The January Half Marathon Calendar is a complete simplistic listing of January half marathons 2026 in the USA.  Currently the January half marathon schedule has 2026 half marathons, and January half marathons 2027 will be updated as they roll in from the 1/2 marathon race organizers. The January 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 2026 listing of half marathons in January features a complete listing of January half marathons in California, January half marathons in Texas, January half marathons in Colorado, January half marathons in New York, January half marathons in Utah, January half marathons in Illinois, January half marathons in Ohio, January half marathons in Florida, and all other 1/2 marathons in January 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.