How many times have you started off the year strong with your fitness goals, and then it hits spring and you wonder why you even had fitness goals in the first place? By training for a marathon or triathlon, you may keep your goals intact. We created a list of half marathons, marathons, triathlons (including sprint triathlons), and even fun runs for you to compete in. Now go on and get your run on!
Note: some of these races, particularly marathons and Ironman races, may require you to qualify with previous race times. So make sure to check before signing up.
All-Out Mardi Crawl
When: February 10, 9 a.m.
Where: 15600 W Morrison Rd, Lakewood
Cost: Before 1/27 $70 or $65 for “no swag”. After 1/27 it is $75 and $80 for walk up
The Lowdown: Grab some beads and start your year off right by running in the All-Out Mardi Crawl. Located at the base of Red Rocks Amphitheatre, this run benefits the American Lung Association. They have a 1 mile, 5K, 10K, and of course the half marathon. Plus the race offers breakfast tacos, bagels, and chocolate milk after the run.
Horsetooth Half Marathon
When: April 15, 8:30 a.m.
Where: Hughes Stadium- 2011 South Overland Trail, Fort Collins
Cost: January 7-February 28 $85, March 1-April 21 $95, packet pickup and race morning $110
The Lowdown: It’s definitely not the easiest course, but hey at least there is a downhill part to it and an after party with New Belgium Brewery. This will be the 45th running of the Horsetooth Half Marathon where you start at Hughes Stadium, the former home of the CSU Rams, and run along Horsetooth Reservoir. The hardest part of the race is running up “Monster Mountain” which is a 500-foot incline. If you want to challenge yourself while having a scenic view, this race is for you.
Three Creeks Half Marathon
When: April 22, 8 a.m.
Where: Hobie Hill group area, near the Cherry Creek Marina. Free runner parking will be available at Cherry Creek High School
Cost: December 1-January 31 $60, February 1-28 $65, March 1- April 10 $70, April 11-April 22 $75
The Lowdown: Run through Cherry Creek State Park with a mix of paved and dirt trails. Three Creeks Half Marathon offers a combined “elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek.” After the race, you will also receive a pancake breakfast!
Run the Rockies
When: June 2, 8 a.m.
Where: 1 West Main St., Frisco (parking will be here and a shuttle will take you to Copper Mountain)
Cost: Now-February 1 is $40, February 2 to May 1 is $50, May 2-June 2 is $60, Day of Registration is $65
The Lowdown: This will be the 42nd year of Run the Rockies that starts at Copper Mountain and ends at the Frisco Historic Park. All racers will get pizza from Peppino’s and a free beer from Backcountry Brewery or Outer Range Brewery. It is a beautiful run through the Rockies, but if you don’t plan on doing the half marathon they also offer a 10K too.
Boulder Rez Half Marathon
When: June 3, 7:15 a.m.
Where: Boulder Reservoir, 5565 N. 51st St., Boulder
Cost: Now-May 2 $90, May 3-June 3 $100, Race Day $105
The Lowdown: Run around Boulder Reservoir, where you can cool off after the race with a jump into the reservoir. The Boulder Rez Half Marathon features a course is flat with only 200 feet of elevation gain and has about 1,000 participants so make sure you register early. You will also receive a goody bag and post race food. They also offer a full marathon, 3/4 marathon, and a 10K.
Black Hawk Trail Half Marathon
When: July 22, 7 a.m.
Where: 9467 Drew Hill Rd. Golden
Cost: $75 with a shirt, $70 without a shirt
The Lowdown: If you are looking to challenge yourself with an uphill battle, this is the half marathon for you. Black Hawk Trail Half Marathon is one of the best “hill” courses that the “Endurance Series” has to offer, you will be running through Golden Gate State Park which is between Golden and Black Hawk. You will need to sign up for this race early since it has a max of 300 people.
Georgetown to Idaho Springs Half Marathon
When: August 11, 8 a.m.
Where: Georgetown Lake near Frontage Rd.
Cost: January 1-February 28 $50, March 1-April 30 $65, May 1-June 30 $75, July 1-July 31 $85, Aug 1-Aug 12 $105
The Lowdown: Starting at 8,500 feet at Georgetown Lake and descending to 7,500 feet to Idaho Springs, the Georgetown to Idaho Springs Half Marathon is a high altitude course that runs alongside Clear Creek Valley. Once you finish the race, you will be given a t-shirt and a medal, with an after-party at the Clear Creek Football field.
