2026 Denver Colfax Marathon

About the Event

The Denver Colfax Marathon celebrates its 20th anniversary in 2026, solidifying its status as the largest running weekend in the Mile High City. Spanning two days of competition, the event centers around Denver’s iconic City Park and offers a diverse range of distances that highlight the city's unique urban landscape. Whether participants are looking for a solo challenge or a team-based experience, the weekend is designed to be an inclusive celebration of health and community spirit.

Category	Distance	Event Date	Start Time
5K Run/Walk	5 km	Saturday, May 16	09:00 AM
Full Marathon	42.2 km	Sunday, May 17	06:00 AM
Half Marathon	21.1 km	Sunday, May 17	06:00 AM
Urban 10 Miler	16.1 km	Sunday, May 17	06:00 AM
Marathon Relay	Shared 42.2 km	Sunday, May 17	06:00 AM

Managed by Team Colfax, the event serves as a major platform for local and national charities through its extensive Charity Partners Program. The marathon route is famous for its varied scenery, taking runners through traditional neighborhoods, stadium grounds, and past key metropolitan landmarks, ensuring a vibrant experience for all entrants.

Logistics and Participant Information:

-- Mile High Two Day Challenge: Runners can maximize their weekend by participating in the Saturday 5K followed by any of the primary Sunday race distances.
-- Location Hub: All major event activities and start/finish lines are concentrated within City Park, Denver, providing a central location for gear checks and post-race festivities.
-- Corporate and Group Support: The organization provides streamlined registration services for companies, large groups, and charities through a dedicated multi-registration code system.
-- Communication: Inquiries regarding sponsorship, charity involvement, or general race details are handled via specific electronic communication channels to ensure efficient participant support.
-- Anniversary Year: As the 20th running of the event, the 2026 weekend is expected to feature commemorative elements celebrating two decades of running along the Colfax corridor.

With its early Sunday start times, the marathon allows runners to enjoy the cooler morning temperatures and the unique atmosphere of a city waking up to one of its most anticipated annual sporting traditions.

Races Offered

Colfax 5K

May 16, 2026

straighten

Distance — 5K

terrain

Type — Others, Running

timer

09:00

sell

$54.88

Half Marathon

May 17, 2026

straighten

Distance — 21.1K

terrain

Type — Others, Running

timer

06:00

sell

$172.46

Marathon

May 17, 2026

straighten

Distance — 42.2K

terrain

Type — Others, Running

timer

06:00

sell

$189.26

Relay

May 17, 2026

straighten

Distance — 42.2K

terrain

Type — Others, Running

timer

06:00

sell

$413.24

Urban 10 miler

May 17, 2026

straighten

Distance — 16.1K

terrain

Type — Others, Running

timer

06:00

sell

$138.87

Weather History

These values represent the 3-year monthly averages for May in Denver.

thermostat Temperature

6.8° / 21.7°

wb_sunny Feels like

3.9° / 18.4°

light_mode Avg sunshine hours

11h 38m

water_drop Avg rainfall

2.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

8.5 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

High (6.0)

humidity_mid Humidity

54.6%

wb_twilight Sunrise

05:44

nightlight Sunset

20:08

About Denver

Learn more about the host city, Denver.

Denver is the capital of the western U.S. state of Colorado and the dominant city of the Rocky Mountain Region. Founded in 1858 as the placer gold mining camp known as the Cherry Creek Diggings, the "Mile-High City" is today the most populous city within a 560-mile (900 km) radius and the center of the Front Range Urban Corridor of more than five million residents. Denver embraces its cowboy and mining past but also looks toward the future with a vibrant arts and performing arts scene, dozens of great outdoor festivals, and distinct neighborhoods each offering a unique experience. You'll find everything a cosmopolitan city has to offer including a spectacular view of and easy access to the beautiful Rocky Mountains, which arise only 12 miles (19 km) west of the Colorado State Capitol.