Saturday, May 26
Iron Horse Bicycle Classic — More than 2,000 bicyclists race from Durango to Silverton. Various locations, 970-259-4621 or www.ironhorsebicycleclassic.com.
Monday, May 28
BolderBoulder — America’s favorite 10K race creates a full day of fun for all, from walkers to elite athletes. Races finish at CU’s Folsom Field. Pro Wheelchair wave kicks off at 6:55 a.m. with elite men’s race expected to finish at the stadium around 11:30 a.m. For information go to www.bolderboulder. com.
Saturday, June 2
Mountaineer Marathon — Halfmarathon, proceeds to go to Lake City Community School sports program. Lake City Town Park, Lake City, lakecitymarathon.com. Boulder Sunrise — 5K run, triathlon, duathlon, Boulder www. yourcausesports.org/events/bouldersunrise. Sunday, June 3
Road to Victory Bicycle Classic for Parkinson’s — Fun ride to benefit the Davis Phinney Foundation. Goose Creek Path, Boulder, 720-514- 3244.
Friday, June 8
Outside in Aspen — An adventure weekend of outfitter-led mountain and road biking, fly fishing, kayaking, rafting, trail running, hiking, rock climbing and stand-up river paddling. Base Camp at Gondola Plaza, Aspen Mountain, outsideinaspen.com. Through June 12.
Saturday, June 9
Palisade Classic Mountain Bike Race. Rapid Creek Cycles, 237 S. Main St., Palisade, 970-260- 5848, rapidcreekcycles.com.
Run the Rockies — 5k run/walk, 10k and halfmarathon. Frisco Recreation Building, Third Street and Main Street, Frisco, 303-635-2815 or www. emgcolorado.com/race_rockies.htm.
Saturday, June 16
Estes Park Marathon — A kids’ fun run, halfmarathon and full 26.2-miler on the highest paved course in the world. Estes Park Middle School, 1500 Brodie Ave., Estes Park, 970-586-8191, ext. 5, or www.epmarathon.org. Through June 17.
G’Knight Ride — 1-, 3- and 10-mile cruiser bike rides on greenways through Longmont, kids festival (3-7 p.m.), music, food, beer garden by Oskar Blues Brewery, Expo. Ride starts at 5 p.m. Prospect Park in Prospect New Town, Longmont, 731 Tenacity, 303-319-9882.
Mt. Evans Ascent — The race that starts at an elevation of 10,600 feet at Echo Lake, then climbs nearly 4,000 vertical feet to the top of Mt. Evans at 14,264 feet in elevation. Mt. Evans, Idaho Springs.
Sunday, June 17
5430 Sprint Triathlon — 5430 Sprint Triathlon, Boulder Reservoir, Boulder, 0.5-mile swim, 17.2-mile bike, 3.1-mile run. Details at bouldersprint.com.
Wednesday, June 20
Solstice Swim — 6 p.m., Union Reservoir, County Line Road 1, Longmont.
Thursday, June 21
Crested Butte Bike Week — A three-day event “to celebrate all things bike." Various locations, Crested Butte, 800-545-4505 or gunnisoncrestedbutte.com.
Saturday, June 23
Avon Walk for Breast Cancer — Walk from Keystone Resort to Breckenridge to raise awareness of breast cancer. 6:30 a.m. 211 Keystone Road, Keystone, www.avonwalk.org/rocky-mountains/ event-information.html. Through June 24.
ByOB Race — Build Your Own Boat Race, part of the Royal Gorge Whitewater Festival. 5:15 p.m., Centennial Park Boat Launch, Cañon City, royalgorgewhitewaterfestival.com.
Creek on the Peak Race and Festival — One of the country’s top downriver raft and kayak races. This year’s race has been selected as the U.S. Nationals Raft Race, and teams from all over the country will be competing for the title of national champions. Food and drinks, live music, and vendors. The ball fields, Idaho Springs, www.creekatthepeak.com. Through June 24.
Lap the Lake Race/Ride — One of the country’s highest road bike races, at 9,650 to 10,800 feet. Lake County Swimming Pool, 1000 W. 6th St., Leadville, 719-486-7484 or lakecountyco.com.
San Juan Solstice 50-mile Run — 50 miles of sheer perseverance through Alpine Gulch, Williams Creek, Carson, the Continental Dive and Slumgullion Pass that ends with a final stretch through Vickers Ranch plateau. Limited to 200 qualified runners. All proceeds benefit the Lake City EMTs. Lake City, www.lakecity50.com.
Saturday, June 30
Leadville Trail Marathon and Leadville Trail Heavy Half Marathon — Race on old mining roads and trails, topping out at 13,185 feet on Mosquito Pass. Start at the Sixth Street Gym, 124 E. 6th St., Leadville, leadvilleraceseries.com.
Sunday, July 8
Boulder Peak Triathlon — Race starts at 6 a.m. at Boulder Reservoir, Boulder, for more information and registration go to 5150boulder.com.
