Boise Greenbelt Relays & 50 Mile Ultra

Get ready for an unforgettable day of running at the Boise Greenbelt Relays & 50 Mile Ultra on Saturday, May 9, 2026, in beautiful Boise, ID. This unique event, celebrating its second annual running, is the only relay race in the Treasure Valley and now introduces a challenging 50-mile ultra distance for solo runners. Whether you're tackling the full 50 miles solo or joining forces with a team of two, four, or six-to-seven runners for the 45-mile relay, you'll experience a fast and flat loop course along the stunning Boise River Greenbelt. The scenic, tree-lined pathway offers picturesque views and wildlife habitat as it winds through central Boise, Garden City, Eagle, and Southeast Boise.

Starting and finishing at Ann Morrison Park, the relay course is divided into seven legs, each ranging from five to eight miles, allowing teams to strategize their efforts. Six well-supported exchange zones are strategically placed in beautiful parks, providing not only aid and refreshments but also convenient parking and bathrooms for runners and their support crews. Typical race day conditions in May offer pleasant running weather, with highs around 71°F and lows around 46°F, and only a 6% chance of precipitation. The Boise Greenbelt Relays promise an exhilarating day filled with camaraderie, competition, and positive vibes for all participants.