City of Trees Marathon
City of Trees Marathon gives Boise a fall full marathon with Greenbelt miles, river scenery, neighborhood support, and a broad slate of shorter races.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 21, 2026.
Quick facts
- Boise River Greenbelt setting.
- Full marathon with half marathon, 10K, and 5K options.
- Mostly flat river-corridor running.
About the City of Trees Marathon
This established Boise race weekend uses the city's river corridor for its full marathon and companion distances. It is a convenient regional option with familiar RunSignup logistics.
Course
The course draws heavily on the Boise River Greenbelt and nearby roads, producing a generally flat path-and-road feel. Shared-use sections and turns reward awareness more than hill strength.
Race-day weather
Boise in October is commonly cool and dry at the start, then warmer under high-desert sun. Open Greenbelt sections may pick up wind.
Past City of Trees Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Sunday, October 11, 2026 | Upcoming | — |
| 2025 | Saturday, October 11, 2025 | Completed | Open results |
| 2024 | — | Completed | Open results |
City of Trees Marathon FAQ
When is the City of Trees Marathon?
The 2026 City of Trees Marathon is on Sunday, October 11, 2026.
How do I register for the City of Trees Marathon?
You can register for the City of Trees Marathon at runsignup.com.
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