Monday, July 9
Triple Bypass Bicycle Tour — A 120-mile bike ride with more than 10,000 feet of elevation gain. The ride begins in Evergreen and ends in Avon. This year, a Double Triple has been arranged, which means riders can ride from Avon back to Evergreen the next day. 12-8 p.m. Harry A. Nottingham Park, Avon, teamevergreen.org. Through July 10.
Tough Mudder — A 10-12-mile obstacle course designed by British Special Forces to test strength, stamina and sanity. In support of the Wounded Warrior Project. Beaver Creek, toughmudder.com.
Friday, July 13
Hardrock Hundred Endurance Run — The 19th Annual Hardrock 100. The 100-mile course will be run clockwise — a big loop through the San Juan Mountains of southwest Colorado. The route includes 33,992 feet of climb and 33,992 feet of descent for a total elevation change of 67,984 feet. The run is a salute to the toughness and perseverance of the hardrock miners who lived and worked in the area. 6 a.m. Race begins and ends at the Kendall Mountain Recreation Center, 1 Kendall Pl., Silverton, 970-387- 0182. Through July 15.
Master of the Mass Snowmass Enduro — A three-day, four-stage event that tests all the attributes of a mountain biker. Snowmass Village, snowmassvillage.com.
Saturday, July 14
Triple Bypass Bicycle Ride — Golden, two races on two days, June 14 or 15, or you can do both, www.triplebypass.org.
Silver Rush 50 Mountain Bike Race — Just half of the Leadville 100. The tough half. Cloud City Ski Hut, Highway 24, Leadville, leadvilleraceseries.com.
Thursday, July 19
West End 3K — 6 p.m., 11th and Pearl, Boulder, distances: adults 3K, kids 1,500 meters. More information at www.5430sports.com/west-end-3k.
Saturday, July 21
2nd Annual Treadfest — A mountain bike fundraising event benefiting the National Sports Center for the Disabled and the American Red Cross. Bikers of all levels are welcome for a weekend of incredible trails, live entertainment, meals and great memories. Winter Park Resort, 85 Parsenn Road, Winter Park, 970-726-1540.
Saturday, July 28
Race Across America Cycling Challenge — Races are solo, two- and four-person teams. Start time 12 p.m., three non-competitive rides 30, 60 and 120 miles, two endurance races 200 and 400 miles, expo and post-event party with awards, entertainment, food and drink. Prospect Park, Longmont, www.raamchallenge.com.
Sunday, August 5
Ironman 70.3 Boulder — The last leg in the Boulder Triathlon Series, which was voted Competitor magazine’s “Best Triathlon” in the Mountain West region. Start with the swim at Boulder Reservoir, Boulder. Details at bouldertriseries.com.
Thursday, August 9
Pearl Street Mile — 6 p.m. 14th & Pearl on the Mall just east of the courthouse near the Cheesecake Factory, Boulder. Distances: adults one mile, kids 800 meters. More info at www.5430sports.com/pearlstreet-mile. Saturday, August 11
Leadville Trail 100 Mountain Bike Race — 100 miles of high-altitude extreme terrain. Start at 6th and Harrison, Leadville, leadvilleraceseries.com.
Sunday, August 12
North Boulder Park Classic — This is an all-day celebration featuring running and cycling criterion races, kids events, expo and more. North Boulder Park, Boulder, for details www.boulderclassic.net.
Saturday, August 18
Boulder Nites Classic Bicycle Ride — This community event is a fun, family bike ride through the streets of Boulder that serves as a fundraiser. 5:30 p.m. to 9:30 p.m., with an expo opening at 5:30 and first wave starting at 7 p.m. Twenty Ninth Street Mall, 1710 29th St., Boulder,
Circle the Summit — Bicycle race through the Ute Pass. Third Avenue and Main Street, Frisco, www. circlethesummit.com.
Sunday, August 19
Race Across the Sky — Leadville Trail 100 Run. Race starts from 6th and Harrison Streets, Leadville,
Saturday, August 25
The 32nd Annual Eldorado Springs Cure — This is the oldest benefit race in Colorado. The course is a great four-mile out-and-back loop running through the canyon, and there’s also a half-mile Kids Fun Run for ages 10 and under. 6:30 p.m., Eldorado Springs Resort, Eldorado Springs. For more info http://bit.ly/ JU9lQ3.
Sunday, August 26
Venus de Miles — An all-women’s road cycling event, a celebration of sisterhood, crazy fun — but not a race. So walk your bike up that hill, listen to a band, and enjoy yourself. 7 a.m., Prospect Park, Longmont, 303-859-3317, www.venusdemiles.com.
Saturday, September 1
Coal Creek Crossing 5k, 10-mile and kids fun run — Register at www.LouisvilleRecreation.com. For information call 303-335-4903.
Open Water Swim — Racing Underground event. 1.2-mile or 2.4-mile open water swim, mass or single start — chip timed. Post-race food and raffles. Park entry paid for each athlete. 6:30 a.m., Boulder Reservoir, 5565 North 51st Street, Boulder, 303- 642-7917.
Thursday, September 6
Sunrise Stampede 10K and 2 mile run/walk — Longmont High School, 11th and Francis Streets, Longmont, Starts at 10:30 a.m.