See all May 2019 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.
Saturday, May 4
| Sat May 4 | 500 Festival Mini Marathon & 5K | Indianapolis IN |
| Sat May 4 | Door County Half Marathon & Nicolet Bay 5K | Fish Creek WI |
| Sat May 4 | Festival Foods Grandad Half Marathon 5K & Relay | La Crosse WI |
| Sat May 4 | I Ran Flagship Marathons Series – Jamaica | San Antonio TX |
| Sat May 4 | IronHorse Half Marathon 10K & 5K | Riceville IA |
| Sat May 4 | New Prague Half Marathon 10K & 5K | New Prague MN |
| Sat May 4 | Provo City Half Marathon & 5K | Provo UT |
| Sat May 4 | RunBlossom Half Marathon & 5K | Cañon City CA |
| Sat May 4 | Strolling Jim Run Marathon Half Marathon 40-Mile & 10K | Wartrace TN |
| Sat May 4 | Turkey Hill Country Classic Half Marathon 10K & 5K | Washington Boro PA |
| Sat May 4 | Whiskey Row Marathon Half Marathon & 10K | Prescott AZ |
| Sat May 4 | Wisconsin Marathon Half Marathon & 5K | Kenosha WI |
Sunday, May 5
Saturday, May 11
Sunday, May 12
| Sun May 12 | Brooklyn Mother's Day Half Marathon | Brooklyn NY |
| Sun May 12 | Kings and Queens Half Marathon & 4-Mile | Pewaukee WI |
| Sun May 12 | Mother's Day Half Marathon & 5K | Kirkland WA |
| Sun May 12 | USA Beach Running Championships Half Marathon | Cocoa Beach FL |
| Sun May 12 | Western Massachusetts Mother's Day Half Marathon | Whately MA |
| Sun May 12 | Wildflower Marathon Half Marathon & 7-Mile | Bastrop TX |
Monday, May 13 – Friday, May 17
| Mon May 13 | Pine Tree Marathon & Half Marathon | Portland ME |
| Tue May 14 | Granite State Marathon & Half Marathon | Nashua NH |
| Wed May 15 | Maple Leaf Marathon & Half Marathon | Springfield VT |
| Thu May 16 | Old Colony Marathon & Half Marathon | Westfield MA |
| Fri May 17 | Nutmeg State Marathon & Half Marathon | Hartford CT |
Saturday, May 18
| Sat May 18 | Beaverhead Marathon & Half Marathon | Dillon MT |
| Sat May 18 | Big Lake Half Marathon | Alton NH |
| Sat May 18 | Fargo Marathon Half Marathon & 10K | Fargo ND |
| Sat May 18 | Geist Half Marathon 10K & 5K | Fishers IN |
| Sat May 18 | Governor's Cup Road Race Half Marathon | Columbia SC |
| Sat May 18 | I Ran Flagship Marathons Series – Jordan | San Antonio TX |
| Sat May 18 | Madeline Island Marathon & Half Marathon | La Pointe WI |
| Sat May 18 | Martha's Vineyard Marathon & Half Marathon | Martha's Vineyard MA |
| Sat May 18 | Nitro Trail Half Marathon 10K & 5K | Pinole CA |
| Sat May 18 | Red Island Marathon & Half Marathon | Warwick RI |
| Sat May 18 | Run for 57th AHC Half Marathon & 5K | Possum Kingdom Lake TX |
| Sat May 18 | St. Michaels Running Festival Half Marathon & 5K | St. Michaels MD |
| Sat May 18 | Uff Da Run Half Marathon & 5K | Woodville WI |
| Sat May 18 | Zions Bank Ogden Marathon Half Marathon & Relay | Ogden UT |
Sunday, May 19
| Sun May 19 | Capital City Marathon Half Marathon & 5-Mile | Olympia WA |
| Sun May 19 | Cellcom Green Bay Marathon Half Marathon & Relay | Green Bay WI |
| Sun May 19 | Chicago Spring Half Marathon & 10K | Chicago IL |
| Sun May 19 | Colfax Marathon Half Marathon & Urban 10-Miler | Denver CO |
| Sun May 19 | Lake Balboa Half Marathon 10K & 5K | Van Nuys CA |
| Sun May 19 | Marine Corps Historic Half Marathon | Fredericksburg VA |
| Sun May 19 | Rite Aid Cleveland Marathon Half Marathon & 10K | Cleveland OH |
| Sun May 19 | Run on the River Half Marathon | Astoria OR |
| Sun May 19 | Superhero Half Marathon & Relay | Morris Township NJ |
| Sun May 19 | Surfer's Path Marathon & Capitola Half Marathon | Santa Cruz CA |
| Sun May 19 | Wallis Sands Half Marathon | Rye NH |
Monday, May 20 – Friday, May 24
| Fri May 24 | I Ran Marathons Memorial Heroes Weekend – Navy | San Antonio TX |
Saturday, May 25
| Sat May 25 | Bayshore Marathon Half Marathon & 10K | Traverse City MI |
| Sat May 25 | Downhill @ Dawn Half Marathon & 5K | Ridgecrest NC |
| Sat May 25 | I Ran Flagship Marathons Series – Kazakhstan | San Antonio TX |
| Sat May 25 | I Ran Marathons Memorial Heroes Weekend – Air Force | San Antonio TX |
| Sat May 25 | Medina Half Marathon & 5K | Medina OH |
| Sat May 25 | Oregon Spring Half Marathon | St. Paul OR |
| Sat May 25 | Road to Carthage Marathon Half Marathon 5K & Relay | Nauvoo IL |
| Sat May 25 | Sweet Southern Discomfort Marathon Half Marathon 10K & 5K – Georgia | Calhoun GA |
| Sat May 25 | Viking Dash Trail Run Half Marathon 15K 10K & 5K – Louisville | Fairdale KY |
Sunday, May 26
| Sun May 26 | Badass Texas Half Marathon 10K & 5K | Waco TX |
| Sun May 26 | Boston's Run to Remember Half Marathon & 5K | Boston MA |
| Sun May 26 | Buffalo Marathon Half Marathon & Relay | Buffalo NY |
| Sun May 26 | Crossroads of Northwest Indiana Marathon & Half Marathon | Lowell IN |
| Sun May 26 | Hibiscus Half Marathon 15K & 5-Mile | Honolulu HI |
| Sun May 26 | I Ran Marathons Memorial Heroes Weekend – Marine | San Antonio TX |
| Sun May 26 | Mountains 2 Beach Marathon & Half Marathon | Ventura CA |
| Sun May 26 | Sweet Southern Discomfort Marathon Half Marathon 10K & 5K – Tennessee | East Ridge TN |
Monday, May 27 – Thursday, May 31
| Mon May 27 | Grand Run Half Marathon & 5K | Westfield IN |
| Mon May 27 | I Ran Marathons Memorial Heroes Weekend – Army | San Antonio TX |
| Mon May 27 | Sweet Southern Discomfort Marathon Half Marathon 10K & 5K – Alabama | Guntersville AL |
