All-Out Multicourse is proud to host our 14th 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 UpRoot Colorado. And don't miss that you can use Spring Fever to qualify for your BOLDERBoulder wave!

03-22-2026, 09:00 am - 03:00 pm