5 km
May
9
Saturday

F^3 Cap Sauers Trail Marathon

Trail Run
May
9
Saturday

Quarryman Challenge

5 km 10 mi
May
9
Saturday

Pink 5k

5 km
May
10
Sunday

Barrington Mother's Day 5K

5 km
May
16
Saturday

Chicago 11 Hour Endurance Run

Backyard Ultra 4 mi
May
16
Saturday

Ducky Dash

5 km
May
17
Sunday

Chicago Spring Half Marathon

5 km Half Marathon
May
31
Sunday

North Shore Classic

5 km Half Marathon
May
31
Sunday

George W. Buck Boys & Girls Club of Joliet 5K Run/Walk

5 km
June 2026
Jun
7
Sunday

Leon's Triathlon

Triathlon
Jun
20
Saturday

1911 Initiative 5k Scholarship Run/Walk

5 km
Jun
20
Saturday

Love's Fox Trot 5K

5 km
Jun
27
Saturday

Miles for Maddog

5 km 10 km
Jun
27
Saturday

Run the Runway - Wheeling

5 km
July 2026
Jul
4
Saturday

Warrenville Park District Firecracker 5K

5 km
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