Introducing Boise’s first-ever race series — The Boise Four — your chance to be part of something truly special in 2026! Featuring the Boise River Marathon, The Boise Marathon, The City of Trees Marathon, and The Boise Half Marathon, this series welcomes everyone from brand-new runners to elite marathoners ready for their next big challenge. With Boise’s stunning river views and iconic tree-lined courses, each race delivers an unforgettable experience.  Runners signed up for The Boise Four race series will get exclusive series swag! Don’t miss your chance to join the club—if you’re not signed up by May 1st, you'll have to wait until next year. Be part of the action and make 2026 the year you run them all!

How it works:

You’ll pay one flat rate for the entire series, with the freedom to pick any distance in each race. This fixed price remains the same, but it’s only available until the first race starts on May 2, 2026. 

The fine print:

We can't apply discount codes.  If you are already registered for one of our 2026 races and would like to sign up for the series instead, shoot us an email and we will refund your single race registration after you've signed up for the series.  Same goes for deferrals from 2025. Lastly, the final race is a half marathon only, keep that in mind when picking your other three distances.