Golden Leaf Half Marathon
When: September 22, 8:30 a.m.
Where: 100 Elbert Ln, Snowmass Village
The Lowdown: The Golden Leaf was chosen by Trail Runner Magazine as one of “America’s 14 Most Scenic Races” and Colorado Runner Magazine’s “Best Half Marathon” in 2008. The course consists of mountain trails and paved roads, with a peak of 9,400 feet in elevation. If you’re looking for a run in the fall with a spectacular view, this one is for you!
Rock ‘n’ Roll Half Marathon
When: October 21, 7 a.m.
Where: 4655 Humboldt St., Denver
The Lowdown: Rock out while running in Denver’s Rock n’ Roll Half Marathon. The race starts and finishes at the Capital Building, and the race goes through Downtown Denver. Each mile marker has live bands, DJ’s, Drum Lines, and more. There is also a 10K or 5K option.
The Colorado Marathon
When: May 6, 6:30 a.m.
Vail Valor Marathon
When: May 28th, 8 a.m.
Where: Vail Village Rd., Vail
The Lowdown: Run for the Vail Veterans Program by participating in the sixth annual Vail Valor Marathon. The race is all on paved surfaces, which you will run through residential neighborhoods along with the Vail Bike Path. You can also participate in the half-marathon, 5-mile run/walk, and 1-mile.
When: June 3, 7:30 a.m.
Where: Routt County Courthouse-522 Lincoln Avenue
Cost: N/A till registration opens
The Lowdown: The Steamboat Marathon was ranked as one of the “Top 10 Destination Marathons in North America,” and it’s easy to see why. Run alongside the Elk River with gorgeous views of the Rocky Mountains, and before you know it you’ll be at the finish line.
Estes Park Marathon
When: June 17, 6 a.m., walkers must start at 5:30 a.m.
Where: The Dao House (formerly named Aspen Lodge), 6120 CO- Hwy 7
Cost: Now-March 31 $75, April 1- May 1 $785, May 2-June 1 $95, June 2-race day $110
The Lowdown: Run through Rocky Mountain National Park at the Estes Park Marathon. You’ll begin with a 1,500 feet descent within the first 6.5 miles. *Bonus* There will be massages available at the end of the race.
Aspen Valley Marathon
When: July 14, 6 a.m.
Where: Aspen Wagner Park-419 S Mill St. Aspen 81611
Cost:$139 will increase to $159 after March 14
The Lowdown: Run along the Rio Grande Trail which follows the Roaring Fork River all the way from Aspen to Basalt. Aspen Valley Marathon offers a marathon, half marathon and a 5K with a downhill drop of 1,418 feet in elevation from start to finish. The marathon was ranked the number one marathon in Colorado worth traveling for by Flipkey/Tripadvisor, so it is definitely something worth checking out.
Pikes Peak Marathon
When: August 19, 7 a.m.
Where: At the base of Pikes Peak in Manitou Springs-5089 Pikes Peak Hwy, Cascade
Cost: $190, registration opens March 10
The Lowdown: From Manitou Springs to the top of Pikes Peak, The Pikes Peak Marathon isn’t for the faint of heart. In fact, it is so physically demanding that all racers will need to qualify for it. If you are looking for a new challenge, and are an experienced runner then this is the marathon is for you.
Colorado Springs Marathon
When: September 30, 7 a.m.
Where: Acacia Park-115 E Platte Ave Colorado Springs
Cost: Now-March 29 $65, March 30-May 29 $80, May 30-Aug 29 $90, Aug 30-Sept 25 $100, Sept 26-Sept 29 $115, Sept 30-packet pickup $130
The Lowdown: The Colorado Springs Marathon begins and ends in Acacia Park, participants will run all over Colorado Springs including the Olympic training center, America the Beautiful Park, Memorial Park and even Colorado College. The race also offers a half marathon and a 5k, and all participants get a free shirt and a medal.
Castle Rock Trail Festival
When: October 6, 8:30 a.m.
