Snow Mountain Stampede Classic Races, GCNRS #8
2026-03-08 | Snow Mountain Ranch, 1101 Co Rd 53, Granby, CO, 80446, United States
Venue: Snow Mountain Ranch Nordic trails. Race HQ will based out of the Camper’s Hub building.
Event: Classic, Long Course 50km, Short Course 25km, 12.5km (not series eligible), Junior 3km.
Course: Fun, challenging courses that showcase the world class skiing and beauty of Snow Mountain Ranch Nordic! The 50km course will be 2 laps of a 25km loop. The 12.5km and 3km course will be mostly independent of the long course and will offer a great alternative for those who want a slightly less challenging day.
Start Time: 9am Long Course, 10am Short course
Registration: Closes the day of the event

Coke Race #2
2026-03-08 | Durango Nordic, 49786 U.S. 550, Durango, 81301, United States
This long-standing Durango tradition brings skiers together to celebrate winter from start to finish!
Race Options:
9K (Adults)
3K (Kids)
1.5 (Kids

Frisco Gold Rush
2026-03-14 | Frisco Nordic Center, 616 Recreation Way, Frisco, CO, United States
The Annual Frisco Gold Rush is the longest running Nordic event in Colorado, and consists of classic and skate races open to skiers of all ages and abilities. Gold Rush is where the past and present come together to celebrate our historical mining heritage and embrace our snowy Nordic culture.
KIDS 1K FUN SKI
5K SKATE SKI
10K SKATE OR CLASSIC
20K SKATE SKI

Vail Nordic Town Series Race
2026-03-21 | Maloit Park in Minturn, Minturn, United States
The Vail Nordic Town Series Races are put on by the Ski & Snowboard Club Vail. Skiers of all ages and abilities are welcome to attend!
Day-of, on-site registration | $5 for 1K & 3K races, $10 for 5K and up

Three Creeks Half Marathon
2026-04-05 | Bear Creek Lake Park (Lakewood), 15600 W. Morrison Road, Lakewood, CO, 80228, United States
Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fast and scenic!
Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total 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 on a mix of road, paved running trail, and wide dirt trails.

Boulder Rez Half
2026-04-11 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
This spring race features a spectator-friendly Half Marathon, 10K and 5K course. Attracting athletes from all over the west due to its phenomenal scenery, glamorous finisher medals, perfect running temperatures with many nearby Boulder attractions to enjoy after the race.
The run course loops around the Boulder Reservoir and remains mostly on dirt trails. The course is flat with only 200 feet of elevation gain. You will experience iconic views of the mountain range to the west.
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The Half Marathon will complete 2 loops, and the 10K will complete one loop. 5K runners will take a different course route.
The Half Marathon is now a USAT Certified Course.

NOCO Half Marathon & 10K
2026-04-25 | Boyd Lake State Park (Loveland), 3720 N County Road 11-C, Loveland, CO, 80538, United States
Spring is the season of renewal and running. We hope you join us for a fun adventure that embodies the spirit of springtime at the beautiful Boyd Lake State Park!
Choose from the Half Marathon (13.1 mile) or 10K (6.2 mile) for your run adventure. This course is on smooth paved walkways with about three quarters of a mile being off road. Beautiful lake and wildlife views and fun post race festivities. Did we mention almost no elevation gain? This is one flat course making sure you’ll set a new PR or enjoy a fun steady-paced morning run race

Harvest Moon Long Course Triathlon
2026-05-31 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
The Harvest Moon Half Distance Triathlon: This event takes place at the beautiful Boulder Reservoir on May 31st, 2026 and we couldn’t be more excited to be back for another year. Est. in 2000 this Colorado classic provides the veterans to beginners a challenging, affordable, and competitive race with a local flavor. Whether this is your first event of the season, or a tune-up for a summer long course triathlon, don’t miss the Harvest Moon! The Aquabike portion is one of the fastest growing Aquabikes in the nation, while the duathlon is Colorado’s only long-course duathlon.

