Triathlon Calendar United States 2025-2026

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Explore the best triathlons in the United States for 2025-2026! Our updated list features 8410 exciting races across the country. Find your next race in the United States below and join the running community at these great events!

May 2026
May
23-24
Sa - Su

Tough Mudder - Philly

Obstacle Run 5 km 15 km
May
23
Saturday

Run for Briggs 5K

5 km
May
23-25
Sa - Su

Crown Of The Crest

Trail Run 13 mi 26 mi 100 mi
May
23
Saturday

Leavenworth Trail Fest

Trail Run 5 km 27 km 55 km
May
23
Saturday

Sugar Badger 50 Miles

Trail Run 13 mi 50 km 50 mi
May
23-25
Sa - Su

Back 9 Endurance Run

Backyard Ultra 3 mi 12 hr 24 hr
May
24
Sunday

YIJE 5K Run/Walk

5 km
May
24
Sunday

Sweat, Swat ‘n Swear

Trail Run 10 mi 25 km 50 km
May
24
Sunday

Long Beach City Manager's 10 Mile

10 mi
May
24
Sunday

Badass Texas Half-Marathon

5 km 10 km 13 mi
May
25
Monday

5 For The Fallen

5 mi
May
30-31
Sa - Su

Monterey Spartan Event Weekend

Obstacle Run 5 km 10 km
May
30-31
Sa - Su

Colorado Springs Spartan Trifecta Weekend

Obstacle Run 5 km 10 km 21 km 50 km
May
30
Saturday

Lake to Ocean 100K

Trail Run 100 km
May
30
Saturday

Sonoma Coast Trail Runs

Trail Run 13 mi 30 km 26 mi 50 km
May
30
Saturday

Elsa Chicken Plucker Backyard Ultra

Backyard Ultra 4 mi
May
30
Saturday

Bronx CB6 5K Run/Walk for Diabetes Awareness

5 km
May
31
Sunday

Toro Park Trail Run

Trail Run 10 km 21 km 42 km
May
31
Sunday

Evergreen Half Marathon

5 mi 13 mi
May
31
Sunday

NSRF Run to the Verrazzano 4 Miler

4 mi
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