In 166 days · Sun, Mar 21, 2027
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Sunday, March 21st, 2027
19500 W 64th Pkwy, Golden CO
Half · 10K · 5K
27–52°F · some rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2026
44–86°F
dry
2025
29–54°F
dry
2024
26–60°F
dry
2023
26–54°F
dry
2022
28–39°F
rain
2021
27–37°F
rain
2020
15–40°F
dry
2019
19–47°F
dry
2018
21–57°F
dry
2017
38–68°F
dry
Best months to race in Colorado →
Race-day forecast says layers
27°F at the start.
Gloves, ear warmers, throwaway layers, hand warmers — delivered before race day.
About this race
All-Out Multicourse is proud to host our 15th Annual Spring Fever, a rewarding event for both novice and experienced athletes set against the backdrop of Table Mountain and the stunning Colorado foothills. This spring celebration, featuring our mascot Buzzby, includes 5K, 10K, and half marathon courses that trace the scenic shores of Arvada's Blunn Reservoir via the Ralston Creek Trail. Conveniently accessible from nearby highways, Spring Fever is the endless series spring counterpart to Kooky-Spooky, and proudly benefits our NEW charity, People and Pollinators Action Network (we really love the bees). And don't miss that you can use Spring Fever to qualify for your BOLDERBoulder wave!
Course map
Train with a club
Run clubs near Golden to train with before race day.
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