City of Trees Marathon
About this race
Sunday, October 11, 2026
Course Maps will be updated once details have been finalized.
GREAT SWAG and T-SHIRT DEADLINE
Comfiest long sleeve t-shirt, swag thanks to our amazing sponsors, and finisher food/drink, all COT runners get a finisher's award. Please note that registrants registering after October 1, 2026 are not guaranteed a shirt.
Please note courses utilize the Boise Greenbelt system. Should we run the Greenbelt, the river can be unpredictable. Systems and entities that govern the local Greenbelt are constantly dealing with these challenges. Typical issues are created due to sidewalk construction, sinkholes, flooding, etc. During the run, you may encounter wildlife that may cause a delay in your progress and/or change in your planned route. Or you may cause your own delay to stop and listen to the amazing sounds this course creates.
Join fellow runners on October 11, 2025 for the City of Trees Marathon. It's a fantastic Marathon, Half-Marathon, 10K, 5K featuring a flat and fast course in Boise.
Pick your distance
Running
Marathon
Half Marathon
10k
5k
Weather Overview
These values reflect historical conditions on the race dates in Boise in 2025, from Open-Meteo archive data.
About Boise
City of Trees Marathon takes place in Boise, Idaho, United States. The local timezone is America/Boise.
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Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.