Trail Running Calendar United States 2025-2026

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Explore the best trail runs in the United States for 2025-2026! Our updated list features 9108 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
16-17
Sa - Su

Cleveland Spartan Trifecta Weekend

Obstacle Run 5 km 10 km 21 km 50 km
May
16
Saturday

Butterfield Backyard Ultra

Backyard Ultra 6 hr 12 hr
May
16
Saturday

Run for Amma

Trail Run 10 km 30 km 50 km
May
16-17
Sa - Su

Agape 100k + 50k

Trail Run 50 km 100 km
May
16
Saturday

Rim Rock 50 Mile Trail Challenge

Trail Run 50 mi
May
16
Saturday

Whitefish Marathon

5 km 13 mi 26 mi
May
16
Saturday

Tackle The Tar

Obstacle Run 5 km
May
16
Saturday

Born to Run Ultra Marathon Extravaganza

Trail Run 10 mi 20 mi 30 mi 100 mi
May
16
Saturday

Endure Trail Runs

Backyard Ultra 10 km 13 mi 26 mi 12 hr
May
16
Saturday

Armed Forces Endurance Run

Backyard Ultra 6 hr 12 hr 24 hr
May
16-17
Sa - Su

Quest for the Crest 50k

Trail Run 11 km 25 km 50 km
May
16-17
Sa - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
May
16
Saturday

O'Neill Park Trail Races

Trail Run 10 km 13 mi ... 26 mi 50 km
May
16
Saturday

Oil Creek 13 Stacked Trail Race

Trail Run 5 mi 13 mi
May
16-17
Sa - Su

Cleveland Marathon

5 km 10 km 13 mi 26 mi
May
16
Saturday

Syttende Mai Classic Run

2 mi 5 km 13 mi
May
16
Saturday

Taco 'Bout Fun Run

Trail Run 5 km 10 km
May
16
Saturday

Red Devil Dash

5 km
May
16
Saturday

Crawdad Days 5K

5 km
May
16
Saturday

Run for Nicaragua 5K

5 km
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