FRIDAY, MAY 24
Iron Horse Bicycle Classic. Watch or compete as bikers race the train to Silverton — 50 miles and a 5,700-foot elevation gain. Events throughout the weekend. Durango to Silverton, ironhorsebicycleclassic.com. Through May 26.
SATURDAY, MAY 25
Gunnison Growler Weekend. 32- and 64-mile mountain bike rides and events throughout the weekend. Downtown Gunnison, originalgrowler.com. Through May 26.
MONDAY, MAY 27
BolderBoulder 10K. For over four decades, BolderBoulder has celebrated the beloved running culture in Boulder County. Both runners and community members can participate in a full day of fun. Races finish at CU’s Folsom Field. First wave kicks off at 6:55 a.m. For information, go to bolderboulder.com.
Vail Valor Races. Watch or participate in the full marathon, marathon relay, half marathon, five-mile run/walk, or 1-mile memorial run to honor America’s fallen heroes and active service members. Vail, vailvalorraces.com.
FRIDAY, MAY 31
Burning Can Festival at Lyons Outdoor Games. Outdoor game competitions with beer and music to boot. Bohn Park, 199 Second Ave., Lyons, burningcancolorado.com. Through June 1.
SATURDAY, JUNE 1
Buena Vista Bike Fest. Road rides of various distances, 35 to 97 miles, only a two-hour drive from the Front Range. Enjoy a post-ride party in the park. 7 a.m. McPhelemy Park, Highway and Main Street, Buena Vista, bvbf.org.
Fire Hydrant 5K and Pet Expo. Walk or run to support homeless pets and the Larimer Humane Society with this dog-friendly event featuring dog contests and activities for kids. 8 a.m. The Promenade Shops at Centerra and Chapungu Sculpture Park, 5971 Sky Pond Drive, Loveland, 970-530-2945.
Longmont Triathlon Weekend. Kids-only and beginner triathlons on Saturday; the 39th annual triathlon on Sunday. Centennial Pool, 1201 Alpine St., Longmont, 303-651-8406. Through June 2.
Run the Rockies. This year features a new course. Racers must take a shuttle bus from Frisco to the start of the race at Copper Mountain — no racer parking available at start line. Frisco Town Hall, 1 W. Main St., Frisco, 970-668-9133.
American Heart Association Heart Walk. Join thousands to walk or run for heart disease and stroke awareness. There will also be yoga in the end zone. 8 a.m. Broncos Stadium, 1701 Bryant St., Denver, 866-430-9255.
SUNDAY, JUNE 2
Palisade Gran Fondo. Your choice between two Western Colorado rides — the 40-mile Palisade Piccolo Fondo and the Palisade Gran Fondo — to benefit the promotion of a healthy lifestyle. 7 a.m. Peach Bowl Park, 600 Logan Ave. Palisade, palisadegranfondo.com.
Steamboat Marathon & Half Marathon. Enjoy the sights of the Elk River and Rocky Mountains on your run through Steamboat. 7:30 a.m. Routt County Courthouse, 522 Lincoln Ave., Steamboat Springs, 970-879-0880, steamboatchamber.com.
REVEL Rockies Marathon and Half Marathon. Whether you do half or all the way, a downhill race through the canyons and forests of the foothills. As the description says, the course is both fast and beautiful. 6 a.m. Evergreen, runrevel.com/rdv.
SATURDAY, JUNE 8
Ironkids Boulder Fun Run. For kids who want to get in on the racing action and have some fun. Different distances depending on age and interest. 9 a.m. Boulder High School, 1604 Arapahoe Ave., Boulder, ironman.com.
Mount Evans Ascent Race. This race is touted as one of America’s highest road races, gaining nearly 4,000 vertical feet to the top of Mount Evans at 14,264 feet. 6:30 a.m. Echo Lake, Highway 103, Idaho Springs, 303-642-7917.
Death Ride Tour X. This course covers 245 miles and 16,500 feet of elevation in three days riding through the San Juan Mountains, all in the effort to defeat ALS. Benefits go to the ALS Therapy Development Institute. Grand Imperial Hotel, 1219 Greene St., Silverton, deathridetour.com. Through June 10.
Red Rocks Extreme Challenge. Ride in a 33-mile, 62-mile metric century, 100-mile century or the BEAST ride at 130 miles and 13,000 feet of climbing. Ride to defeat ALS. Morrison, redrockscentury.com.
