Colorado Run Listings
Monday 28 May 2018
Bolder Boulder
America's All Time Best 10K
Saturday 2 Jun 2018
Palmer Lake Half Marathon and 10K
Can you say, "Wide Open Spaces.."
Saturday 2 Jun 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 2 Jun 2018
Run the Rockies Road Race
10K and Half Marathon along the Ten Mile Range on the paved recreation path
Saturday 2 Jun 2018
Walk for Life
A simple way for people of all ages to get involved by actively demonstrating support for the Sanctity of Human Life
Saturday 2 Jun 2018
Elk Meadow 5k Trail Race
This 5K race leads runners throughout the rolling hills of Elk Meadow Open Space Park
Saturday 2 Jun 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 2 Jun 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 2 Jun 2018
Turquoise Lake 20K
Offers unparalleled mountain views as you run clockwise around scenic Turquoise Lake
Saturday 2 Jun 2018
Denver Brain Tumor Walk
An opportunity for individuals and teams to honor and remember loved ones, connect with others interested in the brain tumor community and raise awareness
Sunday 3 Jun 2018
Skirt Sports 13er
13er, 10k, 5k
Sunday 3 Jun 2018
Crazy Legs 10K Trail Run
The course has rocks, dirt, hills, other trail users and wildlife. The race will go on no matter if it raining, sleeting, snowing, hot or cold
Sunday 3 Jun 2018
Boulder Rez Half Marathon
This amazing run course around the Boulder Reservoir is astonishing and remains mostly on dirt roads and trails
Sunday 3 Jun 2018
Steamboat Marathon
Find out why the Steamboat Marathon was ranked as one of the "Top 10 Destination Marathons in North America"
Sunday 3 Jun 2018
Fish Hatchery 5K
Features a scenic cross country style course that winds through subalpine forest
Saturday 9 Jun 2018
Mueller Marathon
Marathon and 25K at Mueller State Park
Saturday 9 Jun 2018
Steamworks Half Marathon
One of Durango's favorite races
Saturday 9 Jun 2018
South Park Trail Marathon and Half
The South Park Marathon and Half are among the highest in Colorado
Saturday 9 Jun 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 9 Jun 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 9 Jun 2018
Big Dog Brag
Colorado's Family-Friendly 5K & 2K Fun Mud Obstacle Run
Saturday 9 Jun 2018
Colorado Springs Heart Walk
Building healthier lives, free of cardiovascular diseases and stroke
Saturday 9 Jun 2018
Rebel Rose 5K
Come out and bring the whole family to have fun and support women in the Construction Trades
Saturday 9 Jun 2018
Denver Heart and Stroke Walk
5K or 1 Mile Option
Sunday 10 Jun 2018
Garden of the Gods 10 miler
Big Hills, Awesome Rocks, All Challenge
Thursday 14 Jun 2018
Six Pack Series - Summer-Fall #1
#RaceMyPace
Saturday 16 Jun 2018
Summer Breeze 1M, 5K, 10K & Half Marathon
Superior events from start to finish
Saturday 16 Jun 2018
Trail Marathon & Heavy Half
Run through the historic mining district's challenging old mining roads and trails, and hit a high of 13,185 feet
Saturday 16 Jun 2018
Chick-fil-A Family 5K
5K (3.1-mile) run/walk and kids' fun run
Saturday 16 Jun 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 16 Jun 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 16 Jun 2018
Sierra's Race Against Meningitis
Help us raise awareness and save lives
Saturday 16 Jun 2018
Eagle Half Marathon and 10K
If you love to take pictures why you run/race then get your camera out, because you won't want to miss these mountain views
Sunday 17 Jun 2018
Father's Day Classic
Come to race and stay for the FREE Father's Day Car Show
Sunday 17 Jun 2018
Fathers Day 5K/10K
Celebrate your Father, Brother, Son, Uncle, Grandfather, Husband or Friend with a great run or walk
Saturday 23 Jun 2018
Castle Rock Half Marathon
Half marathon, 5-mile, rock challenge
Saturday 23 Jun 2018
Mountain Ridge Trail Half Marathon and 10K
Formerly known as the "East-West" trail race
Saturday 23 Jun 2018
Slacker Half Marathon
The highest downhill half marathon in the country and possibly the highest dowhill 4 Mile Run
Saturday 23 Jun 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 23 Jun 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 23 Jun 2018
Rocky Mountain Brew Run at Boulder Beer Co
Run for the beer, stay for the PARTY
Tuesday 26 Jun 2018
Frisco Mountain Goat Kids Trail Running Series #1
Series of four kids trail running races over the summer
Thursday 28 Jun 2018
Six Pack Series - Summer-Fall #2
#RaceMyPace
Saturday 30 Jun 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 30 Jun 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 30 Jun 2018
Freedom Four Miler
Kick off your Independence Day weekend with a BANG
Sunday 1 Jul 2018
Mountain Madness Half Marathon
One of the three oldest races in Steamboat Springs
Wednesday 4 Jul 2018
Longmont Half and 5k
Part of the hometown race series.
