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Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all.  To have an event posted here please follow this link:  Event Policy Submission & Guidelines

2nd Annual Fatty Patty 50k

Leadville   These unique and exciting races occur throughout the winter in and around Leadville. Utilizing groomed nordic ski trails, groomed singletrack, and snowmobile trails, these races are a great way to keep riding and racing during the off-season. ThreeRead More

Pedaling for St. Pats

Colorado Springs   Join hundreds of cyclists for your choice of ride across the city. Three courses to chose from ranging from a family friendly course to a grueling but amazing ride from Downtown to the top of Woodmen atRead More

Staunton Snoduro

Staunton State Park 12102 South Elk Creek Road, Pine

Staunton State Park, Pine   Registration is open for the Staunton Snoduro, the Enduro-style Fat Bike Race on Sunday, March 17 at Staunton State Park! The course: Six stages. 18-19 miles total. STAGE #1 START: Near the overlook (highpoint) onRead More

Bicycle Revolution Advocacy Event

Community Cycles 2805 Wilderness Place Suite 1000, Boulder

A fun positive advocacy movie (thebicyclerevolution.org) with new LA music will be looping while representatives from the Community Cycles advocacy committee, City and County staff, and the City's Transportation Advisory Board can answer your questions and receive your input. TransportationRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

SETCR Spring Road Camp

Source Endurance Training Center of the Rockies 1833 E Harmony Rd #20, Ft. Collins

Ft. Collins   Source Endurance Training Center of the Rockies’ Spring Road Camp is back for Year 3 with bigger and better support. The camp will run Thursday March 21st through Sunday March 24th. The camp is hosted by proRead More

4SOH

lory state park 708 N Co Rd 25G, Bellvue

Fort Collins   The Four Seasons of Horsetooth Mountain Bike Challenge is a grass-roots un-event with no entry fees and no real start times and is ridden on the two solstices and two equinoxes in Horsetooth Mountain Park and Lory State Park. ByRead More

Louisville Criterium

Louisville   Check out the great photos by Brent Murphy HERE Kick off the spring season this March at one of the fastest races in Colorado, featuring new asphalt placed in spring of 2018. Louisville offers fast flowing corners, aRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

Seattle to Singapore by Cycle & Sea – Travel Presentation & Book Signing

Boulder Book Store 1107 Pearl St, Boulder

Boulder   Their love spans centuries. Will it survive a journey around the world? After getting blacklisted from the venture capital industry, twenty-nine-year-old Edward Vaughan will do anything to avoid telling his wife what happened. Even if it means agreeingRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

3rd Annual Wonder Women Elite Athlete Panel

Rapha Boulder 1815 Pearl St, Boulder

Boulder   The Wonder Women Elite Athlete Panel to benefit World Bicycle Relief will feature panelists Katie Compton (pro cyclist), Sarah Thomas (marathon swimmer), Junko Kozukawa (ultra runner), Rachel Joyce (pro triathlete).  The panel will be moderated by pro triathleteRead More

Firepower Cycling Camp

The Nature Place 2000 Old Stage Rd, Floirssant

Florissant   RyseOn and The Crippler are partnering to bring you the coolest event in cycling camp history. For one weekend, experience world-class coaching, all-inclusive amenities, and endless gravel roads. Base camp will be at The Nature Place near Florissant,Read More

Boulder Roubaix Road Race

Boulder   First held in 1990, Boulder Roubaix Road Race is the most popular and largest attended one day road race in Colorado. 32 different categories to choose from. From 1st timer to Pros. An 18.7 miles (30k) loop withRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

Austin Rattler MTB

Reveille Peak Ranch TX

Reveille Peak Ranch, Texas   Saddle up for a Texas mountain biking favorite at the Austin Rattler MTB, produced by Youphoria Productions. Our 33k loop course offers plenty of fun in one lap alone, but those that ride 100k willRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

East Side Epic

Cycles of Life Bicycles 309 Harrison Ave, Leadville

Leadville   These unique and exciting races occur throughout the winter in and around Leadville. Utilizing groomed nordic ski trails, groomed singletrack, and snowmobile trails, these races are a great way to keep riding and racing during the off-season. ThreeRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

Koppenberg Road Race

The infamous Koppenberg Race, featuring the climb (17% grade), is the queen of the spring time cycling events in Colorado. This rustic setting sits next to, and incorporates parts of the Morgul Bismark Course. Boulder's Spring Classic is set toRead More

Karen Hornbostel Memorial Time Trial Series

Cherry Creek State Park 4201 S. Parker Road, Aurora

Aurora   The 2019 Series consists of seven (7) individual time trials on consecutive Wednesday evenings.   Event details and registration here

Bikerpelli Kokopelli Trail

Fruita   WHAT IS BIKERPELLI? The largest, most peic multi-day MTB event on the Kokopelli Trail. We host two fully supported trips in May for 3 days and nights and an average of 150 miles of serious trail time. You'llRead More

24th Annual Fruita Fat Tire Festival

Fruita

Fruita   Join us on May 3-5, 2019 as we celebrate our 24th year of this Colorado Mountain Bike tradition; the US Bank Fruita Fat Tire Festival presented by the City of Fruita. Meet MTB friends from around the worldRead More

