City of Trees Marathon

The City of Trees Marathon, held in Boise, Idaho, offers runners a variety of race distances including a full marathon, half marathon, 10k, and 5k. The event takes place on October 11, 2025, with courses that utilize the scenic Boise Greenbelt system along the river. Participants may experience natural challenges such as wildlife encounters, construction, or flooding, adding a unique outdoor element to the race.

All finishers receive awards, finisher food and drinks, and swag including a coveted t-shirt or hoodie, with a registration deadline for guaranteed shirts. The race atmosphere celebrates community and nature in Boise’s vibrant setting. Visit the organization's website for the most recent information.