All-Out Spring Fever
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All-Out Spring Fever : event overview
All-Out Spring Fever is scheduled for March 22, 2026, in Golden, Colorado, at JeffCo NAAC. This is the event's 14th annual running. The event is an official BOLDERBoulder qualifying event. Registration offers in-person and virtual options across multiple distances. A series option pairs this race with All-Out Beat the Heat (April 18, 2026) and includes a 25% discount per distance when both races are entered.
Course, distances and charity
The in-person courses run near the base of Table Mountain and the Colorado foothills and trace the shores of Arvada's Blunn Reservoir via the Ralston Creek Trail. The event benefits UpRoot Colorado, an organization that redirects surplus, nutrient-dense local produce into Colorado's hunger-relief system and supports farmers through education, research, and advocacy. Visit the organization's website for the most recent information.
- Half Marathon (in-person and virtual)
- 10K (in-person and virtual)
- 5K (in-person and virtual)