Wednesday 4 Jul 2018
Palmer Lake 4-Mile Fun Run
Supports Palmer Lake Elementary School
Wednesday 4 Jul 2018
Independence Day 10K Trail Run
Some of the best views in the Breckenridge area
Wednesday 4 Jul 2018
FireKracker 5k
Scenic, flat and fast course in City Park
Wednesday 4 Jul 2018
Firecrackers & Flapjacks 4 Mile Run
Join us for a 4 Mile Run before enjoying pancakes in the park
Wednesday 4 Jul 2018
Let Freedom Run
5K, 10K, Kids Run
Friday 6 Jul 2018
Silverton 1000 Day 1
Multiday Run consisting of six separate running events
Saturday 7 Jul 2018
Silverheels 100
The Grand-Daddy of all the Human Potential Running Series Races
Saturday 7 Jul 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 7 Jul 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 7 Jul 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 7 Jul 2018
Silverton 1000 Day 2
Multiday Run consisting of six separate running events
Sunday 8 Jul 2018
Silver Rush 50
Take on 50 miles of extreme territory that starts at 10,200 feet and reaches 12,000 feet
Sunday 8 Jul 2018
USATri60
Indoor triathlon
Sunday 8 Jul 2018
Silverton 1000 Day 3
Multiday Run consisting of six separate running events
Monday 9 Jul 2018
Silverton 1000 Day 4
Multiday Run consisting of six separate running events
Tuesday 10 Jul 2018
Silverton 1000 Day 5
Multiday Run consisting of six separate running events
Tuesday 10 Jul 2018
Frisco Mountain Goat Kids Trail Running Series #2
Series of four kids trail running races over the summer
Wednesday 11 Jul 2018
Silverton 1000 Day 6
Multiday Run consisting of six separate running events
Thursday 12 Jul 2018
Six Pack Series - Summer-Fall #3
#RaceMyPace
Saturday 14 Jul 2018
Aspen Valley Marathon
A beautiful and scenice run along the Rio Grande Trail.
Saturday 14 Jul 2018
Sand Creek Half Marathon
Also 5K and 10K
Saturday 14 Jul 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 14 Jul 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 14 Jul 2018
Frisco Triathlon
Featuring stand-up-paddle boarding, mountain biking and trail running
Sunday 15 Jul 2018
USATri60
Indoor triathlon
Friday 20 Jul 2018
Hardrock 100
An ultramarathon of 100.5 miles in length, plus 33,050 feet of climb and 33,050 feet of descent
Saturday 21 Jul 2018
Prairie Dog Half, 5K, and 10K
5K 10K Half Marathon
Saturday 21 Jul 2018
Dog Days 1M, 5K, 10K & Half Marathon
Superior events from start to finish
Saturday 21 Jul 2018
Kickers For Kids Fun Run
5K / 10K / 13.1 / 26.2 / 50K / 50 Miler
Saturday 21 Jul 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 21 Jul 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 21 Jul 2018
La Sportiva Camp Hale Half Marathon
Half marathon, 10K and 5K
Sunday 22 Jul 2018
Black Hawk Trail Half Marathon
If you are looking for one of the best "hill" courses the ERS has to offer, then look no further
Tuesday 24 Jul 2018
Frisco Mountain Goat Kids Trail Running Series #3
Series of four kids trail running races over the summer
Thursday 26 Jul 2018
Six Pack Series - Summer-Fall #4
#RaceMyPace
Saturday 28 Jul 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 28 Jul 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 28 Jul 2018
Color in Motion 5K
Your body moving while being plastered in an explosion of vibrant color with all your friends and family!
