Event details subject to change. Please confirm all information via event website.
Week of Events
High Lonesome 100
High Lonesome 100
The High Lonesome 100 is a high flying endurance race in the Sawatch range of the Colorado Rocky Mountains. With 22,500' of vertical gain and reaching an elevation of 13,150', it's a hell of a course. The race runs in a loop through some of the most beautiful single track in the state, and takes runners on the Continental Divide and Colorado Trail, through 2 ghost towns, over 5 alpine passes, through remote basins, and over soaring ridges. This year's event takes place on July 30th.
Sunday, July 12, 2026
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July 12, 2026 -Boulder Peak Triathlon
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July 12, 2026 -RMRR Stone House 2M
Boulder Peak Triathlon
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, […]
RMRR Stone House 2M
Everyone – slow, fast, or in-between – can win at RMRR Trophy Series races. With our handicap scoring system, we predict YOUR finish time based on recent running results, giving you a great goal to shoot for whatever your speed. Just show up an hour before the start and we’ll get you ready for your race. It’s an […]
Monday, July 13, 2026
No events on this day.
Tuesday, July 14, 2026
No events on this day.
Wednesday, July 15, 2026
No events on this day.
Thursday, July 16, 2026
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July 16, 2026Boulder Stroke & Stride VI
Boulder Stroke & Stride VI
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. Stroke & Stride happens weekly on Thursday nights throughout the Summer from June 4th to August 6th WITH THE EXCEPTION OF Thursday June […]
Friday, July 17, 2026
No events on this day.
Saturday, July 18, 2026
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July 18, 2026 -Audi Power of Four Trail Race
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July 18, 2026 -Summer Splash Prairie Dog Half Marathon
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July 18, 2026 -Silverton Alpine Marathon
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July 18, 2026 -Tri Boulder
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July 18, 2026 -Spring Creek Memorial Trail Run
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July 18, 2026 -Vail 10K and 5K @10,000 Feet
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July 18, 2026 -Gastro-Dash 10K
Audi Power of Four Trail Race
The Audi Power of Four Race Series is a premier endurance race series utilizing the unique and amazing terrain of each of the four Aspen Snowmass mountains. Each race is designed to test the limits and skills of both elite and recreational athletes. The event’s signature race is a challenging 50K Ultra is part of […]
Summer Splash Prairie Dog Half Marathon
Welcome to the Summer Splash Prairie Dog Half, 10k & 5k in Castle Rock, Colorado. Part of the Prairie Dog Half race series, join us in July as we race through Castle Rock along the East Plum Creek Trail.
Silverton Alpine Marathon
Experience the best of the San Juan Mountains with an 8 miler, a marathon, or a 50 kilometer run along the Alpine Loop past the historic mining ghost towns of Howardsville, Eureka, Animas Forks & Gladstone. High point is 12,930 ft atop California Pass. Low point is Silverton at 9,318ft. Total vertical gain is 3,800 […]
Tri Boulder
‘The Beast’ Long Course distance will be back for its second year! As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day. Take in the natural beauty of the mountain backdrop that sets the scene for this iconic race destination. Most of the bike […]
Spring Creek Memorial Trail Run
This race is held in memory of Patty Brenner Hagberg who was struck and killed by a truck along the lower part of the trail in 1991. This race should remind all of us the importance of sharing multi-purpose use trails. The race is held on the beautiful Spring Creek trail with wildflowers and Aspen […]
Vail 10K and 5K @10,000 Feet
Vail Mountain's Views Won't be the Only Thing Taking Your Breath Away! The 10@10 returns to its original route on Grand Traverse. The race starts 10,000 feet above sea level, on the beautiful Vail Mountain. Racers will be challenged as they traverse over Vail Mountain and across the legendary back bowls of Vail. The average grade of the […]
Gastro-Dash 10K
The Berthoud Gastro-Dash 10K is not just a footrace; it’s an epic, hilarious test of both speed and stomach, challenging runners to tackle a 6.2-mile course punctuated by mandatory food consumption directly from Berthoud’s finest local kitchens and small businesses. We invite runners from across the Front Range and beyond to descend upon our charming […]
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