Longmonster Dash 5k
The Longmonster Dash: Longmont Chamber 5K & Costume Contest hits Longmont on Saturday, October 17. Race a 5K, strut your costume, and stick around for the finish expo where local businesses, snacks, and bragging rights await. Fast or fun-paced, everyone’s welcome. Prizes for top finishers and best costumes alike. Longmont, let’s dash.
Something Spooky This Way Runs!
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Join the Longmont Chamber of Commerce for the inaugural Longmonster Dash, a Halloween-themed 5K and costume contest on Saturday, October 17, 2026.
Runners and walkers of all paces are welcome, with age-group awards for top finishers. After the race, our costume contest takes center stage, with categories including Best Overall, Best Family, Best Group, and Spookiest Costume. Stick around for our finish expo and connect with local businesses and community organizations.
Whether you’re racing for time or dressing to win, the Longmonster Dash is a morning built around community, connection, and Longmont pride!
Longmonster Dash is Presented By
Event Details
October 17, 2026
7 am - 12 pm
Longmont, CO
Race location within Longmont will be announced soon!