All-Out Spring Fever
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Event details
All-Out Spring Fever takes place on March 22, 2026 in Golden, Colorado. The event is presented by All-Out Multicourse as the 14th annual Spring Fever and offers both in-person and virtual options. Distances offered:
- Half Marathon
- 10K
- 5K
- VIRTUAL Half Marathon
- VIRTUAL 10K
- VIRTUAL 5K
Listed registration prices (including fees) are: Half Marathon $69.90; 10K $48.70; 5K $38.10; VIRTUAL Half Marathon $48.70; VIRTUAL 10K $38.10; VIRTUAL 5K $32.80. Reduced entry rates are shown for ages 0-14 and 65-99 for each distance. Prices increase after December 22, 2025.
Course, charity and qualification
The in-person courses follow the Ralston Creek Trail and trace the shores of Arvada’s Blunn Reservoir, set against Table Mountain and the Colorado foothills. The event benefits UpRoot Colorado, an organization that increases nutrition security by harvesting and redistributing surplus nutrient-dense foods and supporting farmers. All-Out Spring Fever is designated as an official BOLDERBoulder qualifying event; finishing times from any distance may be used to qualify for BOLDERBoulder waves. Visit the organization's website for the most recent information.
