Boulder Rez Half
Boulder, Colorado, United States
Apr, 2027 (TBD)
5k, 10k, Half-marathon
Race Information
This early summer race features a spectator-friendly Half Marathon, 10K, and 5K course. It attracts athletes from all over the West due to its phenomenal scenery, glamorous finisher medals, and perfect running temperatures with many nearby Boulder attractions to enjoy after the race.
The run course loops around the Boulder Reservoir and remains mostly on dirt trails. The course is flat with only 200 feet of elevation gain. You will experience iconic views of the mountain range to the west.
The Half Marathon will complete 2 loops, and the 10K will complete one loop. 5K runners will take a different course route.
Related Events
All-Out Kooky-Spooky
Date: Nov 1, 2026 - Sunday
Size: 500 - 1,000 participants
Location: Arvada, Colorado
Old Man Winter Bike Rally and Run
Date: Feb 7, 2027 - Sunday
Size: 1,000 - 5,000 participants
Location: Boulder, Colorado
The Great Trailhead Footrace
Date: Oct 17, 2026 - Saturday
Size: 100 - 500 participants
Location: Lakewood, Colorado
👍 Run Pick of the Month: Colorado Springs Marathon
📍Colorado Springs - Saturday October 3, 2026
💸 SAVE 10% On Your Entry. Use Code RunGuides
😄 Why We Like This Run
✅ Scenic point-to-point course
✅ Multiple distances, including kids run
✅ Premium swag & finisher medals
Experience the ultimate running tour of Olympic City USA. Whether you’re chasing a personal best or crossing your first finish line, the Colorado Springs Marathon offers an unforgettable race day backdropped by the majestic Rockies.
We aren't kidding when we say this race is a local favorite. The Colorado Springs Marathon has sold out 5 years in a row! Don't be the one watching from the sidelines. Secure your spot on the starting line today and prepare to elevate your run.
Free Plan for Beginner Runners
Receive a FREE training plan for beginner runners from our friends at None to Run
Are you looking to become a runner for the first time? Coming back to running after a hiatus? Our friends at None to Run have created a training plan for beginner runners
The None to Run Beginner Plan is super gradual and achievable, no matter your starting point.
In 12 weeks, you’ll be able to run 25 minutes non-stop...and actually enjoy it!
Click the button below to get your free training plan.
🏃 Looking For More Runs Near Denver?
Find another distance:
Race Facts
Race Size: 100 - 500
Elevation: Fast and Flat
Course Type: Trail
Boston Qualifier: No
Kids Run: No
Where to Stay
Use this map to find hotels and airbnb accommodation near this race location.