Where: 1375 W Plum Creek Pkwy, Castle Rock
Cost: $80 through June 30, $85 July 1-Sept 15, $90 after Sept 15, $95 on race day
The Lowdown: Support the Castle Rock Parks and Trails Foundation, by running in the Castle Rock Trail Festival. The race also offers a half marathon, 50K, 10K, 5K and a family LiveBig Adventure Race.
Summer Open Sprint Triathlon
When: May 19, 7:45 a.m.
Where: 461 County Rd 26, Longmont
Cost: $80 January 1st – February 29th, $85 March 1st – May 13, $90 race week
The Lowdown: Start off this triathlon season, with the Summer Open Sprint Triathlon which features a half mile lake swim, a 12.9-mile flat loop, and a 3.9 mile run on a gravel road. There are only 500 competitors, so make sure to sign up soon since it has sold out from 2010-2017.
Ironman 70.3 Boulder
When: August 4, 7 a.m.
Where: Boulder Reservoir-5565 51st St., Boulder
Cost: Tier 2 $300, Tier 3 $325.00
The Lowdown: Check completing an Ironman off your list by participating in the Ironman 70.3 Boulder. Take a 1.2-mile loop swim around Boulder Reservoir, as well as a 56-mile bike and run 13.1 miles. All participants who register get a shirt, finisher medal, sling bag, finisher hat, luggage tag, timed race results, post race food and a post-race massage.
Boulder Sunrise / Sunset
When: June 24, 6 a.m. or August 25 at 6 a.m.
Where: Boulder Reservoir- 5565 N 51 St., Boulder
Cost: Olympic Triathlon-$110, $120, $130 Sprint Triathlon-$85, $95
The Lowdown: Swim through the Boulder Reservoir in the Boulder Sunrise. You have the option to participate in the sprint triathlon or the Olympic triathlon. The Olympic Triathlon includes .93 miles of swimming, 26.4 miles of biking, and 6.2 miles of running. The Sprint triathlon includes .47 miles of swimming, 17.3 miles of biking, and 3.1 miles of running. If you want to try one later in the season, there’s the Boulder Sunset triathlon, which takes place at the end of the season on August 25.
Boulder Peak Triathlon
When: July 8, 7 a.m.
Where: Boulder Reservoir-5565 N 51 St., Boulder
Cost: Now-March 31st $125, April 1st-July 1st $135, $145 race week (if not sold out)
The Lowdown: Boulder Peak Triathlon is listed as one of the “Top 15 Most Amazing Triathlons” by The Culture Trip, so this is for sure a triathlon you don’t want to miss out on. The course consists of a 1500 meter swim, 24.8-mile bike and a 10k run. The race is limited to only 900 competitors and has sold out 2010 to 2017.
When: July 14, 9 a.m.
Where: Frisco Bay Marina- 267 Marina Rd., Frisco
Cost: Now-February 28 $50, March 1-May 31 $60, June 1-July 13 $70, day of registration $75
The Lowdown: The Frisco Triathlon was named “Best Triathlon” in Elevation Outdoors Magazine‘s reader poll and takes a new spin on the typical triathlon by having stand-up-paddle boarding instead of swimming. You must provide your own paddleboard, however, if you don’t have one you can rent one locally. All participants will receive a post-race meal provided by Island Grill and a free beer from New Belgium Brewery.
Evergreen Sprint Triathlon
When: July 22, 7 a.m.
Where: Evergreen Lake House, parking is at 4019 Evergreen Pkwy
Cost: Now-January 31 $70, February 1-April 30 $75, May 1-July 8 $80, July 9-July 21st $85
The Lowdown: The Evergreen Sprint Triathlon is only 20 minutes away from Denver and consists of a 750-meter swim, 12-mile bike, and a three-mile run. All participants receive a shirt, a goody bag and a post race meal which includes breakfast burritos.
When: August 12, 8 a.m.
Where: Lake Catamount, Steamboat Springs
Cost: Now-Feb 28 $110, March 1-Aug 5 $120, race week $125
The Lowdown: The Steamboat Triathlon may be arguably one of the most scenic triathlons in Colorado where racers will start and finish in Lake Catamount. Swim 1.5k in Lake Catamount, bike 24.8 miles through Yampa Valley, and run 10k around Lake Catamount. It also features a sprint distance triathlon, aquabike and duathlon.
