
Colorado 13er (Half Marathon/10k/5k)
Colorado 13er offers a scenic, flat, crushed gravel course with Flatirons views in Louisville.
Race Date
Jun 7, 2026
Location
Louisville, CO
Quick facts
- Date
- Sunday, June 7, 2026
- Location
- Louisville, Colorado
- Distance
- Half marathon (13.1 mi) + 10K, 5K
- Course
- Loop Course
- Terrain
- Mixed
- USATF certified
- Not listed
- Finishers on record
- 1,956
Highlights
Good For
Atmosphere
Course
The Experience
The Colorado 13er presents a unique blend of trail and road racing, set against the stunning backdrop of Louisville, Colorado, with spectacular views of the Flatirons. This well-supported, looped 13.1-mile course is designed to be kind to your body, featuring nine miles of flat, crushed gravel that appeals to both seasoned runners and first-timers.
With a growing field that has recently seen around 283 finishers, the event draws participants from approximately 11 states. Runners can expect excellent communication from the race crew, 10 aid stations, and gender-specific performance tees. The race, first run in 2013 and now in its 12th edition, offers a welcoming atmosphere for athletes of all levels, complete with a finisher medal and iced towels at the finish line.
Race-provided description
The Colorado 13er is THE event where the best parts of trail running and road racing combine to create a truly enjoyable, kind-to-your-body, well-supported 13.1 race! Seasoned runners and first-timers alike appreciate the excellent communication from the 13er race crew who make this event accessible for athletes of all levels. ------------------------------------------- Join us for this exceptionally scenic, looped 13.1 course which runs through gorgeous Louisville, Colorado! We designed this course so that you can enjoy all of the spectacular views of the Flatirons that Colorado has to offer. Come see for yourself! Groups/Teams/Families: Save $5 per person for groups of 5 or more! See our FAQ page for more questions! Click the drop-down menu under "race info" for all race details! Any questions, please email us at info@colorado13er.com ------------------------------------------- Here's the good stuff!! - 10 water station passes - 5 port-a-john passes - 9 miles of FLAT, crushed gravel - nearby, free parking - spectator friendly - 13.1 finisher medal - 10k or 5k options available - iced towels at the finish line - gender-specific performance tees for every registrant - chip timed with texted results - live, real-time results posted online - 13.1 miles of million-dollar views AND - the amazing sense of accomplishment you can only get from running 13.1! (or 5k or 10k!)
Logistics
Race Day
Sunday, June 7, 2026
Start Time
6:30 AM
Giveaway
Short Sleeved Tee
Start Location
1200 Dillon Road, Louisville, CO, 80027
Course Info
Course Type
Loop Course
Terrain
mixed
Scenery
Mountain, Urban
Surface
Dirt Trail
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
3 other maps for this race
Quality Score
Solid Pick5512 years running
~220 finishers a year
growing or steady
4% returning runners
5 timing sources
runners from 11 states
winner 1:20:26
typical high 79°F
Race Day Weather
5-year historical avgStart (Low)
53°
Afternoon (High)
79°
Warm — hydration strategy is key, start conservatively
0.1"
Precipitation
11 mph
Wind
56%
Humidity
Historical Finish Times
How 1,956 finishers actually crossed the line across 12 years.
Most recent
2025
Total finishers
1,956
Median time
2:12:05
Latest turnout
143
States
38
Turnout by year
2017–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Colorado 13er (Half Marathon/10k/5k)?
The Colorado 13er (Half Marathon/10k/5k) is held on Sunday, June 7, 2026, starting at 6:30 AM.
Where does the Colorado 13er (Half Marathon/10k/5k) take place?
It takes place in Louisville, Colorado.
What distances does the Colorado 13er (Half Marathon/10k/5k) offer?
The half marathon (13.1 miles), plus 10K, 5K.
Is the Colorado 13er (Half Marathon/10k/5k) course flat and good for a PR?
The Colorado 13er (Half Marathon/10k/5k) is a ultra-flat, loop course course.
How many people run the Colorado 13er (Half Marathon/10k/5k)?
HalfRuns has finish records for 1,956 runners who have completed the Colorado 13er (Half Marathon/10k/5k).
HalfRuns editorial — independent, no paid placement.
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