Friday 3 Aug 2018
Wild West Relay
Fort Collins to Steamboat Springs
Saturday 4 Aug 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 4 Aug 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 4 Aug 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 4 Aug 2018
Hears 5K Experience
Tuesday 7 Aug 2018
Frisco Mountain Goat Kids Trail Running Series #4
Series of four kids trail running races over the summer
Thursday 9 Aug 2018
Six Pack Series - Summer-Fall #5
#RaceMyPace
Saturday 11 Aug 2018
Rocky Mountain Half
#RMHalf
Saturday 11 Aug 2018
Aspen Backcountry Marathon
Boasting spectacular views of the Elk Mountains and the city of Aspen
Saturday 11 Aug 2018
Mt. Sneffels Marathon
Run point to point downhill on a dirt road along the Uncompahgre River
Saturday 11 Aug 2018
Holy Cow Trail Stampede 5k/10k
Trail Stampede!
Saturday 11 Aug 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 11 Aug 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 11 Aug 2018
Odyssey Beerwerks Beer Run
Are you ready to get your brew on?!?
Saturday 18 Aug 2018
Pikes Peak Ascent
Saturday 18 Aug 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 18 Aug 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 19 Aug 2018
Pikes Peak Marathon
America's ultimate challenge
Sunday 19 Aug 2018
Dog Days of Summer
5K/10K & 1 Mile Doggy Dash
Thursday 23 Aug 2018
Six Pack Series - Summer-Fall #6
#RaceMyPace
Saturday 25 Aug 2018
Runapalooza 1M, 5K, 10K & Half Marathon
Superior events from start to finish
Saturday 25 Aug 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 25 Aug 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 26 Aug 2018
Erie Half Marathon and 5K
Bring 5 non-perishable items on race day and get entered into the race-day raffle.
Saturday 1 Sep 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 1 Sep 2018
Start It Off 5k Color Run
A fun 5k color run to start off the festivities for the Labor Day weekend
Saturday 1 Sep 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 1 Sep 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 2 Sep 2018
Cheap 5K
Celebrate cheap Americana - and eat pancakes!
Sunday 2 Sep 2018
Flea Market Mile
Monday 3 Sep 2018
ADT Marathon
10K, Half, Full
Friday 7 Sep 2018
Flaming Foliage Relay
Idaho Springs to Buena Vista
Saturday 8 Sep 2018
Arvada Harvest Half Marathon
Half Marathon, 5K/10K/10M
Saturday 8 Sep 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 8 Sep 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 8 Sep 2018
The Denver 5k
Fun, flat and fast around beautiful Sloan's Lake!
Sunday 9 Sep 2018
Step4Life
Raises money to help support patients and their families that have been affected by lung cancer
Saturday 15 Sep 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 15 Sep 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 22 Sep 2018
Fallfest 1M, 5K, 10K,Half Marathon, & Marathon
Superior events from start to finish line
Saturday 22 Sep 2018
The Pioneer Prairie Dog Half, 10k & 5k
Prairie Dog Half Series
Saturday 22 Sep 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 22 Sep 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 23 Sep 2018
XTERRA Golden Gate Canyon
This course best exemplifies the spirit of the XTERRA Trail Run offering a 7k and 20K distances
Saturday 29 Sep 2018
Colorado Springs Marathon
Full, half, 5K, Kids K
Saturday 29 Sep 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 29 Sep 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 29 Sep 2018
Horse Gulch Hustle Trail Run
Tackle thirteen miles of rocky, rugged trail in Durango's renowned Horse Gulch
Saturday 29 Sep 2018
Durango Double Half Trail Marathon
Benefits the Women's Resource Center
Saturday 6 Oct 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 6 Oct 2018
Ridgeline Trail Race
Ridgeline Trail 50K, Marathon, Half Marathon and 10K - LiveBIG 5K and Family Adventure Race
Saturday 6 Oct 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 6 Oct 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 6 Oct 2018
Color Me Rad
We're the only 5K that will send you running through RAD color stations
Sunday 7 Oct 2018
Boulder Rez Marathon
Boulder's biggest marathon
Sunday 7 Oct 2018
Louisville Trail Half Marathon
This Flat and Fast Course is sure to be a a PR breaker
Sunday 7 Oct 2018
Costumed K9 Canter & 1 Mile Fun Run
Come show off your dog and his costume!
