Boulderthon Full and Half Marathon Course Preview

Our course preview runs will begin departing in waves from Fleet Feet Boulder at 7AM. Those running the full marathon will take on a 12ish mile course preview and those running the half marathon will run a 8 mile preview. Both course previews will have pacers outfitted by lululemon dedicated for each minute per mile pace from 8min/mile to 13min/mile.

Full Marathon Course Preview Route

Half Marathon Course Preview Route

Please bring the QR Code that is issued upon checkout, as participants will be required to check-in at the time of the event.

This event is a course preview, not a race. There will be no aid stations, no course marshals, and no road closures. Participants are responsible for their own hydration, nutrition, and safety throughout the route.

The course remains open to the public, so please be courteous and share the bike paths and roads with pedestrians, cyclists, and other trail users. When running on roads, obey all traffic laws, use designated crosswalks where available, and yield to vehicle traffic. Stay alert, avoid distractions, and be aware of your surroundings at all times.

By participating, you acknowledge that you are responsible for navigating the course safely and exercising good judgment in all traffic and shared-use areas.

Get a chance before and after the event to get to know some of our partners such as Precision Fuel & Hydration, lululemon, Boulder Community Health, Send Bars, Ultimate Longevity Center, Alive & Well, Cheribundi and more!

There is very limited parking at Fleet Feet Boulder and its complex. We want to be mindful of our neighboring businesses, so we ask that you try to park in the neighborhood near the store or in one of the very large lots on the southeast or northeast corners of 28th and Pearl. Carpool if possible!