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August Half Marathon Calendar

Browse all August 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 August 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 August? We answer some of your most frequently asked questions about August half marathons underneath the calendar.

August Half Marathon Calendar

Dates may be subject to alteration, please check race website.

Filter August Half Marathons

Filter August Half Marathons

Troy’s California Trail Runs logo
August 2, 2025
1-100 runners
Kit Carson, California
August 2, 2025
100-500 runners
Hartford, Wisconsin
HURL Elkhorn Endurance Runs 50M 50k & Half Marathon logo
August 2, 2025
1-100 runners
Helena, Montana
August 2, 2025
100-500 runners
Lakeside, Arizona
August 2, 2025
500-1000 runners
Heber, Utah
Mahomet Half Marathon logo
August 2, 2025
1-100 runners
Mahomet, Illinois
August 2, 2025
100-500 runners
San Leandro, California
John & Jessie Kelley Half Marathon logo
August 2, 2025
500-1000 runners
New London, Connecticut
Rocky Mountain Half Marathon logo
August 2, 2025
1,000-10,000 runners
Estes Park, Colorado
Boulder Rez Marathon logo
August 2, 2025
100-500 runners
Boulder, Colorado
Monsters of the Deep- 5K, 10K, and Half Marathon logo
August 2, 2025
1-100 runners
Santa Monica, California
Point Oneida Run
August 2, 2025
1-100 runners
Lakeshore, Michigan
3H Trail Half Marathon
August 2, 2025
100-500 runners
King George, Virginia
Hero Hustle Logo
August 2, 2025
100-500 runners
Colorado Springs, Colorado
August 2, 2025
100-500 runners
Chattanooga, Tennessee
August 2, 2025
100-500 runners
Riceville, Iowa
August 2, 2025
100-500 runners
Gig Harbor, Washington
Popsicle 5K, 10K and Half Marathon Logo
August 2, 2025
100-500 runners
Colorado Springs, Colorado
Emerald Mountain Epic Marathon & Half Marathon logo
August 2, 2025
100-500 runners
Steamboat Springs, Colorado

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