Event details subject to change. Please confirm all information via event website.
Week of Events
Sunday, October 25, 2026
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October 25, 2026 -Beware the Bear Trail Races
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October 25, 2026 -The Stride 5K/10K
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Featured October 25, 2026 -Featured Ghosts & Goblins 5K/10K
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October 25, 2026 -Odyssey Odyssey 5K
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October 25, 2026 -Five Alarm 5K
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October 25, 2026 -MonsterDASH
Beware the Bear Trail Races
Run the original Bear Creek Lake Park trail race - the Beware the Bear Trail Races - on October 17th. This trail race consists of a 14.2K or a 5K. Or do them both with the double! There is also a kids 1K.
The Stride 5K/10K
You’re invited to The Stride, a family-friendly 5K, 10K, Kids Fun Run, and Wellness Expo in Littleton on October 24th. Benefitting the Littleton Public Schools Foundation, this event brings together the community for a great cause.
Ghosts & Goblins 5K/10K
The Ghosts & Goblins 5K/10K is a family, friendly event to celebrate the upcoming holiday season. Start your holiday traditions with a fun morning of fitness and friends by joining us at Denver’s City Park. Runners and walkers will complete a timed 5K course through the park, then enjoy a finisher’s medal, a fun vendor […]
Odyssey Odyssey 5K
The Odyssey Odyssey Fun Run is entering its 9th year. It has always been centered around having fun and exercising our bodies. It is an all-inclusive event, which is why all the races are FREE to participate in. We will be accepting donations for entrance fees but that is not a requirement for participation. The […]
Five Alarm 5K
We are the Colorado Brewery Running Series and we run for beer (and chili)! Join us for our Five Alarm 5k & Chili Cook-Off at Bierstadt Lagerhaus in Denver for a 5k-ish course that starts and ends at this awesome brewery! Weave through the surrounding area at whatever pace you like, no matter what, there’s a […]
MonsterDASH
Colorado's Longest running Halloween race....since 2006, we have changed the THEME to this race year after year! We wil have scary music and a CIRCUS Themes Expo at the start/finish. Hired Clowns on site and a circus atmosphere with Games, Hot Dogs, Pop Corn and Drinks. Stay for the Party and have a fun time. […]
Monday, October 26, 2026
No events on this day.
Tuesday, October 27, 2026
No events on this day.
Wednesday, October 28, 2026
No events on this day.
Thursday, October 29, 2026
No events on this day.
Friday, October 30, 2026
No events on this day.
Saturday, October 31, 2026
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October 31, 2026 -Narrowleaf Lake Run
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October 31, 2026 -Spooky Sprint Half Marathon
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October 31, 2026 -Colorado 24 Hour Run
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October 31, 2026 -HRCA Backcountry Wilderness Half
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October 31, 2026 -Foundry Halloween 5K
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October 31, 2026 -Eerie Erie 5K/10K
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October 31, 2026 -I Ain’t Scared (of 5K)
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October 31, 2026 -EAPL Zombie Run 5K
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October 31, 2026 -Halloween Fun Run
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October 31, 2026 -Boos & Brews Halloween 5K
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October 31, 2026 -Halloween Peach 5K
Narrowleaf Lake Run
Brisk autumn running in Colorado – OH YEA! Join us for a family fun event with three distance options at the beautiful Boyd Lake State Park venue. What’s a “Narrowleaf” you ask? The Narrowleaf Cottonwood Trees are the most densely populated tree species at Boyd Lake State park. We thought the name was fitting and […]
Spooky Sprint Half Marathon
Join us for the annual Spooky Sprint 5k/10k & Half Marathon! A fun, Halloween-themed event that is perfect for the whole family.
Colorado 24 Hour Run
Welcome to the Colorado 24 Hour Run! We aim to provide a fun, welcoming race experience that allows everyone to find a challenge, no matter where you’re at on your running journey. Want to see how far you can go in 6, 12 or 24 hours? Or achieve a new furthest distance? What about setting […]
HRCA Backcountry Wilderness Half
2023 marks the 15th Annual Backcountry Wilderness Half Marathon in Highlands Ranch! This 13.1-mile scenic trail run utilizes the Douglas County East/West trail and the beautiful Highlands Ranch Community Association's Backcountry Wilderness Area trails. Prize Money will be awarded to the top 3 male and female overall winners in the following amounts! 1st= $400 2nd= […]
Foundry Halloween 5K
A relatively new event to close out the Steamboat Springs Running Series season, bringing people of all ages together to celebrate Halloween in a safe, sober and fun way. The Foundry Treatment Center provides an opportunity for lasting recovery through an integrative body, mind and spirit treatment program. Comfortably located in the majestic Rocky Mountains […]
Eerie Erie 5K/10K
The world-famous Eerie Erie is a Halloween-themed 5k and 10k race that runs through historic downtown Erie and takes advantage of our beautiful trail system that weaves along the Coal Creek open space areas. The 10k passes by scenic Pleasant Hill Cemetery with panoramic views and where friendly spirits can’t wait to visit this year’s […]
I Ain’t Scared (of 5K)
Dress up and run spooky and silly at the I Ain't Scared (of 5k) in Thornton! Fun music, Halloween snacks and costumes galore!! This event only comes around once every few years when Halloween lands on a weekend. You don't want to miss it! Every racer gets a T-shirt with GLOW IN THE DARK printing […]
EAPL Zombie Run 5K
Run, walk, crawl family event supporting the Evergreen Animal Protective League (EAPL). Bring your family (doggies are welcome)! We strongly encourage your spookiest, ghoulish, Halloween gear! Come out and HOWL with EAPL. The race is set in the mountains West of Denver, the course begins and ends at Buchanan Rec Center Ball Fields. The course […]
Halloween Fun Run
This Halloween, join us for a spooky 5k or 1 mile loop through the Pioneer Cemetery in Idaho Springs!! Try for a PR or take a leisurely stroll as you trick or treat with the ghouls in the graveyard. DON'T FORGET TO DRESS UP! Our Halloween costume contest gives you even more reason to rock […]
Boos & Brews Halloween 5K
Join us for The Boos & Brews Halloween 5k @ Number Thirty Eight on October 31, 2026, for a 5k run that starts and ends at this awesome taproom in Denver. Run, walk, jog - whatever goes! Complete the course and celebrate with a cold, delicious beer at the finish line. Start times will be […]
Halloween Peach 5K
The ladies of Cedar Mesa Club are hosting their 2nd annual peach-filled event to raise money for local scholarships. Come join your neighbors for a scenic 5K (3.1 mile) loop round Cedar Mesa. Start line: The course starts and ends at the Colorado Historic Cedar Mesa Clubhouse at 15637 Peach Rd in Cedaredge. Parking is […]
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