Colorado 13er Half Marathon, 10k, & 5k

Sunday, June 1, 2025 • Louisville, CO

The Colorado 13er event offers participants the option of a Half Marathon, 10k, or 5k, with the half marathon being a largely flat looping course. Partnering with a local charity, this event is in support of Community Food Share, a local foodbank with a mission to empower the impoverished.

Scenic Views, Trail Runners, Road Runners. Located in the picturesque city of Louisville, Colorado, and hosted during the early summer days, this half-marathon comprises dirt trails and paved roads, great for experienced and beginner road runners alike.

With spectacular views of the Colorado Flatirons throughout, the mountainous views that runners can expect to enjoy are just one of the many reasons this event is beloved by so many.

Starting near Home Depot on 1200 Dillon Road, runners quickly exit onto Dyer Road before veering off onto the US 36 Bikeway. It’s then through the gravel trails, crossing McCaslin Blvd, and circling Harper Lake before retracing their steps back toward the finish line.

By signing up and completing this race, you’ll receive a custom collector’s t-shirt offered in a variety of gender-specific colours, along with a commemorative finisher’s medal for those who cross the line successfully.

Race Weather & Climate

Louisville is a picturesque city in northern Colorado, located about 7 miles east of Boulder, renowned for its small-town charm, vibrant downtown, and outdoor recreational opportunities.

June 1 in Louisville, Colorado welcomes the early days of summer. High temperatures typically reach around 78°F, creating a warm and inviting atmosphere for outdoor activities. As the day turns into evening, temperatures remain comfortable, with lows reaching approximately 50°F. Precipitation is generally low, with an average of just 1.0 inch, making it an ideal day to enjoy the sunny weather and outdoor attractions in Louisville.