Browse all 2021 Maine half marathons by month and date below, or view Race Calendars above to view races in other states. For each race, you’ll find course maps, elevation profiles, runner reviews, fees, and info on how to register.
See also: Maine Half Marathons, Listed by City
May 2021
| Mon May 17 | Pine Tree Marathon & Half Marathon | Portland ME |
June 2021
| Sun Jun 6 | Acadia Half Marathon & 10K | Bar Harbor ME |
| Wed Jun 16 | New England Series Marathon Half Marathon 10K & 5K – Day 7 | Sanford ME |
August 2021
| Sun Aug 15 | Trust Trail Fest Half Marathon 10K & 5K | Kennebunkport ME |
| Sun Aug 29 | Blueberry Cove 13.1 Half Marathon | Tenants Harbor ME |
September 2021
| Sun Sep 5 | Boothbay Harbor Fest Half Marathon & 5K | Boothbay Harbor ME |
| Sun Sep 12 | Lake Auburn Half Marathon & 5K | Auburn ME |
| Sat Sep 18 | Bar Harbor Bank & Trust Half Marathon & Fall 5K | Bar Harbor ME |
| Sat Sep 18 | Firebird Trail Races 13-Mile & 50K | Windham ME |
| Sat Sep 18 | Wells Harbor Half Marathon & 5K | Wells ME |
| Sun Sep 19 | Caribou Marathon Half Marathon & Relays | Caribou ME |
| Sat Sep 25 | Mahoosuc Ridge to the River Challenge Marathon Half Marathon & 10K | Newry ME |
| Sat Sep 25 | Waldoboro Half Marathon | Waldoboro ME |
October 2021
| Sat Oct 2 | Kennebunkport Trust Trail Fest Half Marathon | Kennebunkport ME |
| Sun Oct 3 | Gorham Savings Bank Maine Marathon Half Marathon & Relay | Portland ME |
| Sun Oct 3 | Race Through the Woods Half Marathon | Jefferson ME |
| Sat Oct 16 | Pumpkin Harvest Half Marathon | Bethel ME |
| Sun Oct 17 | Mount Desert Island Marathon Half Marathon & Relay | Bar Harbor ME |
| Sat Oct 23 | Shipyard Old Port Half Marathon & 5K | Portland ME |
