There are 102 half marathons in Washington scheduled for 2026. The next is the Haunted 5K, 10K & 13.1M at Camas, WA (43) in Camas on October 24. Washington half marathons run primarily October.

Run the Bay

Sun, Nov 8 · University Place, WA University Place
Run the Bay 5kRun the Bay 10kRun The Bay Half Marathon

Coffee Lover Run SEATTLE

Sat, Jan 30 · Seattle, WA Seattle
Family Fun Run 1 Mile5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration (5K/10K/13.1) +3