Illinois Triathlon Calendar 2025-2026

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Explore the best triathlons in Illinois for 2025-2026! Our updated list features 253 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

December 2025
Dec
13
Saturday

The Best Races - Evanston

5 km 10 km 13 mi
Dec
27
Saturday

The Best Races - Chicago

5 km 10 km 13 mi
January 2026
Jan
1
Thursday

Resolution Run - Olympia Fields

6 km
Jan
1
Thursday

Cheers to New Year's 5k

5 km
Jan
10
Saturday

Frozen Gnome

Trail Run 10 km 50 km
Jan
31
Saturday

F3 Lake Half Marathon

5 km 13 mi
February 2026
Feb
28
Saturday

YMCA Dry Tri

Triathlon
March 2026
Mar
14
Saturday

Muddy Shamrock @ The Forge

Trail Run 6 mi 13 mi
Mar
15
Sunday

Lucky 7K

7 km
Mar
21
Saturday

Skunk Ape 806/314 Trail Race

Trail Run 14 min
Mar
21-22
Sa - Su

American Bottoms 100

55 mi 110 mi
Mar
28
Saturday

Footsteps for Families 5k

5 km
Mar
28
Saturday

Rend Lake Marathon

10 km 13 mi 26 mi
Mar
28
Saturday

Schon Park 9 Endurance Run

Backyard Ultra 3 hr 6 hr 9 hr
April 2026
Apr
11
Saturday

Lincoln Presidential Half Marathon

13 mi
Apr
18
Saturday

Chicken Run

5 km 10 km
Apr
18
Saturday

Earth Day 50k

Trail Run 5 mi 15 mi 50 km
Apr
18
Saturday

PRC Pinwheel 5K Run

5 km
Apr
23-25
Th - Sa

Illinois Race Weekend

5 km 10 km 21 km 42 km
Apr
25
Saturday

Childish Nonsense

Trail Run 10 km 25 km 50 km 50 mi
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