
From the Organizer
Join Denver’s largest running weekend May 16–17, 2026 by signing up for the Colfax Marathon, Half, 5K, 10 Miler, or the Relay and make every mile count for Growing Home!
When you run as part of Growing Home’s Charity Partner team, you are doing more than crossing a finish line. You are helping families across the North Denver metro area access the resources they need to thrive. Your miles support Food and Resource Assistance, Early Childhood Development, and Stability Support Services, helping create pathways to stronger, healthier futures.
Every step you take helps strengthen our community.
👟 Ready to lace up? SIGN UP TODAY!
Distances & Pricing
Race Location
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
The Springs Downhill Mile
DRMABPsi 1–5K Walk, Run & Roll
Byers Peak Stampede Half Marathon & 5K Run
Frequently Asked Questions (FAQs)
Growing Home - Colfax Fundraiser
May 16, 2026