2027 Kaiser Permanente Colfax Marathon
The Kaiser Permanente Colfax half runs through a stadium, fire station, and the zoo.
Race Date
May 15, 2027
Location
Denver, CO
Quick facts
- Date
- Saturday, May 15, 2027
- Location
- Denver, Colorado
- Distance
- Half marathon (13.1 mi)
- Course
- Loop Course
- Terrain
- Road
- USATF certified
- Not listed
Highlights
Good For
Atmosphere
Course
The Experience
On a May weekend in Denver, the Kaiser Permanente Colfax Marathon half-marathon draws nearly 6,000 runners from 46 states. Now in its 20th year, this urban course delivers one-of-a-kind sights: a mile through the Denver Zoo, a sprint through Empower Field at Mile High, and a pass by a working fire station, all linked by waterways and city streets. The atmosphere is electric, with spectators lining the route to cheer on the diverse field.
The half is fast and competitive—recent winning times hover around 63 minutes—yet welcoming enough to draw about a quarter of runners back each year. The finish line opens into a post-race party known for its charitable spirit, making the experience as rewarding off the course as on it. For a race that blends quirky landmarks with serious speed, Denver’s Colfax half is a standout destination event.
Race-provided description
The Kaiser Permanente Colfax Marathon is Denver's only marathon, held on a weekend in May. It features a Boston Qualifier marathon course that runs through Empower Field at Mile High, a fire station, and along waterways. The half marathon includes a mile through the Denver Zoo. Other events include an Urban 10 Miler, a 5K, and marathon relays. The race is known for its post-race party and charitable giving.
Course Info
Course Type
Loop Course
Terrain
road
Scenery
Urban, Lake River
Surface
Paved
Difficulty
Rolling Hills
Quality Score
Standout8019 years running
~5,890 finishers a year
growing or steady
23% returning runners
2 timing sources
runners from 46 states
winner 1:03:05
typical high 72°F
Race Day Weather
5-year historical avgStart (Low)
44°
Afternoon (High)
72°
Warm — hydration strategy is key, start conservatively
0.1"
Precipitation
11 mph
Wind
54%
Humidity
Frequently asked
When is the 2027 Kaiser Permanente Colfax Marathon?
The 2027 Kaiser Permanente Colfax Marathon is held on Saturday, May 15, 2027.
Where does the 2027 Kaiser Permanente Colfax Marathon take place?
It takes place in Denver, Colorado.
What distances does the 2027 Kaiser Permanente Colfax Marathon offer?
The half marathon (13.1 miles).
Is the 2027 Kaiser Permanente Colfax Marathon course flat and good for a PR?
The 2027 Kaiser Permanente Colfax Marathon is a rolling hills, loop course course.
HalfRuns editorial — independent, no paid placement.
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