50k & 100k Encierro Velo

Monument

Monument   Ready to test your courage? Or just looking for a adrenaline rush at the start of a awesome season ? Then Encierro Velo is your spring event. It will wake you up from your winter slumber! Google EncierroRead More

Ridgeline Rampage

Phillip South Miller Park 1375 W Plum Creek Parkway, Castle Rock

Castle Rock   Come out for the 10th annual spring fling on the grassy lawn at the Phillip S. Miller Amphitheater. Brink your blanket, spread out on the lawn and cheer on the racers. This ~12 mile circuit includes aRead More

May the Fourth Be With You Kids’ Bike Rodeo

Longmont   Kick off the season right with a skills course and first dibs on the new bike map.  A fun family-friendly bike event to get the season going.  We may be looking for best Star Wars themed costumes too.Read More

Fountain Roubaix

City Hall 116 S Main St, Fountain

Fountain   Starting & finishing in downtown Fountain, CO, the Fountain-Roubaix is the first event on our inaugural Tour of Colorado Series.  Evoking it's namesake, the infamous Paris-Roubaix, the course has more than 40 miles of El Paso County, ColoradoRead More

Cinco de Grindo

Kettle & Spoke Brewery 2500 47th St #12, Boulder

Boulder   100km-Climbing-Dirt-Gravel-Singletrack-Checkpoints-Lucha Libre ¡Dios Mio! Cinco de Grindo returns for a day on the backcountry roads and trails of Boulder County. Mas Informaciòn: giddyupboulder.blogspot.com

Bike to School Day

The first-ever National Bike to School Day took place on May 9, 2012, in coordination with the League of American Bicyclists' National Bike Month. Almost 1,000 local events in 49 states and the District of Columbia joined to gather toRead More

Bikerpelli Kokopelli Trail

Fruita   WHAT IS BIKERPELLI? The largest, most peic multi-day MTB event on the Kokopelli Trail. We host two fully supported trips in May for 3 days and nights and an average of 150 miles of serious trail time. You'llRead More

Desert RATS MTB Classic

Fruita On the western slope of Colorado, the famous Kokopelli Trail winds its way through sagebrush, ledgy slickrock, winding double track, sandy washes, fast jeep trails and crosses the state line toward Moab, Utah. This trail is the site ofRead More

Colorado Junior Cup

BOERA 599 Rosalie Road, Bailey

Platte Canyon School District   Colorado Junior Cup (CJC) was created to provide more racing opportunities to our juniors. It is our focus to create an environment that is competitive, but more importantly fun and exciting. Ultimately the goal isRead More

USA Cycling Marathon Mountain Bike National Championships

Palo Duro Canyon, TX Palo Duro Canyon

Palo Duro Canyon, TX   Online registraion for the 2019 Cycling Marathon Mountain Bike National Championship will open on March 14th. More information will be posted as it is finalized.   Event details and registration here

12 Hours of Mesa Verde

Cortez   12 Hours of Mesa Verde is a premier cycling event organized by volunteers dedicated to improving the lives of youth in Southwest Colorado. The 12 Hours of Mesa Verde began as "Ride the Lightning" in 2003, but hasRead More

Triple C Bike Ride

Broomfield   The Triple C Bike Ride is an early season ride on the front range of Colorado, starting in Broomfield, going north to Johnstown and back to Broomfield for an end-of-ride celebration. All proceeds from the ride benefit theRead More

Bike Night

Roosevelt Park 700 Longs Peak Ave, Longmont

Longmont   The original family-friendly cruiser night is back for another year, beginning mid May.  Meet others from all over on this slow ride through Old Town Longmont.  All abilities welcome. Every Wednesday evening, 6:30PM Roosevelt Park at the flagpoles.Read More

The Grand Junction Off-Road

Grand Junction Grand Junction

Grand Junction   All participants will climb their way out of downtown Grand Junction onto the Uncompahgre Plateau, while connecting some of the area's favorite technically challenging single track, double track, gravel toads and the occasional paved segment in theRead More

Pony Xpress Gravel 160

Trinidad CO

Trinidad 160K/70K gravel grinder   Come discover the challenge’s Pony Express riders faced in the 1860’s. These earliest American racers speed across remote, desolate regions of America. They had to combine speed, endurance, and mental toughness just to stay alive.Read More

Superior Morgul

Superior   Two of the most iconic courses on back to back days, right in the heart of Boulder County! On Saturday the action kicks off with the eight mile time trial event down Marshall Rd & Cherryvale, with theRead More

25th Annual Ride for the Pass

Aspen CO

Aspen   The Ride for the Pass is a fundraiser for the Independence Pass Foundation, whose mission is to restore and protect the ecological, historical, and aesthetic integrity of Independence Pass, a magnificent alpine landscape east of Aspen. The RideRead More

Battle the Bear

Bear Creek Lake Park Morrison

Lakewood   Race #2 in The Series. Distances for all abilities and ages, including a new 3-person Relay team discipline.  The intimate venue and Pit Zone offers a fantastic setting for hot racing action and spectating.  There will be a sponsorRead More