Stroke & Stride
2026-06-04, 2026-06-10, 2026-06-18, 2026-06-25, 2026-07-09, 2026-07-16, 2026-07-23, 2026-07-30 and 1 more date | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
The Boulder Stroke & Stride offers Boulder area athletes a fun 1-lap 750 Meter Swim, or 2-Lap 1500 Meter swim in Boulder Reservoir, followed by a 5k run on the reservoir dam on 8 Thursday evenings (plus one Wednesday evening) throughout the summer. Many participants make their open-water swimming debut in the beginner-friendly Stroke & Stride 750 meter event, while more seasoned athletes get the thrill of starting alongside some of the top athletes in the world in the 1,500 meter swim. 250-400 participants enjoy the Stroke & Stride every week! Live timing, great post race food, beanie for 6-pack entries, and series prizes are just the beginning!

Colorado Triathlon
2026-06-06 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
Colorado Sprint Triathlon: 750 meter swim, rolling and fast 17 mile bike, and finishes with a 3.1 mile run
Colorado Olympic Triathlon: 1500m swim, 23.5 mile bike, and a 10k run
Colorado Olympic Duathlon: 5k run, 23.5 mile bike, and a 10k run
Colorado Aquabike: Will feature a 1500 meter swim and a 24.8m bike

IRONMAN 70.3 Boulder
2026-06-13 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
Presale Registration for 2023 IRONMAN 70.3 Boulder opens at 10am MT on Thursday, August 4, 2022.

XTERRA Lory
2026-06-20 | Lory State Park (Fort Collins), 708 Lodgepole Drive, Bellvue, CO, 80512, United States
XTERRA Lory Triathlon on June 18th is the perfect kick-off to the year for the seasoned off-road triathlete, or a great opportunity for the road triathlete wanting to try out a mountain bike triathlon for the first time.
The XTERRA Lory Triathlon features a 1/2 mile swim in the clear waters of Horsetooth Reservoir (Eltuk Bay), it’s one of the most scenic swims in the state with canyon walls on both sides. Then it’s on to a 2-Lap (beginner friendly) 12.2 mile single-track bike over rolling terrain, and across valley bridges at Lory State Park. Then you’ll get to finish things off with a fun and challenging 4.8 mile (8k) run through the clouds on single-track trails! This is the perfect off-road triathlon for beginners to experts. The course is designed so that anyone can have fun and everyone will be challenged! Entries will be limited to 350 participants, and we sold out 2011-2021 in early April!
BACK FOR 2022: Stand Up Paddleboard Option instead of the 1/2 mile swim (you must bring your own SUP)!

Loveland Lake to Lake Triathlon
2026-06-27 | North Lake Park (Loveland), 2750 N. Taft Ave., Loveland, CO, United States
This event provides a beautiful venue. The transition area and lake are near North Lake Park. North Lake Park is a nice setting for competitors and families. It has a children’s train that operates throughout the day and is adjacent to Benson Sculpture Park, which is the site of Loveland’s annual Sculpture in the Park each August.

Timberview Trail Run
2026-06-27 | Boyd Lake State Park (Loveland), 3720 N County Road 11-C, Loveland, CO, 80538, United States
Crisp morning air and a summer sunrise in Colorado. YES PLEASE! Join us on the foothills at Lory State Park for a fun & beautiful morning trail race experience.
This run race features three distances (a 10 mile, a 5 mile and a 5K) that are great for just about any level athlete at any age. Run on a beautiful & scenic course among the treetops with views of Horsetooth reservoir, Fort Collins & the foothills. Bring the kiddos too as the 5K route is very beginner friendly.

Boulder Sunrise Triathlon
2026-06-28 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
Kick off your summer of racing in Boulder.

The Blue Sky Ascent
2026-06-28 | Idaho Springs, Idaho Springs, United States
Although the air will be noticeably thin at the starting line, Echo Lake’s 10,600 feet of elevation is just the beginning. The climb totals nearly 4,000 vertical feet – much of it above treeline – as you make your way 14.5 miles to the finish line located at the summit of one of the most recognizable peaks on Denver’s mountain skyline – 14,264 foot Mt. Blue Sky.
Be inspired!!!
Join us for another memorable run. Spectators will include Bighorn Sheep, Marmots, and Mountain Goats – maybe even a few people!!!

LG Triathlon
2026-07-11 | Gypsum, Gypsum, CO, United States
Join us for the Annual LG Tri, a sprint triathlon in the beautiful Vail Valley town of Gypsum, Colorado. The course features a 500-yard open water swim, a 12-mile bike ride, and a 5K run. Adults can race as individuals or form a team. We’re also running the 12th annual Kids Tri, so bring the whole family! We’re excited to collaborate with the Siena Valley Club neighborhood — just a short drive from Eagle County Airport.

