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 11391 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
17
Sunday

Highball to Thurmond Ultra

Trail Run 50 km 50 mi
May
17
Sunday

Sand to Serengeti

Trail Run 3 mi 10 mi
May
17
Sunday

Kansas City Triathlon

Triathlon
May
17
Sunday

NYC Teen Race of Hope

5 km
May
17
Sunday

Texasman Triathlon

Triathlon
May
17
Sunday

Ironman 70.3 Chattanooga

Triathlon
May
21-30
Th - Sa

Infinitus - Ripton

Trail Run 9 mi 26 mi ... 250 mi 888 km
May
22-25
Fr - Mo

High Hope Endurance Run

Trail Run 5 km 10 km ... 100 km 200 km
May
22-23
Fr - Sa

Feel The Burn Trail Runs

Trail Run 10 km 20 km 30 km 50 km
May
22-23
Fr - Sa

West Virginia Trail Fest

Trail Run 5 km 30 km 60 km 100 km
May
23-24
Sa - Su

Nanny Goat

Trail Run 6 hr 12 hr 100 mi 24 hr
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 - Mo

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
23-24
Sa - Su

Back 9 Endurance Run

Backyard Ultra 12 hr 24 hr
May
23-24
Sa - Su

Ultra Cheii 100 Mile

Trail Run 100 mi
May
23
Saturday

Cedarburg Half Marathon

5 km 13 mi
May
23
Saturday

Stillwater Half Marathon

5 km 10 km 13 mi
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