City of Trees Marathon
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City of Trees Marathon - Boise, October 10, 2026
The City of Trees Marathon is scheduled for Saturday, October 10, 2026, in Boise, Idaho. The event is based at 733 S Pioneer Street, Boise, ID 83702, and is organized by City of Trees Marathon. Course maps will be updated once details are finalized.
The event program includes the following distances:
- Marathon
- Half Marathon
- 10k
- 5k
Courses use the Boise Greenbelt system. The Greenbelt and adjacent river can be unpredictable; local maintenance and natural conditions may affect the route. Typical issues noted include sidewalk construction, sinkholes, and flooding. Wildlife may be encountered on course and could cause delays or route changes.
All finishers receive a finisher's award and finisher food and drink. A long sleeve t-shirt and additional sponsor swag are provided, but registrants who register after October 1, 2026 are not guaranteed a shirt.
Listed entry fees and availability at the time of posting were: Marathon $65 (299 spots), Half Marathon $55 (959 spots), 10k $45 (313 spots), 5k $35 (321 spots). Prices were noted to increase after April 30, 2026. Visit the organization's website for the most recent information.