SUNDAY, JUNE 9
Garden of the Gods 10-Mile and 10K Run. Follow a challenging course through some awe-inspiring rock formations. 7 a.m. Garden of the Gods, 1805 N. 30th St., Colorado Springs,
Ride the Rockies. A seven-day bike, 445-mile ride touring through Crested Butte, Gunnison, Carbondale, Snowmass and more. Tour the Rockies on two wheels. Crested Butte,
303-954-6700, ridetherockies.com. Through June 30.
Ironman Boulder. The classic endurance race in the triathlon mecca of Boulder. Come test your strength and conquer the Ironman. 6 a.m. Boulder Reservoir, 5565 N. 51st St., Boulder, ironman.com.
Death Ride Challenge XL. An excruciating one-day, 245-mile ride for those not scared to push themselves. Benefits go to finding a cure for ALS. Durango, deathridetour.com. Through June 10.
SATURDAY, JUNE 15
Denver PRIDE 5K. Walk or run this 5K and show your PRIDE. Proceeds go to benefit Colorado’s LGBTQ community. 8 a.m. Colorado State Capitol, 200 E. Colfax Ave. Denver, denverpride.org.
Bacon Burner 6K. When a 5K won’t do, go for 3.8 miles on a paved trail with views of snow-capped peaks and the Dillon Reservoir. 9:30 a.m. Frisco Marina, 267 Marina Road, Frisco, 970-668-9133.
SUNDAY, JUNE 16
Father’s Day 5K. Celebrate Father’s Day by proving you can keep up with your kids, or with dad, in this 1-mile, 5k, 10k, 10-mile or half-marathon run. 7 a.m. Central Park Denver, 8801 Martin Luther King Blvd., Denver, 970-221-6655.
Father’s Day Classic 10K, 5K, Fun Run. Bring the family to ring in Father’s Day with a run through Arvada with varying length options including “The Manly Mile.” APEX Center, 13150 W. 72nd Ave., Arvada, dads5k.com.
Estes Park Marathon. Offering full and half marathons, 10K, 5K and kids races. 5:30 a.m. Estes Park, 970-214-4128, epmarathon.org.
SUNDAY, JUNE 23
Golden Gran Fondo Festival. Grab your friends and watch or participate in one of the most challenging road races in the nation with three route options of 91, 63 and 20 miles. 8 a.m. Parfet Park, 10th Street and Washington Avenue, 765-247-2453.
THURSDAY, JUNE 27
Crested Butte Bike Week. A whole week of rides through scenic routes and historical areas during a bike weekend in the home of mountain biking. Events include skill clinics, movie nights and more. Crested Butte, cbbikeweek.com. Through June 30.
Colorado Firecracker 4K/4 Mile. Celebrate Independence Day early with a fun run, crawfish boil, beer and fireworks. 8 a.m. Erie Community Center, 450 Powers St., Erie, 303-926-2550, coloradofirecrackerrun.com.
THURSDAY, JULY 4
Mount Evans Freedom Run 5K. Toast the U.S. and support Mount Evans Home Health & Hospice with a morning run. 8 a.m. Evergreen Middle School, 2059 Hiwan Drive, Evergreen, 303-674-6400, freedomrunrace.org.
SATURDAY, JULY 6
LG Sprint Triathlon and LG Kids Triathlon. A fun sprint triathlon for kids and adults in honor of Laura Genelin, with benefits going to Vail Valley Charitable Fund. 7 a.m. Eagle Pool and Ice Rink, 1700 Bull Pasture Road, Eagle, 970-328-5277, lgtri.com.
FRIDAY, JULY 12
Roger’s River Run 5K. Wear your glow-in-the-dark running gear for this night-time run on the Greenway GLOW. Then stop by Rhythm on the River to boogie down at the after-party. 7:30 p.m. Boston Avenue, across from Boulder County Fairgrounds, Longmont, 303-776-6050.
Louisville Spaghetti Open Golf Tournament. Enjoy the day with a game of golf, then finish it up with a big bowl of spaghetti. 7:30 a.m. Coal Creek Golf Course, 585 W. Dillon Road, Louisville, 303-666-7888.
FRIDAY, JULY 13
Single, Double and Triple Bypass Bicycle Tour. Choose your own adventure with the single bypass starting in Copper, the double starting in Georgetown or the triple taking off from Evergreen. All races finish in Avon,
Aspen Valley Marathon. Scenic runs — marathon, half and 5K — along the Rio Grande Trail. The best part? Racers travel 1,418-feet downhill. Aspen Wagner Park, S. Mill Street, Aspen, aspenvalleymarathon.com.
Frisco Triathlon. A new take on the formal triathlon with a 3K stand-up paddleboard, 12-mile mountain bike ride and a 5K trail run. 8:30 a.m. Frisco Marina, 267 Marina Road, Frisco, 970-668-5276, townoffrisco.com.
