Experience the charm of Idaho's capital at the City of Trees Marathon, returning on October 10, 2026, in picturesque Boise. This beloved annual event offers a distance for every runner, including a full marathon (26.2M), half marathon (13.1M), 10K, and 5K, inviting athletes of all levels to enjoy a scenic tour of the city. As its name suggests, the course winds through Boise's beautiful tree-lined streets, historic neighborhoods, and numerous city parks, all set against the vibrant backdrop of fall foliage. Participants can anticipate typical race day conditions with comfortable highs around 67°F and lows around 44°F, and only a 4% chance of precipitation.

The City of Trees Marathon is renowned for its generally flat and fast route, making it an excellent opportunity for personal bests or a Boston Marathon qualifying time. Runners will navigate the stunning Boise Greenbelt system alongside the scenic Boise River, with the full and half marathon courses following an out-and-back design that starts and finishes at Parkcenter Park. While largely flat, the marathon boasts an elevation gain of approximately 62 meters, with a gradual downhill in the first half and a corresponding gradual uphill in the second. Hydration stations, stocked with water, sports drinks, GU gels, and fuel, are strategically placed approximately every two miles to support runners throughout their journey. Portable toilets and first-aid are also readily available.

Organized by SoleKIDs, INC., a non-profit dedicated to quality running events, the City of Trees Marathon is celebrated for its welcoming atmosphere and strong community spirit. Runners consistently praise the breathtaking scenery and the well-organized nature of the event. Beyond the race itself, participants will receive fantastic swag, including a comfy long-sleeve t-shirt and a finisher's award, adding to the memorable experience of running through a city frequently recognized as one of the nation's best places to run.