Event details subject to change. Please confirm all information via event website.
Week of Events
Sunday, October 19, 2025
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October 19, 2025 -Avery Fall 5K
Avery Fall 5K
Join us for The Avery Fall 5k @ Avery Brewing on October 19, 2025, for a 5k-ish, fun run event that starts and ends at this awesome taproom in Boulder. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft brew at the finish line. Start windows […]
Monday, October 20, 2025
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October 20, 2025 -IACP 5K Fun Run
IACP 5K Fun Run
Lace up and join us for the IACP 5K Fun Run at the 2025 International Association of Chiefs of Police Conference in Denver! This lighthearted, non-competitive run is your chance to kick off the day with fresh air, great views, and even better company. Whether you’re a seasoned runner or just in it for the […]
Tuesday, October 21, 2025
No events on this day.
Wednesday, October 22, 2025
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October 22, 2025 -Crimson Classic 5K
Crimson Classic 5K
The University of Denver's Annual Crimson Classic 5K Run/1.5 Mile Walk will take place on Carnegie Green Lawn. Music, stretching, and snacks will start at 2:15pm. The focus of the Crimson Classic is to celebrate wellness and to bring together our community. This is a free event! Please join us for a selection of wellness […]
Thursday, October 23, 2025
No events on this day.
Friday, October 24, 2025
No events on this day.
Saturday, October 25, 2025
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October 25, 2025Trick or Trot 5K
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October 25, 2025 -Spooky Sprint 5K
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October 25, 2025 -YMCA Creepy Crawl 5K
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October 25, 2025 -Eerie Erie 5K/10K
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October 25, 2025 -Halloween Fun Run
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October 25, 2025 -Boos & Brews Halloween 5K
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October 25, 2025 -Canceled Redrum Fun Run
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October 25, 2025 -Quick Draw @ McGraw Trail Race
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October 25, 2025 -BOO Run 5K
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October 25, 2025 -Spooky Sprint 5K
Trick or Trot 5K
Join the Apex Park and Recreation District Foundation for the inaugural Trick or Trot 5K! Runners and walkers of all ages and abilities are all welcome to join us for this Halloween celebration. Dress in your Halloween best for a chance to win prizes for the costume contest. There will be a separate 1-mile Trick […]
Spooky Sprint 5K
Get ready to lace up your sneakers (or your costume!) for Almost Home’s first-ever Spooky Sprint 5K! Join us on Saturday, October 25, 2025 at Margaret Carpenter Park in Thornton for a morning full of fun, community spirit, and impact. Whether you’re running, walking, or choosing to “sleep in”, every registration helps Almost Home provide […]
YMCA Creepy Crawl 5K
Our annual "spooky themed" race starts at the Palmer Lake Regional Recreation Area. We head down the scenic Santa Fe Trail for a bit then turnaround and finish with a lap around Palmer Lake. This is sure to be a fun day for everyone! Our Kids Monster Dash Fun Run is for kids 12 and […]
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 […]
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 25, 2025, for a 5k-ish, fun run event that starts and ends at this awesome taproom in Denver. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft brew at the finish […]
Canceled Redrum Fun Run
Get ready to lace up your running shoes and unleash your spooky spirit at the Redrum Costume Fun Run 2025! Join hundreds of ghosts, goblins, superheroes, and wacky characters as we dash through the heart of downtown Greeley in a festive 3K that’s more about fun than speed. This family-friendly event welcomes all ages and […]
Quick Draw @ McGraw Trail Race
Come one, come all! And join us in the "Quick Draw @ McGraw" 2 Mile Trail Run, organized and hosted by CRATES Colorado and benefitting McGraw Memorial Park. This challenging trail course located directly south of the Keystone Bridge located inside McGraw Park will give runners of all skill levels a true test of their […]
BOO Run 5K
Costume up and bring your family and friends, we will haunt the town on our 5k route along the river while taking in the beautiful fall colors followed by a big costume contest, seasonal brews, hot chocolate and fun fitness games. Website link: https://grandvalleybrewruns.com/kannah-creek-brewing-company/ FB event page: https://www.facebook.com/events/737334659137680
Spooky Sprint 5K
This eerie evening race winds through a chilling course at the YMCA of Pueblo. The thrilling Halloween themed race is perfect for all ages and fitness levels. Recommended for those who want to have a hauntingly good PR. The best part of Spooky Sprint is you get to wear your costume! Whether you’re running as […]
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