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Triathlon Calendar near Sammamish 2025-2026

Explore the top triathlons near Sammamish for 2025-2026! We've gathered 119 exciting races in the area. Check out our detailed list below to find your next local race.

May 2026
May
9
Saturday

Inspiring Hope Run 10k

5 km 10 km
May
10
Sunday

Snohomish Women's Run

5 km 10 km Half Marathon
May
16
Saturday

Soaring Eagle Trail Run

Trail Run 5 km 10 km 20 km
May
23
Saturday

Run to End Weekend Hunger 5K

5 km
May
31
Sunday

Evergreen Half Marathon

5 mi Half Marathon
June 2026
Jun
6
Saturday

Vashon Island Ultramarathon & Trail Run

Trail Run 10 mi 20 mi 50 km
Jun
13
Saturday

Centennial 100 Relay Run

100 km
Jun
27
Saturday

Sisu 24 Ultra PNW

Backyard Ultra 100 mi 24 hr
Jun
27
Saturday

Tiger Peak Challenge

Trail Run 5 mi Half Marathon 50 km
Jun
27
Saturday

Seattle Half Marathon

5 km 10 km Half Marathon
July 2026
Jul
17-18
Fr - Sa

Mount Rainier Half Marathon

Trail Run 5 km 10 km Half Marathon
Jul
18
Saturday

Lookin For A Cure Seattle

5 km
Jul
25-26
Sa - Su

Jack & Jill Downhill Marathon

13 mi 26 mi
August 2026
Aug
15
Saturday

One Step Closer

Backyard Ultra 3 hr 6 hr 12 hr 18 hr
Aug
16
Sunday

Sundae Runday

2 mi 5 km 10 km
Aug
22
Saturday

Run A Muk 10k

5 km 10 km
Aug
30
Sunday

Iron Horse Half Marathon

13 mi
September 2026
Sep
19-20
Sa - Su

Seattle North Spartan Trifecta Weekend

Obstacle Run 5 km 10 km Half Marathon
Sep
20
Sunday

Run of the Mill 5k - Mill Creek

5 km
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