About

This sunup-to-sundown challenge takes place on the Thumb Open Space trail, using repeating 2km out-and-back laps that each pack in 540 feet of climbing. The format is simple but demanding: runners head to the turnaround, collect a poker chip, and keep stacking ascents for as long as they can, creating a gritty, competitive atmosphere built around consistency, vertical gain, and mental toughness. With milestone achievements tied to cumulative climbing totals and a small participant field, the event has an intimate but hard-earned feel. The terrain and repeated steep effort make it a true test of endurance, rewarding runners who can handle sustained elevation gain over the course of the day.