City of Trees Marathon

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

All finishers receive awards, finisher food and drinks, and swag including coveted t-shirts and hoodies, with a registration deadline for guaranteed shirts. The event is supported by local sponsors and emphasizes community involvement. Visit the organization's website for the most recent information.