SUNDAY, JULY 14
Boulder Peak Triathlon. Come partake in one of the country’s longest and most well-known triathlons. For both the new and professional racer. Boulder Reservoir, 5565 N. 51st St., Boulder, withoutlimits.com.
SATURDAY, JULY 20
Courage Classic. Join a community of more than 2,000 riders to support the Colorado Children’s Hospital with a two-day, scenic cycling event starting and ending at Copper Mountain. There’s also a 1K for kids. Copper Mountain Resort, 209 10 Mile Circle, Frisco, childrenscoloradofoundation.org/courage-classic. Through July 21.
FRIDAY, JULY 26
Black Diamond Open Golf Tournament. 18 holes of golf plus other competitions, a team contest, food and prizes. 7:30 a.m. Indian Peaks Golf Course, 2300 Indian Peaks Trail, Lafayette, 303-666-9555.
SATURDAY, JULY 27
Enduro World Series Mountain Bike Race. This year, Big Mountain Enduro stops in Telluride for raw and rugged mountain biking. Telluride, bigmountainenduro.com.
Bob Cook Mount Evans Memorial Hill Climb. A legendary bike race on the highest paved road in the U.S. from Idaho Springs to the summit of Mount Evans. 320 Chicago Creek Road, Idaho Springs, 303-249-6168, bicyclerace.com.
SUNDAY, JULY 28
Barr Trail Mountain Race. This historic race begins at an elevation of 6,570 feet and then gains more than 3,600 feet before finishing at the Barr Trailhead. 7 a.m. Pikes Peak Cog Railway, 515 Ruxton Ave., Manitou Springs, barrtrailmountainrace.com.
SATURDAY, AUG. 3
Ironman 70.3 Boulder. 1.2-mile swim, 56-mile bike, and 13.1-mile run will offer 30 qualifying slots to the 2019 world championship in New Zealand. Boulder Reservoir, 5565 N. 51st St., Boulder, ironman.com.
L.A.P.S. Canine 4K. For the 29th year, this 4K charity fun-run is for dogs, their owners and friends, hosted by the League for Animals & People of the Summit. 9:15 a.m. Frisco Historic Park Gazebo, 120 Main St., Frisco,
Littleton Twilight Criterium & Bike Fest. A timed bike race on a closed-circuit course that is just as fun for the participants as it is for the spectators, with music, beer and food to top it off. Historic Downtown, Alamo Ave., Main Street, Downtown Littleton, 303-795-3728, littletonrocks.com.
SATURDAY, AUG. 10
Aspen Backcountry Marathon. This tough but beautiful race offers full or half marathons run on mountain dirt trails and offers spectacular views of the Elk Mountains. Rio Grande Park near downtown Aspen, 970-429-2093, aspenbackcountrymarathon.com.
Georgetown to Idaho Springs Half-Marathon. Take a picturesque run along Clear Creek in a race that’s described as one of the pleasurable in the Western U.S. Race starts next to Georgetown Lake in Georgetown, gtishalf.com.
Longmont Sunrise Stampede. Founded in 1986, a family-oriented two-mile run/walk and 10K run on a certified course raising money for the Education Foundation for the St. Vrain Valley School District. 8 a.m. Silver Creek High School, 4901 Nelson Rd., Longmont,
TUESDAY, AUG. 13
Transrockies Run. A stage race that takes you or a team on an epic 120-mile journey from Buena Vista to Beaver Creek over six days and various terrains from the wild to the serene. Buena Vista Heritage Museum, 506 E. Main St., Buena Vista, 866-373-3376, transrockies-run.com. Through Aug. 18.
SATURDAY, AUG. 17
AUDI Power of Four Trail Run and Mountain Bike Races. Ride through the terrain of the four Aspen Snowmass mountains, and test your endurance, whether you’re a novice or elite athlete. Aspen Mountain Upper Gondola Plaza., Aspen, 970-925-1220, aspensnowmass.com.
SUNDAY, AUGUST 18
Evergreen Kids Triathlon. Fun, non-competitive races of different lengths for 5- to 10-year-olds to inspire kids to be active. 9 a.m. Buchanan Park Recreation Center, 32003 Ellingwood Trail, Evergreen, 720-880-1219.
SATURDAY, AUGUST 24
Pikes Peak Ascent and Marathon. Two tough races only open to qualified runners on one of Colorado’s favorite peaks. 7 a.m. Memorial Park, 502 Manitou Ave., Manitou Springs, 719-473-2625, pikespeakmarathon.org. Through Aug. 25.