
Running Colorado: Why the Horsetooth Half, Colorado Marathon, and BOLDERBoulder Should Be on Your Race Calendar
Colorado is renowned for its vibrant running community and hosts several iconic races that attract participants from around the globe. Among these, the Horsetooth Half Marathon, Colorado Marathon, and BOLDERBoulder 10K. Here’s an overview of these races in 2025, including their distances, dates, times, histories, entry costs, locations, and reasons to participate. Horsetooth Half Marathon