Taking place on May 15–17, 2026, the Cigna Denver Colfax Marathon marks the 20th anniversary of the Rockies’ largest running weekend—featuring a robust lineup of races: a marathon, half marathon, urban 10-mile run, 5K, and both corporate and open marathon relays, plus an expo at Empower Field at Mile High. The marathon and half courses weave through Denver’s most vibrant neighborhoods, taking runners through Mile High Stadium twice, alongside the Denver Zoo, Fire Station No. 1, Cherry Creek, Sloan’s Lake, and multiple city landmarks with panoramic mountain views. As a Boston Marathon qualifier and one of the largest marathon weekends in the U.S., the event draws over 25,000 participants, offering a festival-like atmosphere with post-race celebrations, live music, and engaging course elements.
Races
Marathon
Marathon
Half Marathon
10 miles
5 km
Race Date:
17 May, 2026
The Full Marathon takes place on Sunday, 17 May 2026, beginning and ending in City Park and featuring two passes through Empower Field at Mile High, as well as riverfront, lake, and downtown segments—organized by the Colfax Marathon Partnership.
Race Date:
17 May, 2026
Also on Sunday, 17 May 2026, the Marathon Relay lets teams of five complete the 26.2-mile course in segments, with divisions for Open, Corporate, Government, and Public School Teachers. This event is run by the Colfax Marathon Partnership.
Race Date:
17 May, 2026
Held on Sunday, 17 May 2026, the Half Marathon offers a unique course through Denver, including a memorable mile through the Denver Zoo, organized by the Colfax Marathon Partnership.
Race Date:
17 May, 2026
Also on Sunday, 17 May 2026, the Urban 10 Miler travels from Denver’s Empower Field at Mile High through downtown and Cherry Creek before finishing in City Park, presented by the Colfax Marathon Partnership.
Race Date:
16 May, 2026
The Colfax 5K kicks off the weekend on Saturday, 16 May 2026, at City Park, Denver, organized by the Colfax Marathon Partnership. This family-friendly race welcomes runners and walkers of all abilities to join the Mile-High City’s biggest running celebration.
Weather based on historical averages.
FAQs
What is the Cigna Denver Colfax Marathon?
How long is the Cigna Denver Colfax Marathon?
Where does the Cigna Denver Colfax Marathon take place?
What is the elevation gain of the Cigna Denver Colfax Marathon?
How can I prepare for the Cigna Denver Colfax Marathon?
How do I choose the right training plan for the Cigna Denver Colfax Marathon?
The Full Marathon takes place on Sunday, 17 May 2026, beginning and ending in City Park and featuring two passes through Empower Field at Mile High, as well as riverfront, lake, and downtown segments—organized by the Colfax Marathon Partnership.
The Cigna Denver Colfax Marathon is 42km long.
The Cigna Denver Colfax Marathon takes place in Denver, CO, USA.
Runna classifies the Cigna Denver Colfax Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Marathon?
The Full Marathon takes place on Sunday, 17 May 2026, beginning and ending in City Park and featuring two passes through Empower Field at Mile High, as well as riverfront, lake, and downtown segments—organized by the Colfax Marathon Partnership.
How long is the Cigna Denver Colfax Marathon?
The Cigna Denver Colfax Marathon is 42km long.
Where does the Cigna Denver Colfax Marathon take place?
The Cigna Denver Colfax Marathon takes place in Denver, CO, USA.
What is the elevation gain of the Cigna Denver Colfax Marathon?
Runna classifies the Cigna Denver Colfax Marathon elevation profile as Flat.
How can I prepare for the Cigna Denver Colfax Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cigna Denver Colfax Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Marathon Relay?
How long is the Cigna Denver Colfax Marathon Relay?
Where does the Cigna Denver Colfax Marathon Relay take place?
What is the elevation gain of the Cigna Denver Colfax Marathon Relay?
How can I prepare for the Cigna Denver Colfax Marathon Relay?
How do I choose the right training plan for the Cigna Denver Colfax Marathon Relay?
Also on Sunday, 17 May 2026, the Marathon Relay lets teams of five complete the 26.2-mile course in segments, with divisions for Open, Corporate, Government, and Public School Teachers. This event is run by the Colfax Marathon Partnership.
The Cigna Denver Colfax Marathon Relay is 42km long.
The Cigna Denver Colfax Marathon Relay takes place in Denver, CO, USA.
Runna classifies the Cigna Denver Colfax Marathon Relay elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Marathon Relay?
Also on Sunday, 17 May 2026, the Marathon Relay lets teams of five complete the 26.2-mile course in segments, with divisions for Open, Corporate, Government, and Public School Teachers. This event is run by the Colfax Marathon Partnership.
How long is the Cigna Denver Colfax Marathon Relay?
The Cigna Denver Colfax Marathon Relay is 42km long.
Where does the Cigna Denver Colfax Marathon Relay take place?
The Cigna Denver Colfax Marathon Relay takes place in Denver, CO, USA.
What is the elevation gain of the Cigna Denver Colfax Marathon Relay?
