| Month |
Race Name |
Events |
Location |
Near |
|
| January |
Beaver Creek Snowshoe Series Race #1 |
10 km, 5 km |
CO, United States |
Beaver Creek |
|
| February |
Beaver Creek Snowshoe Series Race #2 |
10 km, 5 km |
CO, United States |
Beaver Creek |
|
| February |
Powder and Porters Winter Trail Run |
4.5 mi |
CO, United States |
Evergreen |
|
| February |
Old Man Winter Rally |
10 km |
CO, United States |
Lyons |
|
| February |
Old Man Winter Bike Rally and Run |
10 km, 5 km |
CO, United States |
Lyons |
|
| March |
Beaver Creek Snowshoe Series Race #3 |
10 km, 5 km |
CO, United States |
Beaver Creek |
|
| April |
Desert R.A.T.S. Marathon/50K |
50 km, 26.2 mi |
CO, United States |
Fruita |
|
| April |
Desert R.A.T.S. 10K/13.1 Mile |
13.1 mi, 10 km |
CO, United States |
Fruita |
|
| April |
Desert RATS Trail Running Festival |
13.1 mi |
CO, United States |
Fruita |
|
| April |
Desert RATS Trail Running Festival |
50 km, 26.2 mi, 13.2 mi, 10 km |
CO, United States |
Fruita |
|
| April |
Rattler Trail Race |
50 km, 25 km, 10 km |
CO, United States |
Colorado Springs |
|
| April |
Colorado Trailfest |
4.3 mi |
CO, United States |
Rifle |
|
| April |
Royal Gorge Groove Trail Runs |
50 km, 30 km, 20 km, 12.5 km, 5 km |
CO, United States |
Colorado Springs |
|
| May |
Sky Mesa Pass Trail Marathon |
26.2 mi |
CO, United States |
Grand Junction |
|
| May |
The Sage Burner |
50 km, 25 km |
CO, United States |
Gunnison |
|
| May |
Greenland Trail 50K, 25K, 8M |
50 km, 25 km, 8 mi |
CO, United States |
Larkspur |
|
| May |
The Beer Relay |
6 mi |
CO, United States |
Lyon's |
|
| May |
SAGE Spring Run-Off Trail Race |
10 mi, 5 mi |
CO, United States |
Wolcott |
|
| May |
Boulder Mountain Marathon and 10-mile Ascent |
26.2 mi, 10 mi |
CO, United States |
Gold Hill |
|
| May |
Fear the Deer trail 1/2 marathon |
13.1 mi |
CO, United States |
Littleton |
|
| May |
Cheyenne Mountain Ultra 10x5k |
50 km, 5 km |
CO, United States |
Colorado Springs |
|
| May |
Collegiate Peaks Trail Run |
50 mi, 25 mi |
CO, United States |
Buena Vista |
|
| May |
Fruita Trail Half |
13.8 mi |
CO, United States |
Fruita |
|
| May |
Quad Rock 50/25mi |
50 mi, 25 mi |
CO, United States |
Fort Collins |
|
| May |
Adventurefest |
13.8 mi |
CO, United States |
Fruita |
|
| May |
Valkyrie Trail Race |
50 km, 26.2 mi, 30 km, 13.1 mi, 8 mi, 4 mi |
CO, United States |
Colorado Springs |
|
| May |
Dynafit Boneyard Boogie 13k & 5k |
13 km, 5 km |
CO, United States |
Eagle |
|
| June |
NIKE Summit Trail Running Series #5 - Bakers Tank |
9 km, 4 km |
CO, United States |
Breckenridge |
|
| June |
San Juan Solstice 50 |
50 mi |
CO, United States |
Lake City |
|
| June |
Turquoise Lake Half Marathon |
13.1 mi |
CO, United States |
Leadville |
|
| June |
Hardscrabble Mountain Trail Run |
45 km, 10 km, 5 km |
CO, United States |
Colorado Springs |
|
| June |
Hardscrabble Mountain Trail Run - Runner Reports |
45 km, 10 km, 5 km |
CO, United States |
Colorado Springs |
|
| June |
Leadville Trail 100 Training Camp |
58 mi |
CO, United States |
Leadville |
|
| June |
Turkey Track Trail Marathon (& half) |
26.2 mi |
CO, United States |
Pagosa Springs |
|
| June |
Run For Aurora 50K and 50 Mile |
50 mi |
CO, United States |
Denver |
|
| June |
North Fork 50 |
50 mi, 50 km |
CO, United States |
Pine |
|
| June |
Leadville Trail Heavy Half Marathon |
15 mi |
CO, United States |
Leadville |
|
| June |
Ragnar Trail Snowmass, Presented by Salomon |
120 mi |
CO, United States |
Aspen |
|
| June |
Part to Art Race |
13.1 mi, 6.2 mi, 3.1 mi |
CO, United States |
Meeker |
|
| June |
Golden Gate Dirty 30 |
50 km |
CO, United States |
Gilpin County |
|
