NOTE: Many races have been cancelled, postponed, or switched to virtual-only due to the ongoing COVID-19 pandemic. We’re doing our best to update information as soon as possible, but check the race’s website for the latest details.
See all December 2021 half marathons across the USA below, or click Race Calendars above to see each state’s calendar. For each race, you’ll find course maps, elevation profiles, reviews and info on how to register.
Wednesday, December 1 – Friday, December 3
| Fri Dec 3 | Tinajas Ultra & Trail Races | Bend TX |
Saturday, December 4
Sunday, December 5
Saturday, December 11
| Sat Dec 11 | Bulow Woods Trail Half Marathon 50K & 4.25-Mile | Ormond Beach FL |
| Sat Dec 11 | Cajun Country Half Marathon 10K & 5K | Lafayette LA |
| Sat Dec 11 | Christmas in Kentucky Half Marathon & 4-Miler | Harrodsburg KY |
| Sat Dec 11 | Fort Desoto Half Marathon & 5K | St. Petersburg FL |
| Sat Dec 11 | Hark the Herald Angels Half Marathon & 10K | Tiburon CA |
| Sat Dec 11 | Holiday Half Marathon | Brooklyn NY |
| Sat Dec 11 | Hoover Dam Marathon Half Marathon 10K & 5K | Boulder City NV |
| Sat Dec 11 | Kiawah Island Golf Resort Marathon & Half Marathon | Kiawah Island SC |
| Sat Dec 11 | La Jolla Half Marathon & 5K | La Jolla CA |
| Sat Dec 11 | NYCRUNS Big Apple Half Marathon | New York NY |
| Sat Dec 11 | Pigtails Run Marathon Half Marathon & 50K | Maple Valley WA |
| Sat Dec 11 | Runfield Half Marathon | Buda TX |
| Sat Dec 11 | Viking Dash Trail Run Half Marathon 10K & 5K – Chicago | Crystal Lake IL |
Sunday, December 12
| Sun Dec 12 | BCS Marathon & Half Marathon | College Station TX |
| Sun Dec 12 | Dallas Marathon Half Marathon & Relay | Dallas TX |
| Sun Dec 12 | First Watch Locomotive Half Marathon & 5K | Kennesaw GA |
| Sun Dec 12 | Florida Holiday Halfathon & 10K | Madeira Beach FL |
| Sun Dec 12 | Islamorada Half Marathon & 10K | Islamorada FL |
| Sun Dec 12 | Mississippi Gulf Coast Marathon & Half Marathon | Gulfport MS |
| Sun Dec 12 | Napa to Sonoma Wine Country Half Marathon | Sonoma CA |
| Sun Dec 12 | Palm Beaches Marathon Half Marathon & 5K | West Palm Beach FL |
| Sun Dec 12 | Runner's Den Scottsdale Half Marathon & 5K | Scottsdale AZ |
| Sun Dec 12 | Santa to the Sea Half Marathon Quarter Marathon 5K & Relay | Oxnard CA |
Saturday, December 18
| Sat Dec 18 | Estrella Mountain Trail Fest Half Marathon 10K & 5K | Goodyear AZ |
| Sat Dec 18 | Irving Frost Half Marathon 10K & 5K | Irving TX |
| Sat Dec 18 | Out with the Old Half Marathon 10K & 5K | Las Vegas NV |
| Sat Dec 18 | Rockin Santa Half Marathon & Sunshine Santa 5K | Knoxville TN |
| Sat Dec 18 | Run for the Ranch Marathon Half Marathon & Relay | Springfield MO |
| Sat Dec 18 | San Diego Holiday Half Marathon | La Jolla CA |
| Sat Dec 18 | The Stars at Night Half Marathon | San Antonio TX |
| Sat Dec 18 | Texas Double Marathon & Half Marathon – Day 1 | Dallas TX |
| Sat Dec 18 | Winter Half Marathon Classic | Grenada Lake MS |
| Sat Dec 18 | Woodside Ramble Trail Half Marathon 35K 50K & 10K | Woodside CA |
Sunday, December 19
| Sun Dec 19 | Holly Jolly Half Marathon 10K & 5K | Camarillo CA |
| Sun Dec 19 | The Longest Night Marathon & Half Marathon | Greenville SC |
| Sun Dec 19 | Mount Dora Half Marathon & 5K | Mount Dora FL |
| Sun Dec 19 | Santa Hustle Galveston Half Marathon & 5K | Galveston TX |
| Sun Dec 19 | Sarasota West Coast Half Marathon & 5K | Sarasota FL |
| Sun Dec 19 | Texas Double Marathon & Half Marathon – Day 2 | Dallas TX |
Sunday, December 26
| Sun Dec 26 | Dunedin Half Marathon 10K & 5K | Dunedin FL |
