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Trail Running Calendar near Sammamish 2025-2026

Explore the top trail runs near Sammamish for 2025-2026! We've gathered 86 exciting races in the area. Check out our detailed list below to find your next local race.

April 2025
Apr
19
Saturday

Running in the RAINN 5k

5 km
Apr
19
Saturday

Half Marathon at Lowell Riverfront Park

5 km 10 km 15 km 13 mi
May 2025
May
3-4
Sa - Su

Seattle North Spartan Event Weekend

Obstacle Run 5 km 10 km
May
3
Saturday

Half Marathon at Langus Riverfront Park

5 km 10 km 15 km 13 mi
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

Mt Si Trail Run

Trail Run 13 mi 26 mi 50 km 50 mi
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

Trillium Trail Run

Trail Run 5 km 10 km
May
10
Saturday

Snohomish Women's Run

5 km 10 km 13 mi
May
10
Saturday

Cougar Mountain Trail Run

Trail Run 5 mi 10 mi
May
11
Sunday

Cedar River Triathlon

Triathlon
May
17
Saturday

Dirty Turtle 25/50k

Trail Run 25 km 50 km
May
17
Saturday

Run or Wine 5K Series

5 km 10 km
May
17
Saturday

Half Marathon at Lowell Riverfront Park

5 km 10 km 15 km 13 mi
May
17
Saturday

Viking Fest Road Race

5 mi
May
24-25
Sa - Su

Pigtails Challenge

Trail Run 50 km 100 km ... 150 mi 200 mi
May
24
Saturday

Sri Chinmoy 13 Hour Ultra

Backyard Ultra 7 hr 13 hr
May
24
Saturday

Sri Chinmoy - Seattle, WA

Trail Run 3 hr 7 hr 13 hr
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