| June |
Summit Trail Running Series Race #1 |
7 km, 4 km |
CO, United States |
Breckenridge |
|
| June |
Summit Trail Running Series #2 |
5 km |
CO, United States |
Breckenridge |
|
| June |
Dynafit Summer Solstice Trail Run |
10 km, 5 km |
CO, United States |
Beaver Creek |
|
| June |
Crazy Legs 10k Trail Run |
10 km |
CO, United States |
Loveland |
|
| July |
Hardrock 100 Endurance Run |
100 mi |
CO, United States |
Silverton |
|
| July |
Leadville Trail Marathon |
26.2 mi |
CO, United States |
Leadville |
|
| July |
Leadville Silver Rush 50 Trail Run |
50 mi |
CO, United States |
Leadville |
|
| July |
Tecnica "Catch Me if You Can" Challenge |
8 mi |
CO, United States |
Breckenridge |
|
| July |
Grin and Bear It Trail Run |
15 km |
CO, United States |
Crested Butte |
|
| July |
Living Journeys Half Marathon |
13.1 mi |
CO, United States |
Crested Butte |
|
| July |
Under Armour Mountain Running Series - Copper |
50 km, 25 km, 10 km, 5 km |
CO, United States |
Frisco |
|
| July |
Never Summer 100k/60k |
103 km, 61 km |
CO, United States |
Gould |
|
| July |
Summit Trail Running Series Race #3 |
7 km, 5 km |
CO, United States |
Breckenridge |
|
| July |
Summit Trail Running Series Race #4 |
14 km, 6 km |
CO, United States |
Breckenridge |
|
| July |
Breckenridge Independence Day 10K Trail Run |
10 km |
CO, United States |
Breckenridge |
|
| July |
Pikes Peak Ultra |
50 mi, 50 km, 30 km, 20 km |
CO, United States |
Colorado Springs |
|
| July |
Dynafit Vail HillClimb |
7.7 mi |
CO, United States |
Vail |
|
| July |
Dynafit 5k &10k at 10,000 Feet |
10 km, 5 km |
CO, United States |
Vail |
|
| July |
Fox on the Run Trail Races |
10 mi, 5 mi |
CO, United States |
Pagosa Springs |
|
| August |
Leadville Trail 100 |
100 mi |
CO, United States |
Leadville |
|
| August |
Pikes Peak Ascent |
13.3 mi |
CO, United States |
Manitou Springs |
|
| August |
10,000 Meters at 10,000 Feet Run |
10 km |
CO, United States |
Steamboat Springs |
|
| August |
Leadville Trail10k Run |
10 km |
CO, United States |
Leadville |
|
| August |
Mountain Chile Cha Cha |
15 mi, 7 mi, 5 km |
CO, United States |
Pagosa Springs |
|
| August |
Aspen Backcountry Marathon |
26.2 mi |
CO, United States |
Aspen |
|
| August |
The Mountain Ultra |
220 km |
CO, United States |
Crested Butte |
|
| August |
Summit Trail Running Series Race #6 |
11 km, 7 km |
CO, United States |
Breckenridge |
|
| August |
Breckenridge Hunky Dory Half Marathon |
13.1 mi |
CO, United States |
Breckenridge |
|
| August |
XTERRA Trail Run Castle Rock |
20 km |
CO, United States |
Castle Rock |
|
| August |
Moonshadow Half Marathon and 10k |
13.1 mi, 10 km |
CO, United States |
Colorado Springs |
|
| August |
Honey Stinger Emerald Mountain Epic |
26.2 mi |
CO, United States |
Steamboat Springs |
|
| August |
Silverton Ultra Dirty |
100 mi, 100 km, 60 km |
CO, United States |
Silverton |
|
| August |
Lory Summer Trail Series |
12 km, 10 km, 5 km, 5 km |
CO, United States |
Fort Collins |
|
| August |
Staunton Rocks! Marathon & Half |
26.2 mi, 13.1 mi |
CO, United States |
Pine |
|
| August |
Summit Trail Running Series Race #5 |
11 km, 7 km |
CO, United States |
Breckenridge |
|
| August |
Summit Trail Running Series Race #6 |
14 km, 8 km |
CO, United States |
Breckenridge |
|
| August |
Kokopelli Classic |
13.1 mi, 8 mi, 5 km, 0 mi |
CO, United States |
Fruita |
|
| August |
Wildcat Mountain Trail Races - 10K/10M |
10 mi, 10 km |
CO, United States |
Littleton |
|
| August |
New Castle Dirty Dozen Trail 10K |
10 km |
CO, United States |
New Castle |
|
| August |
Dynafit Berry Picker Trail Run |
4.6 mi |
CO, United States |
Vail |
|
| August |
