Search for your next December half marathon at the December Half Marathon Calendar USA website page. The calendar currently has December half marathons 2026, and will have December half marathons 2027 as they roll in. For races that are late in posting their date, we do our best to get those dates updated throughout the year. Updates can also be submitted via our easy "Submit or update a half marathon" button on our home page. We strive to update half marathon dates one ye