Boulder Peak Triathlon
2026-07-12 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
The Boulder Peak Triathlon, Duathlon & Aquabike on July 10th is one of the countries longest and most well-known triathlons. For the veteran or first time racer, this is THE can’t miss event of the summer triathlon season, and the crown jewel of the Colorado Triathlon Series. Racers are tackling the infamous “Olde Stage” Hill, boasting an average 15% grade on their way to the finish line! This race has earned it’s spot on more than a couple notable “Best Triathlons in America” lists. In 2017, the Boulder Peak was listed as one of the top 15 most amazing triathlons in the United States by The Culture Trip!

Tri Boulder
2026-07-18 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day! Join us for a full day of racing at the Rez.

Steamboat Lake Triathlon
2026-07-26 | Steamboat Lake State Park, 61105 County Road 129, Clark, CO, 80428, United States
After last summer this event instantly became a personal favorite for our staff, volunteers, and athletes – come find out why! We couldn’t be more excited about this course, this lake, and the overall experience. The swim starts out in the surprisingly warm waters of Steamboat Lake (74 degrees average race temp), then athletes transition to the most scenic bike course you’ll ever find. You’re more likely to see a herd of cattle crossing the road than be passed by a vehicle! After a ride through the rolling country-side athletes will transition to a 3.5 mile run course that’s 50% on road, and 50% on the dirt trails that hug the lakeside. When we tell athletes you’re running through wild flower meadows, we’re not exaggerating.
Pack the camping gear and make a weekend getaway for your all your friends and family! This year we’re also offering a aquabike, and stand-up paddle-board division!

Stagecoach Gravel Triathlon
2026-08-02 | Stagecoach Reservoir (Steamboat Springs), 25500 County Road 14, Oak Creek, CO, 80467, United States
We didn’t get the chance to launch this race in 2020, but that didn’t diminish our passion for this brand new style of triathlon! To say this race is “unique” would be an understatement! Limited to just 250 athletes, we’re excited to announce the first ever gravel triathlon to the Colorado triathlon landscape! This event is set at Stagecoach Reservoir, a quiet and picturesque lake just 15min south of Steamboat Springs, with camping options for the entire family.
After the swim in the waters of Stagecoach Reservoir, it’s time to bring out either the gravel bike, road bike, or mountain bike. Just leave your triathlon bike at home. The course starts out with a short-paved section of 2.1 miles, before transitioning to rolling gravel country roads through some of the most scenic terrain imaginable. The total bike distance is 16 miles, with the final 3 miles of the course on pavement as athletes head back towards the transition area! Once off your bike of choice, it’s time to toss on those running shoes for a 4-mile run on a gravel trail that hugs the shoreline of Stagecoach Reservoir, (Note: ½ mile total on paved roads)! Come join us for this one of a kind triathlon experience, complete with a stand-up paddle-board option for the non-swimmers!

Tri Boulder
2026-08-09 | Boulder Reservoir, 5275 Reservoir Road, Boulder, CO, 80301, United States
Rocky Mountain Tri-Fest was established in 2023 to cater to the whole family. With events for everyone from mom and dad looking to try their hand at a gravel triathlon, to children looking to do their first triathlon.
The Sprint and Super Sprint gravel Tris are beginner friendly with the bike course on the gravel roads surrounding the reservoir. The road are graded and smooth, so you can use almost any bike, even a road bike with wide tires.
The Mini and SSS were created for the younger members of the family, but adults are more than welcome to tag along. These distance take place entirely inside the reservoir, and are 100% about having fun.
We are super excited to be able to offer the kids race for free in 2025. We hope that this will allow more families to join and an introduce this great sport to their children. Use code Rockymountainkids on the USAT membership link to take advantage of a free day license for you children as well.
What bike do you recommend? Do I have to use a “gravel” bike? The simple answer is you can race this course on a mountain bike, on a “gravel” bike, on a cyclocross bike, or even on a road bike with a minimum of 25mm tires and low psi. A tribike and disc wheel would be a little tricky.
For the kids races, anything goes Strider, tricycle, bmx, mountain bike, etc. Please make sure they have a helmet.