Oktoberfest Sprint Triathlon
When: September 23, 8 a.m.
Where: Union Reservoir, 461 County Rd. 26, Longmont
Cost: Now-April 30 $80, May 1-August 1 $85, August 2-September 16 $90, race week $95
The Lowdown: Finish off triathlon season strong with the Oktoberfest Sprint Triathlon which features a half mile lake swim, a 12.9 mile bike, and a 3.1 mile run. Only 600 participants are allowed so register early since the race has sold out for the past 10 years. All participants will receive a shirt and goodie bags.
Cupid’s Undie Run
When: Feb 24, 12-4 p.m.
Where: McNichols Civic Center Building- 144 W. Colfax Ave, Denver
The Lowdown: Strip down to your underwear, all for a good cause. Cupid’s Undie Run is about a mile run that benefits Neurofibromatosis, a genetic disorder that can cause tumors to grow anywhere on the body and affects 1 in every 3,000 children born. So, make sure to have a liquor blanket and run for a cure.
Runnin’ of the Green
When: March 11, 10:15 a.m. for 7K, 10:35 a.m. for 2 mile
Where: 18th and Wazee St., Denver
The Lowdown: The 30th annual Runnin’ Of The Green is coming so get ready to party. It is run/walk that has been voted the best post-race party and donates money to Volunteers of America. Deck out in your St. Patty’s gear and get ready to run.
Donut Dash 5K/10K
When: April 28, 7:15 a.m.
Where: City Park- 1700 N York St., Denver
Cost: 5K is $25, 10K is $35, Both is $45 (prices are before April 1st)
The Lowdown: With a course that is this flat and tons of doughnuts, this may be the most enjoyable race around. But we’re not talking about just once doughnut, all finishers will get a “sleeve of frosted donuts,” on top of a race logo shirt and finish line expo with vendors and food and yes, more doughnuts. The Donut Dash is both a 5K and 10K and will give back to charities, clubs, and organizations that create teams.
When: May 5, 7:30 a.m.
Where: Washington Park- 900 S Downing St., Denver
Cost: $50 before the event, $55 on event day
The Lowdown: Get to meet all the cute puppies and dogs that Denver has to offer at The Furry Scurry. This is a two-mile walk that benefits the pets and horses at the Dumb Friends League. There were also be some contest during the day such as the “Pet and Person Look-Alike Contest” and the “Best Pet Trick Contest”.
The Bolder Boulder
When: May 28, 6:50 a.m.
Where: 30th St. and Walnut, Boulder
Cost: Depends on what kind of shirt you want, for a short sleeve it starts at $50 for early registration then increases by $5
The Lowdown: Put on your craziest outfit, and participate in Boulder’s most entertaining runs, The Bolder Boulder. From mid-race slip ‘n slide, jello shots or an unexpected beer-and-bacon stop the race is a never-ending fun run. Racers will run through Pearl Street and finish at Folsom Field where you are greeted with a beer. This year the race turns 40 years old (or 40 years “bold” as they like to put it).
Margarita Madness 5K Run
When: June 30, 3-8 p.m.
Where: 6745 S Sante Fe Dr., Littleton
Cost: $25 for early bird registration, $45 after early bird
The Lowdown: A three-mile course, that ends with every racer drinking a margarita. The Margarita Madness 5K might be one of the best after parties to go to after a run, since they have a main stage with a live DJ playing and food trucks on site. You must be over 21 years old to register.
When: July 28, 8 a.m.
Where: Great Lawn Park Lowry, 101 N Yosemite St., Denver
The Lowdown: Run through three miles of foam with this fun run. The Bubble Run has four “Foam Bogs” so be ready to be covered head to toe in colored foam. There is no timing or placement awards, just make sure to bring a plastic bag for your phone.
When: August 25 and 26
Where: Aspen Snowmass- 60 Carriage Way, Snowmass Village
Cost: $115 (prices will go up)
The Lowdown: The Tough Mudder will feature 10 miles with 20+ obstacle courses. If the name isn’t obvious enough, prepare to get super down and dirty and maybe wear clothes you don’t really care about. Each participant will receive a t-shirt, a headband, and a nice cold beer after completing the race. Think it’s too intense? Sign up for the Tough Mudder Half Colorado.