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 9139 exciting races across the country. Find your next race in the United States below and join the running community at these great events!

May 2025
May
20
Tuesday

National Rescue Dog Day 10k

5 km 10 km
May
20
Tuesday

MRT Series

5 km
May
20
Tuesday

All American Week 10 Miler

10 mi
May
20
Tuesday

Dash & Dine 5k

5 km
May
20
Tuesday

Catamount Weekly Trail Running Race

Trail Run 5 km
May
21-22
We - Th

4K Trail Run

Trail Run 4 km
May
21
Wednesday

South Fork Duathlon

Duathlon
May
21
Wednesday

ESTRS Lebanon 10KM

Trail Run 10 km
May
21
Wednesday

LIRRC Wednesday Night Summer Series

5 km
May
21
Wednesday

ASFPM 5K - Running in the Oaks

5 km
May
22
Thursday

Run & Remember 5k

5 km
May
22
Thursday

Biz Dash 5K

5 km
May
22
Thursday

Bay City Memorial Run

5 km
May
22
Thursday

Legal Runaround 5K

3 km 5 km
May
22
Thursday

Kit Carson 3 Mile

3 mi
May
23
Friday

Coalfields Backyard Ultra

Backyard Ultra 4 mi
May
23-26
Fr - Mo

Weld Your Mettle Running Festival

Backyard Ultra 7 km 3 hr ... 12 hr 24 hr
May
23
Friday

Clear Lake Triathlon

Triathlon
May
23
Friday

Lakeside Double Sprint Triathlon

Triathlon
May
23-24
Fr - Sa

RunningLane Track Championships

3 km
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