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 August 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.
Sunday, August 1
| Sun Aug 1 | Badger Trail Race Marathon Half Marathon 50-Mile & 50K | Belleville WI |
| Sun Aug 1 | BearFest Marathon Half Marathon & 5K | Wrangell AK |
| Sun Aug 1 | Hoot Half Marathon & 10K | Lewis Center OH |
| Sun Aug 1 | Skyline Endurance Run 50K & Half Marathon | Castro Valley CA |
| Sun Aug 1 | Triple Threat Half Marathon 5K & 1-Mile | Rockport MA |
Monday, August 2 – Friday, August 6
| Tue Aug 3 | Alaska Series Marathon Half Marathon 10K & 5K – Day 1 | Juneau AK |
| Wed Aug 4 | Alaska Series Marathon Half Marathon 10K & 5K – Day 2 | Juneau AK |
| Thu Aug 5 | Alaska Series Marathon Half Marathon 10K & 5K – Day 3 | Juneau AK |
| Fri Aug 6 | Alaska Series Marathon Half Marathon 10K & 5K – Day 4 | Juneau AK |
Saturday, August 7
| Sat Aug 7 | 3H Trail Half Marathon | King George VA |
| Sat Aug 7 | Beast of Big Creek Trail Race | Hoodsport WA |
| Sat Aug 7 | Bluegrass Reaper Challenge Marathon Half Marathon 50K & 10K | Berea KY |
| Sat Aug 7 | Catherine Creek Half Marathon 5K & 1-Mile | Union OR |
| Sat Aug 7 | Eagle Creek Trail Marathon Half Marathon & Quarter Marathon | Indianapolis IN |
| Sat Aug 7 | Haulin' Aspen Marathon Half Marathon & 6.5-Mile | Bend OR |
| Sat Aug 7 | Hobble Creek Half Marathon | Mapleton UT |
| Sat Aug 7 | The Legend Half Marathon 10-Mile & 5-Mile | Laingsburg MI |
| Sat Aug 7 | National Watermelon Day Half Marathon 10K & 5K | Waukesha WI |
| Sat Aug 7 | Ocean Beach Kelley Half Marathon | New London CT |
| Sat Aug 7 | Old Toby's Lost Trail Half Marathon | Sula MT |
| Sat Aug 7 | Point to Point Half Marathon | Montpelier VT |
| Sat Aug 7 | Riley Trails Marathon Half Marathon & 10K | Holland MI |
| Sat Aug 7 | Suncadia Half Marathon & 5K | Cle Elum WA |
| Sat Aug 7 | Wapsi Wiggle Half Marathon & 5K | Riceville IA |
Sunday, August 8
| Sun Aug 8 | Beaverton Half Marathon 10K & 5K | Beaverton OR |
| Sun Aug 8 | Emerald Mountain Epic Marathon & Half Marathon | Steamboat Springs CO |
| Sun Aug 8 | Funky Monkey Half Marathon & 5K | North Kingstown RI |
| Sun Aug 8 | Little Miami Half Marathon & 10K | Morrow OH |
| Sun Aug 8 | Run for the Elk Half Marathon | Benezette PA |
| Sun Aug 8 | Treasured Haven Farm Veggie Run Half Marathon | Rush City MN |
Saturday, August 14
| Sat Aug 14 | Boulder Rez Marathon 3/4 Marathon Half Marathon & 10K | Boulder CO |
| Sat Aug 14 | BurliMOT Half Marathon & 5K | Minot ND |
| Sat Aug 14 | Cheesehead Run Half Marathon 5K & Relay | Hilbert WI |
| Sat Aug 14 | Crater Lake Rim Runs Marathon Half Marathon & 6.7-Mile | Crater Lake OR |
| Sat Aug 14 | Dragon's Den Half Marathon 10K & 5K | San Antonio TX |
| Sat Aug 14 | Goodyear Half Marathon & 10K | Akron OH |
| Sat Aug 14 | Hot Trot Half Marathon 10K & 5K | Dallas TX |
| Sat Aug 14 | Med Bow Rail Marathon & Half Marathon | Laramie WY |
| Sat Aug 14 | Run Elevated Half Marathon | Sandy UT |
| Sat Aug 14 | Run the Rockies Trail Half Marathon & 10K | Frisco CO |
| Sat Aug 14 | Skyline Mountain Marathon Half Marathon & 55K | Eden UT |
| Sat Aug 14 | Slate Valley Scramble Half Marathon & 8K | Poultney VT |
Sunday, August 15
| Sun Aug 15 | America's Finest City Half Marathon & 5K | San Diego CA |
| Sun Aug 15 | Bridge of the Gods Half Marathon 10K & 5K | Cascade Locks OR |
| Sun Aug 15 | Geneva Half Marathon | Geneva NY |
| Sun Aug 15 | Trust Trail Fest Half Marathon 10K & 5K | Kennebunkport ME |
Saturday, August 21
Sunday, August 22
| Sun Aug 22 | Anchorage RunFest Skinny Raven Half Marathon | Anchorage AK |
| Sun Aug 22 | E.T. Full Moon Midnight Marathon Half Marathon 51K 10K & 5K | Rachel NV |
| Sun Aug 22 | Emerald City Half Marathon Quarter Marathon & 5K | Dublin OH |
| Sun Aug 22 | Erie Half Marathon & 5K | Erie CO |
| Sun Aug 22 | Fall Creek Falls Half Marathon 10K & 5K | Pikeville TN |
| Sun Aug 22 | Iron Horse Half Marathon | North Bend WA |
| Sun Aug 22 | Kickin' Assphault Half Marathon & 10K | Great Falls MT |
| Sun Aug 22 | Leading Ladies Marathon & Half Marathon | Spearfish SD |
| Sun Aug 22 | Viking Dash Trail Run Half Marathon 10K & 5K – Hell | Gregory MI |
Saturday, August 28
| Sat Aug 28 | Angel Island Half Marathon & 10K | Tiburon CA |
| Sat Aug 28 | Louisville Trail Race Half Marathon 10K & 5K | Louisville CO |
| Sat Aug 28 | Mesa Falls Marathon Half Marathon 10K & 5K | Ashton ID |
| Sat Aug 28 | Moonlight on the Falls Marathon Half Marathon & Quarter Marathon | Davis WV |
| Sat Aug 28 | Mount Nebo Marathon Half Marathon & 5K | Payson UT |
| Sat Aug 28 | Motus Green River Lake Half Marathon & 10K | Campbellsville KY |
| Sat Aug 28 | Nebraska State Fair Marathon Half Marathon & 5K | Grand Island NE |
| Sat Aug 28 | Porters Half Marathon 10K & 5K | Draper UT |
| Sat Aug 28 | Rock the Parkway Half Marathon & 5K | Kansas City MO |
| Sat Aug 28 | Scheels Healthy Human Race Half Marathon & 5K | Rochester MN |
| Sat Aug 28 | Sunrise Half Marathon | Sunrise FL |
| Sat Aug 28 | Thirsty 13 Half Marathon | Durango CO |
| Sat Aug 28 | Top of Utah Half Marathon | Logan UT |
Sunday, August 29
| Sun Aug 29 | Black Diamond Express Half Marathon & 5K | Mendon NY |
| Sun Aug 29 | Blueberry Cove 13.1 Half Marathon | Tenants Harbor ME |
| Sun Aug 29 | Mendocino Running Festival Half Marathon & 10K | Mendocino CA |
| Sun Aug 29 | Sioux Falls Marathon Half Marathon & 5K | Sioux Falls SD |
| Sun Aug 29 | Wee-Chi-Tah Half Marathon & 10K | Wichita Falls TX |
