Running races in Colorado in Dec 2026

• 

  Toy Drop 5K/10K/15K

  Sat 5 Dec · Loveland, CO · 15K · 10K · 5K

  Toy donation drive along Loveland's bike paths

  Save
• 

  All-Out Fa La La

  Sat 5 Dec · Westminster, CO · Half Marathon · 10K · VIRTUAL 10K · 5K · VIRTUAL 5K

  Flat holiday half with Front Range mountain views

  Save
• 

  Sawmill Trail Runs

  Sat 5 Dec · Pine, CO · 50k · 16-Mile · 8-Mile

  Staunton State Park trails above 8,000 feet

  Save
• 

  Rock Canyon Half Marathon

  Sun 6 Dec · Pueblo, CO · Half Marathon · 5K

  Colorado's 40-year-old half marathon through Rock Canyon

  Save
• 

  Candy Cane Course - Denver

  Sun 6 Dec · Denver, CO · 15K · 10k · 5k · 1 Mile

  Broomfield Running Club's annual holiday run

  Save
• 

  Santa Catch 5k & 10k

  Sat 12 Dec · Windsor, CO · 10k · 5k · 1.6 km
  Save
• 

  Santa's Dash for Ca$h

  Sat 19 Dec · Denver, CO · 5K

  Every finisher gets an envelope — one hides $100

  Save

Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.