Browse all October Half Marathons in 2026-2027 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 October Half Marathons calendar. If you happen to see any half marathon not included, contact us at info@halfmarathons.net to submit your race. Looking for the best half marathons in October? We answer some of your most frequently asked questions about October half marathons underneath the calendar.