A Wonderfully Challenging Spring Run
All-Out Spring Fever
Sunday, March 23, 2025 9a
JeffCo NAAC, Golden, CO
Half Marathon
Course conditions
Spring Fever course update: we finished marking the course, and it's beautiful! 2 things:
1) the winds are expected to be a little gusty and pick up more around noon. So if you're towards the back of the half marathon, you might be running against 20 mph+ westerlies at the top of the reservoir. And when you get back to venue, we will still be there for you but might have to drop tents and the finish arch for safety.
2) don't forget about the 3-mile gap between aid stations for 10K and half athletes.
--Stacy
From the base of Table Mountain and the stunning foothills of Colorado, All-Out Multicourse proudly presents our 13th Annual Spring Fever, benefiting our NEW charity partner, UpRoot Colorado! Conveniently accessible from several nearby highways, Spring Fever celebrates the arrival of spring, blooming flowers, and our buzzing friends the bees with our mascot Buzzby. Alongside its October endless series counterpart, Kooky-Spooky, this event features 5K, 10K, and Half Marathon courses that trace the scenic shores of Arvada's Blunn Reservoir via the Ralston Creek Trail. Both novice and experienced athletes will find these courses a rewarding challenge!
Location
An official BOLDERBoulder qualifying event!
We are thrilled to announce that Spring Fever has been designated as an official BOLDERBoulder Qualifier event! You can use your finishing time from any distance of this race to qualify for one of the BOLDERBoulder's qualified waves. For more details on the BB10K qualifying waves, please visit this link.
Partners
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