City of Trees Marathon
Always double-check with the organizer's website! This page may contain affiliate links.
City of Trees Marathon
The City of Trees Marathon is a running event held in Boise, Idaho on Saturday, October 10, 2026. The event offers several in-person race distances and a virtual option, and is based at 733 S Pioneer Street, Boise ID 83702.
Registration windows and fees differ by event. In-person races generally open registration in November 2025 and close on May 1, 2026; the virtual option opens registration in March 2026 and closes in October 2026. Entry fees listed for the events include $65 for the marathon, $55 for the half marathon, $45 for the 10k, $35 for the 5k, and $45 for the virtual entry.
Distances offered:
- Marathon 26.2 Miles
- Half Marathon 13.1 Miles
- 10k 6.2 Miles
- 5k 3.1 Miles
- Virtual any distance
All City of Trees participants receive a finisher award. The event provides finisher food and drink and an event shirt and sponsor swag, though registrants after October 1, 2026 are not guaranteed a shirt. Course maps will be updated once details are finalized. The course uses the Boise Greenbelt system; runners may encounter construction, sinkholes, flooding, variable river conditions, or wildlife that could delay progress or require route changes. Visit the organization's website for the most recent information.