Saturday 13 Oct 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 13 Oct 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 20 Oct 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 20 Oct 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 27 Oct 2018
Pumpkin Smash and Dash 5K/10K
Get halloween weekend off to a great start with a little cardio and then some pumpkin carving, vendor trick or treats, costume contests, music, youth activities and much, much more
Saturday 27 Oct 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 27 Oct 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 28 Oct 2018
Westy Half and 5k
Walkers and Runners of all abilities welcome
Sunday 28 Oct 2018
Kooky-Spooky 1M, 5K, 10K, & Half Marathon
Superior events from start to finish
Saturday 3 Nov 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 3 Nov 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 3 Nov 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 10 Nov 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 10 Nov 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 17 Nov 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 17 Nov 2018
Pumpkin Pie 5K and 10K
Ends with a huge slice of pie
Saturday 17 Nov 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Thursday 22 Nov 2018
Parker Turkey Day 5k
Thursday 22 Nov 2018
The Pilgrimage Run
Join us on Thanksgiving Day - It's not about turkey!
Saturday 24 Nov 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 24 Nov 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 1 Dec 2018
Colder Bolder
This 5K is a little different, but so are those of us who enjoy running in the cold
Saturday 1 Dec 2018
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 1 Dec 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 1 Dec 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 8 Dec 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 8 Dec 2018
Fa La La 1M, 5K, 10K, & Half Marathon
Superior events from start to finish
Saturday 8 Dec 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 15 Dec 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 15 Dec 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 22 Dec 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 22 Dec 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 29 Dec 2018
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 29 Dec 2018
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Tuesday 1 Jan 2019
Resolute Runner 5k
5k on new year's day
Saturday 5 Jan 2019
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 5 Jan 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 5 Jan 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 12 Jan 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 12 Jan 2019
Polar Prowl 1M, 5K, 10K, & Half Marathon
Superior events from start to finish line
Saturday 12 Jan 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 19 Jan 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 19 Jan 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 20 Jan 2019
Arctic Prairie Dog Half, 10k & 5k
Prairie Dog Half
Saturday 26 Jan 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 26 Jan 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 2 Feb 2019
Nielson Challenge
A monthly 2-mile run with a cool handicap algorithm.
Saturday 2 Feb 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 2 Feb 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 9 Feb 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 9 Feb 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 9 Feb 2019
Heart Throb Run 5k - Arvada
I'm a heart throb!
Saturday 9 Feb 2019
Heart Throb Run 5k - Longmont
I'm a heart throb!
Saturday 16 Feb 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 16 Feb 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 23 Feb 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 23 Feb 2019
Mardi Crawl 1M, 5K, 10K & Half Marathon
Superior events from start to finish line
Saturday 23 Feb 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 2 Mar 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 2 Mar 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 9 Mar 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 9 Mar 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 16 Mar 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 16 Mar 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 16 Mar 2019
Erin Go Braugh 7.77k
Colorado's Luckiest Race!
Saturday 23 Mar 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 23 Mar 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Sunday 24 Mar 2019
Spring Fever 1M, 5K, 10K & Half Marathon
Superior events from start to finish.
Saturday 30 Mar 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 30 Mar 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 6 Apr 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 6 Apr 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
Saturday 13 Apr 2019
Beat the Heat 1M, 5K, 10K, Half and Full Marathon
Superior events from start to finish line.
Saturday 13 Apr 2019
Aspen parkrun
Weekly Free 5km Timed Run
Saturday 13 Apr 2019
South Boulder Creek parkrun
Weekly Free 5km Timed Run
