Browse all May Half Marathons in 2025 by state and by city below. For each race, you’ll find the history of the half marathon and the course, the most recent year’s course maps, elevation profiles, runner reviews, pricing, and how to sign up. When you view a race, you might also find contact info if you’re having problems with your registration or need to contact the race directors. We dedicated dozens of hours every month searching for races to include in the May Half Marathons calendar. If you happen to see any half marathon not included, contact us at [email protected] to submit your race. Looking for the best half marathons in May? We answer some of your most frequently asked questions about May half marathons underneath the calendar.