Running Races in Denver
Denver sits at 5,280 feet of elevation, and that altitude advantage (or challenge) shapes everything about the running scene. Runners here are serious, fit, and tough. The race calendar takes full advantage of Colorado scenery with mountain views, trail races in the foothills, and fast road courses through the city. Train in Denver, race anywhere, and you will feel like you have a superpower.
Best Months
April to June, September to October
State
Colorado
Top Race
Colfax Marathon
Total Races
5+ featured
Major Races in Denver
Colfax Marathon
Marathon/HalfDenver signature marathon through City Park, Colfax Avenue, and Sloan Lake.
BolderBoulder 10K
10KOne of the largest 10Ks in the world. 50,000+ runners in nearby Boulder.
Denver Rock n Roll
Half/5KLive bands, flat course, great fall weather.
Run the Rocks
10K/5KRun through Red Rocks Amphitheatre. Steep, stunning, unforgettable.
Georgetown to Idaho Springs Half
Half MarathonDownhill mountain half in the Rockies. Fast and gorgeous.
Course Preview Video
Course Terrain
Flat in the city with foothill access 20 minutes west. Cherry Creek Trail and Platte River Trail are paved and mostly flat. Trail races nearby have serious elevation.
BolderBoulder Race Day Format
BolderBoulder runs as a wave start citizen race, with thousands of self seeded groups departing in staggered waves through the morning rather than one mass gun start. The race finishes with a lap inside Folsom Field at CU Boulder in front of a stadium crowd, a finish few other American 10Ks can match.
Colfax Marathon takes its name from Colfax Avenue, widely cited as the longest continuous commercial street in the country, and the course runs stretches of it alongside City Park and Sloan Lake rather than routing around the corridor the way many marathons avoid busy streets.
Logistics for Out of Town Racers
Because BolderBoulder takes place in Boulder rather than Denver proper, out of town entrants usually drive up Highway 36 race morning and need to plan around road closures that start hours before the first wave, since parking near the start fills early given the size of the field.
Colfax Marathon weekend also runs shorter distance options on the same closed course, which lets slower runners or first timers experience the altitude challenge over less than the full 26.2 miles without committing to the entire marathon.
Race Day Tips for Denver
Altitude matters. If you are visiting, arrive 2 to 3 days early and hydrate more than you think.
Denver sun is intense at elevation. Wear sunscreen and a hat, even in spring.
Morning temperatures can be 30+ degrees cooler than afternoon. Layer up and shed as you go.
The air is very dry. Increase your fluid intake starting a few days before your race.
This page covers the 5 races in Denver we track closely, but there is always more happening on any given weekend. If none of these fit your schedule, search for a race anywhere in the country using registration platforms, club calendars, and local resources.
Sharpening your speed before race day matters as much as picking the right course. If your training block calls for measured intervals, find a running track near you in Denver for accurate splits away from traffic and stoplights.
Running Clubs in Denver
Denver Running Club
Organized group runs across the city with pace groups for all levels.
Colorado Columbines
Competitive women running club based in Denver.
Runners Roost Racing Team
Elite and sub elite team connected to the local running store.
The clubs above are a starting point, not the full picture. For more ways to connect with training partners in Denver or anywhere else, see our guide to finding a running club.
Turn Your Denver Runs Into a Game
Train at altitude, capture territory at 5,280 feet, and build an empire across Denver. The thin air makes every Motera run count double.
MoteraExplore Denver Running Routes
Looking for where to train between races? Check out our full running guide for Denver with top routes, terrain info, and local tips.
Running in Denver GuideFrequently Asked Questions
Does altitude affect running in Denver?
Yes. At 5,280 feet, the air has about 17% less oxygen than at sea level. Visitors should expect to run 10 to 20% slower until acclimatized. Arrive early and hydrate heavily.
What is the BolderBoulder?
The BolderBoulder is a 10K race held on Memorial Day in Boulder, Colorado. With 50,000+ participants, it is one of the largest road races in the world. The course finishes inside Folsom Field at CU Boulder.
Are there mountain races near Denver?
Yes. Georgetown to Idaho Springs Half Marathon, Pikes Peak Ascent, Leadville 100, and dozens of trail races in the foothills and Rocky Mountains are all accessible from Denver.
What is the best race for beginners in Denver?
The Colfax Marathon weekend includes a 5K and 10K that are great for beginners. Turkey Trot races in November are also beginner friendly. Just remember the altitude if you are visiting.
When is running season in Denver?
Denver has year round running but the peak race season is April through October. Winters are cold but usually dry and sunny, so outdoor running is possible all year.
