Washington Half Marathon Calendar 2025-2026

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Explore the best half marathons in Washington for 2025-2026! Our updated list features 129 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
Saturday

Never Say Never Half Marathon

10 km 13 mi
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
4
Sunday

Kirkland Half Marathon

5 km 13 mi
May
4
Sunday

Mt Si Trail Run

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

San Juan Island Half Marathon

13 mi
May
10
Saturday

Half Marathon at Heritage Park

5 km 10 km 15 km 13 mi
May
10
Saturday

Snohomish Women's Run

5 km 10 km 13 mi
May
11
Sunday

Leavenworth Mai Blumenlauf

5 km 10 km 13 mi
May
11
Sunday

Mermaid Run Spokane

5 km 10 km 13 mi
May
17-18
Sa - Su

Capital City Marathon

5 mi 13 mi 26 mi
May
17
Saturday

Half Marathon at Chiawana Park

5 km 10 km 15 km 13 mi
May
17
Saturday

Half Marathon at Lowell Riverfront Park

5 km 10 km 15 km 13 mi
May
18
Sunday

Reflection Run Washougal

5 km 10 km 12 mi 13 mi
May
18
Sunday

The Teanaway Trail Run

Trail Run 5 km 10 km 13 mi 26 mi
May
18
Sunday

Sharky's Ocean Shores Half

13 mi
May
18
Sunday

Windermere Marathon

5 km 10 km 13 mi 26 mi
May
24
Saturday

Half Marathon at Liberty Park

5 km 10 km 15 km 13 mi
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