All-Out Fall Fest

The All-Out Fall Fest is an annual running event held in Westminster, Colorado, featuring Half Marathon, 10K, and 5K races, along with virtual options for each distance. The course follows the scenic Big Dry Creek Trail, offering stunning views of Standley Lake and the Flatirons. This event embraces a fun, nostalgic 70s theme and supports #themarshalleffect, a charity focused on youth mental health and suicide prevention.

It is also an official BOLDERBoulder qualifier, allowing runners to use their finishing times to qualify for the 2026 BOLDERBoulder race. The festival atmosphere combines beautiful natural surroundings with community spirit and charitable support. Visit the organization's website for the most recent information.