Runna classifies the Cigna Denver Colfax Marathon Relay elevation profile as Flat.
How can I prepare for the Cigna Denver Colfax Marathon Relay?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cigna Denver Colfax Marathon Relay?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Half Marathon?
How long is the Cigna Denver Colfax Half Marathon?
Where does the Cigna Denver Colfax Half Marathon take place?
What is the elevation gain of the Cigna Denver Colfax Half Marathon?
How can I prepare for the Cigna Denver Colfax Half Marathon?
How do I choose the right training plan for the Cigna Denver Colfax Half Marathon?
Held on Sunday, 17 May 2026, the Half Marathon offers a unique course through Denver, including a memorable mile through the Denver Zoo, organized by the Colfax Marathon Partnership.
The Cigna Denver Colfax Half Marathon is 21km long.
The Cigna Denver Colfax Half Marathon takes place in Denver, CO, USA.
Runna classifies the Cigna Denver Colfax Half Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Half Marathon?
Held on Sunday, 17 May 2026, the Half Marathon offers a unique course through Denver, including a memorable mile through the Denver Zoo, organized by the Colfax Marathon Partnership.
How long is the Cigna Denver Colfax Half Marathon?
The Cigna Denver Colfax Half Marathon is 21km long.
Where does the Cigna Denver Colfax Half Marathon take place?
The Cigna Denver Colfax Half Marathon takes place in Denver, CO, USA.
What is the elevation gain of the Cigna Denver Colfax Half Marathon?
Runna classifies the Cigna Denver Colfax Half Marathon elevation profile as Flat.
How can I prepare for the Cigna Denver Colfax Half Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cigna Denver Colfax Half Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Urban 10 Miler?
How long is the Cigna Denver Colfax Urban 10 Miler?
Where does the Cigna Denver Colfax Urban 10 Miler take place?
What is the elevation gain of the Cigna Denver Colfax Urban 10 Miler?
How can I prepare for the Cigna Denver Colfax Urban 10 Miler?
How do I choose the right training plan for the Cigna Denver Colfax Urban 10 Miler?
Also on Sunday, 17 May 2026, the Urban 10 Miler travels from Denver’s Empower Field at Mile High through downtown and Cherry Creek before finishing in City Park, presented by the Colfax Marathon Partnership.
The Cigna Denver Colfax Urban 10 Miler is 16km long.
The Cigna Denver Colfax Urban 10 Miler takes place in Denver, CO, USA.
Runna classifies the Cigna Denver Colfax Urban 10 Miler elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax Urban 10 Miler?
Also on Sunday, 17 May 2026, the Urban 10 Miler travels from Denver’s Empower Field at Mile High through downtown and Cherry Creek before finishing in City Park, presented by the Colfax Marathon Partnership.
How long is the Cigna Denver Colfax Urban 10 Miler?
The Cigna Denver Colfax Urban 10 Miler is 16km long.
Where does the Cigna Denver Colfax Urban 10 Miler take place?
The Cigna Denver Colfax Urban 10 Miler takes place in Denver, CO, USA.
What is the elevation gain of the Cigna Denver Colfax Urban 10 Miler?
Runna classifies the Cigna Denver Colfax Urban 10 Miler elevation profile as Flat.
How can I prepare for the Cigna Denver Colfax Urban 10 Miler?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cigna Denver Colfax Urban 10 Miler?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax 5K?
How long is the Cigna Denver Colfax 5K?
Where does the Cigna Denver Colfax 5K take place?
What is the elevation gain of the Cigna Denver Colfax 5K?
How can I prepare for the Cigna Denver Colfax 5K?
How do I choose the right training plan for the Cigna Denver Colfax 5K?
The Colfax 5K kicks off the weekend on Saturday, 16 May 2026, at City Park, Denver, organized by the Colfax Marathon Partnership. This family-friendly race welcomes runners and walkers of all abilities to join the Mile-High City’s biggest running celebration.
The Cigna Denver Colfax 5K is 5km long.
The Cigna Denver Colfax 5K takes place in Denver, CO, USA.
Runna classifies the Cigna Denver Colfax 5K elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cigna Denver Colfax 5K?
The Colfax 5K kicks off the weekend on Saturday, 16 May 2026, at City Park, Denver, organized by the Colfax Marathon Partnership. This family-friendly race welcomes runners and walkers of all abilities to join the Mile-High City’s biggest running celebration.
How long is the Cigna Denver Colfax 5K?
The Cigna Denver Colfax 5K is 5km long.
Where does the Cigna Denver Colfax 5K take place?
The Cigna Denver Colfax 5K takes place in Denver, CO, USA.
What is the elevation gain of the Cigna Denver Colfax 5K?
Runna classifies the Cigna Denver Colfax 5K elevation profile as Flat.
How can I prepare for the Cigna Denver Colfax 5K?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cigna Denver Colfax 5K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Qualifier:
Boston Marathon Qualifier
Tags:
Boston Marathon Qualifier
Relay
Park
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Cigna Denver Colfax Marathon 2026 or Colfax Marathon Partnership. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Cigna Denver Colfax Marathon 2026 website.
