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

My Better Half Marathon

Sun, Feb 14 · Seattle, WA Seattle
My Better Half 5KMy Better Half 10KMy Better Half Marathon Relay (2 people must register together) +1