Colorado · Georgetown

Divide

Founded in 2019, the Divide 100 ran out-and-back from Georgetown, Colorado at an average altitude of 11,500 feet — the highest 100-miler in the state. The route crossed Argentine Pass (13,207 feet, the highest vehicle-accessible pass in Colorado), Red Cone, and Guanella Pass, accumulating nearly 29,000 feet of vertical on alpine singletrack and 4WD roads. Last held in August 2022, when 4 of 7 starters finished, it was rebranded as Silver Creek Mountain Runs in 2024 but that edition was cancelled for permit reasons; no subsequent editions have been confirmed.