Running Races in Thornton, CO

Thornton, Colorado has 5 upcoming running races, from 5Ks to marathons. Browse by vibe, difficulty, and community fit to find the right race for you.

5 upcoming races listed

A fully supported, low-cost 20-mile training run designed to help you prepare for your spring marathon or half marathon.

Course · Hilly · Timed race

Gallop into summer fun at this unicorn-themed 5k, complete with a flashy medal and balloon creations.

Course · Hilly · Timed race

Experience a unique handicap start 10K race with the Rocky Mountain Road Runners, offering a welcoming and low-cost competitive vibe.

Course · Mixed · Hilly · Timed race

A rare Halloween 5k in Thornton, CO, featuring costumes, spooky fun, and glow-in-the-dark swag.

Course · Hilly · Timed race

Embrace the holiday spirit with a spirited run and a full winter festival experience, complete with ice skating and Santa visits.

Course · Hilly · Walkers welcome

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