Marathons in August 2026: All 34 US & International Races

August is the bridge between summer base building and fall race-prep. Mountain ultras, twilight races, and altitude training camps all peak this month. It’s also when fall-marathon training plans hit their highest mileage — making any August race a perfect mid-cycle tune-up.

Below is the complete What Race To Run directory of August races for the year ahead — 34 total events across 19 US races and 15 international destinations. Click any race for course details, registration links, and race-weekend logistics.

Why Race in August?

August is the bridge between summer base building and fall race-prep. Whether you’re targeting a PR, planning a destination weekend with family, or just looking for a great training tune-up, August delivers options across every distance and terrain.

Marquee August Races

August highlights include Aspen Backcountry Marathon, Craft Classic Seattle, Lululemon SeaWheeze Half Marathon, Haulin Aspen Trail Marathon, Georgetown to Idaho Springs Half Marathon, plus dozens of regional half marathons, 5Ks, trail races, and fun runs across the United States and around the world.

All August Races on WRTR

Every August race in our database, sorted by date. Distance markers in the right column indicate the primary race type — many events also offer companion shorter distances like 5K, 10K, and family fun runs.

Planning a August Destination Race?

Many of the August events listed above are part of a full race weekend with expos, shake-out runs, and post-race celebrations. Book accommodation early — popular August races like the marquee marathons fill nearby hotels 4-6 months ahead. Check each event page for registration deadlines, qualifying times (for Boston-qualifier races), and bib transfer policies.

New races added every week — submit a August race to be included.