Dynafit Arrowhead Half Marathon & 5k |
13.1 mi, 5 km |
CO, United States |
Edwards |
|
| August |
Turkey Springs Showdown Trail Races |
13.1 mi, 10 km |
CO, United States |
Pagosa Springs |
|
| September |
Creede Mountain Runs |
22 mi, 12 mi, 2 mi |
CO, United States |
Creede |
|
| September |
American Discovery Trail Marathon, Half Marathon & 5K |
26.2 mi, 13.1 mi, 5 km |
CO, United States |
Colorado Springs |
|
| September |
Sombrero Ranch Roundup |
4.5 mi |
CO, United States |
Estes Park |
|
| September |
Golden Leaf Half Marathon |
13.1 mi |
CO, United States |
Aspen |
|
| September |
Boulder Backroads Marathon & Half Marathon |
26.2 mi, 13.1 mi |
CO, United States |
Boulder |
|
| September |
Frisco Fall Trail Running Festival |
12 mi, 6 mi |
CO, United States |
Frisco |
|
| September |
Frisco Fall Trail Running Festival - Runner Reports |
12 mi, 6 mi |
CO, United States |
Frisco |
|
| September |
Imogene Pass Trail Run - Runner Reports |
17.1 mi |
CO, United States |
Ouray |
|
| September |
Lead King Loop |
25 km, 12.5 km |
CO, United States |
Marble |
|
| September |
Breck Crest |
23 mi, 13.3 mi, 10 km |
CO, United States |
Breckenridge |
|
| September |
Vail Victory Trail Marathon |
26.2 mi |
CO, United States |
Vail |
|
| September |
Grand Traverse Mountain Run |
40 mi |
CO, United States |
Crested Butte |
|
| September |
Run Rabbit Run |
100 mi, 50 mi |
CO, United States |
Steamboat Springs |
|
| September |
Breckenridge Falling Leaves 7K Trail Run |
7 km |
CO, United States |
Breckenridge |
|
| September |
Rocky Mountain trail and ultra running camp |
20 mi |
CO, United States |
Idaho Springs |
|
| September |
The Dam Run at Castlewood Canyon |
10 km |
CO, United States |
Castle Rock |
|
| September |
Beulah Challenge Trail Half Marathon |
13.1 mi, 10 km, 5 km |
CO, United States |
Beulah |
|
| September |
Imogene Pass Trail Run |
17.1 mi |
CO, United States |
Ouray |
|
| September |
Black Squirrel Half Marathon |
13.3 mi |
CO, United States |
Fort Collins |
|
| September |
Mountain RATS |
50 km, 26 mi, 14.4 mi |
CO, United States |
Eagle |
|
| September |
Crested Butte Ultra |
50 mi, 55 km, 33 km |
CO, United States |
Crested Butte |
|
| September |
24 Hours of Palmer Lake |
82 km |
CO, United States |
Palmer Lake |
|
| September |
West Line Winder |
50 km, 30 km |
CO, United States |
Buena Vista |
|
| September |
Sawatch Ascent |
50 km |
CO, United States |
Buena Vista |
|
| September |
Dynafit Meadowgold 5k & 10k |
10 km, 5 km |
CO, United States |
Minturn |
|
| September |
Alberta Peak Challenge |
12 mi, 4 mi |
CO, United States |
Pagosa Springs |
|
| October |
Devil Mountain |
50 mi, 50 km, 13.1 mi |
CO, United States |
Pagosa Springs |
|
| October |
XTERRA Marathon Of Trail Races |
26.2 mi, 13.1 mi, 5 mi |
CO, United States |
Colorado Springs |
|
| October |
Rocky Mountain Brew runs: trails, views and brews |
4.5 mi |
CO, United States |
Golden |
|
| October |
John Wayne Grit Series True Grit Anniversary 10K |
10 km |
CO, United States |
Montrose |
|
| October |
Blue Sky Trail Marathon |
26.7 mi |
CO, United States |
Fort Collins |
|
| October |
The bRUNch Trail Run |
15 km, 5 km |
CO, United States |
Beaver Creek |
|
| October |
Bobcat Trail Race |
50 km, 25 km, 10 km, 5 km |
CO, United States |
Colorado Springs |
|
| October |
Cart to Cart Trail Race |
19 mi, 10 mi |
CO, United States |
Crested Butte |
|
| November |
Trail Apples 4, 8, or 12 miles |
12 mi |
CO, United States |
Littleton |
|
| November |
Backcountry Wilderness Half Marathon |
13.1 mi |
CO, United States |
Littleton |
|
| November |
Kessel Run Ultra |
50 mi, 60 km, 20 mi, 10 mi |
CO, United States |
Fruita |
|
