The March Half Marathon Calendar is a complete simplistic listing of March half marathons 2026 in the USA.  Currently the March half marathon schedule has 2026 half marathons, and March half marathons 2027 will be updated as they roll in from the 1/2 marathon race organizers. The March Half Marathon schedule identifies trail half marathons and walker friendly half marathons by a (T) symbol and a (W) symbol.  The (T) means it is a TRUE trail half marathon (off road, switchbacks, etc) and a (W) means it is truly "official walker friendly" requiring the half marathon to allow a minimum of 18:32 mile pace, minimum 4 hours for participants to finish the 13.1 mile distance.

The March half marathon calendar features a complete listing of 2026 March half marathons in California, March half marathons in Texas, March half marathons in Colorado, March half marathons in New York, March half marathons in Utah, March half marathons in Illinois, March half marathons in Ohio, March half marathons in Florida, and all other 1/2 marathons in March across the USA.

A half marathon is 13.1 miles (or in kilometers is a 21k). We understand sometimes there will be a slight margin of error up or down when runners run or walk any race distance, however our calendar only is a listing for true half marathons that do all they can to measure their course as an official half marathon 13.1 mile / 21k distance.  Races that are not 13.1 miles, we encourage not to call their race a 1/2 marathon to lessen confusion for runners & walkers looking to participate in a true 1/2 marathon distance. Some runners don't care, but you'd be surprised how many that do.