Washington Triathlon Calendar 2025-2026

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Explore the best triathlons in Washington for 2025-2026! Our updated list features 327 exciting races across the region. Find your next race in Washington below and join the running community at these great events!

May 2025
May
3-4
Sa - Su

Tacoma City Marathon

5 km 10 km 13 mi 26 mi
May
3-4
Sa - Su

Seattle North Spartan Event Weekend

Obstacle Run 5 km 10 km
May
3
Saturday

Never Say Never Half Marathon

10 km 13 mi
May
3
Saturday

Rage in the Sage Duathlon

Duathlon
May
3
Saturday

Half Marathon at Langus Riverfront Park

5 km 10 km 15 km 13 mi
May
3
Saturday

Fire on the Mountain

Trail Run 13 mi
May
3
Saturday

The Best Races - Seattle

5 km 10 km 13 mi
May
3
Saturday

I Run for Ronald 5K

5 km
May
3
Saturday

Chum Run 5k

Trail Run 5 km
May
4
Sunday

Bloomsday

12 km
May
4
Sunday

Kirkland Half Marathon

5 km 13 mi
May
4
Sunday

May the Course be with You 5k

5 km
May
4
Sunday

Sun Lakes Trail Run

Trail Run 7 mi 14 mi 21 mi
May
4
Sunday

Mt Si Trail Run

Trail Run 13 mi 26 mi 50 km 50 mi
May
4
Sunday

Kaci Edelbrock Memorial 5K Run/Walk

5 km
May
4
Sunday

Bursting Bubble 5K Walk & Run - Bothell

5 km
May
9-10
Fr - Sa

Tiger Claw

Trail Run 2 mi 50 km 50 mi
May
10
Saturday

Inspiring Hope Run 10k

5 km 10 km
May
10
Saturday

San Juan Island Half Marathon

13 mi
May
10
Saturday

Trillium Trail Run

Trail Run 5 km 10 km
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