December 2026 races in Denver–Boulder

There are 13 running events listed in Denver–Boulder for December 2026 — 12 5K, 7 10K, 5 Half Marathon, 1 Marathon, 1 Trail Run — starting with Sawmill Trail Runs on Sat, Dec 5, 2026. Every listing shows the date, venue, and distances, with a direct link to registration.

• Sat, Dec 5, 2026 Sawmill Trail Runs 12102 S Elk Creek Rd · Pine, CO · From $60 Trail Run Trail
• Sat, Dec 5, 2026 All-Out Fa La La 10170 Church Ranch Way · Westminster, CO · From $35 5K10KHalf Marathon Road
• Sat, Dec 5, 2026 Toy Drop 1480 Cascade Ave · Loveland, CO · From $30 5K10K Road
• Sun, Dec 6, 2026 Candy Cane Course - Denver Westfield Village Park · Westminster, CO · From $22 5K10K Road
• Sat, Dec 12, 2026 Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Dec 12, 2026 Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf MarathonMarathon Road
• Sat, Dec 12, 2026 Santa Shuffle 5K 8116 W Bowles Ave · Littleton, CO · From $35 5K Road
• Sat, Dec 12, 2026 WinterFest 5k & Fun Run 3498 E 112th Ave · Thornton, CO · From $12 5K Road
• Sun, Dec 13, 2026 2026 Jingle Bell Run - Colorado 701 S Franklin St · Denver, CO · From $25 5K Road
• Sat, Dec 19, 2026 Santa's Dash for Ca$h Utica Street & West 17th Ave · Denver, CO · From $29 5K Road
• Sun, Dec 20, 2026 Ugly Sweater 5K Washington Park · Denver, CO · From $30 5K Road
• Sat, Dec 26, 2026 A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Dec 26, 2026 New Year's Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road

Quick answers

How many races are there in Denver–Boulder in December 2026?

13 running events are listed in Denver–Boulder for December 2026, from Sawmill Trail Runs on Sat, Dec 5, 2026 to New Year's Run 5K/10K/13.1 DENVER/AURORA on Sat, Dec 26, 2026. Every listing links directly to registration.

What distances can I race in Denver–Boulder in December?

The December 2026 calendar in Denver–Boulder includes 12 5K, 7 10K, 5 Half Marathon, 1 Marathon, 1 Trail Run.

What is the first race of December 2026 in Denver–Boulder?

Sawmill Trail Runs on Sat, Dec 5, 2026 at 12102 S Elk Creek Rd.