2025 Marathons

Boston 2025 Marathons

Your complete Boston 2025 marathon calendar. Find every marathon happening in Boston, Massachusetts in 2025 with comprehensive race details, registration information, and official results, including the 26.True Marathon, Boston Marathon, and Charles River Marathon.

Each marathon listing includes a 2025 marathon guide including dates, locations, course details, weather conditions, and relevant links for registration and more information. We maintain the most current results database, publishing official results on race day, plus complete 2024 results for year-to-year comparison.

26.True Marathon

Boston, Massachusetts

April 19, 2025

🔗 More Details

The 26.True Marathon takes runners on an unsanctioned journey through Boston's lesser-known neighborhoods, starting near the historic Ella Little-Collins house and winding through 14 diverse areas, including a portion of Brookline. Celebrating Boston’s vibrant culture and diversity, this race offers participants a unique marathon experience without road closures, relying on community support from marshals, cheer zones, and hydration stations, as it highlights local cultural landmarks and BIPOC-owned businesses.

Charles River Marathon

Boston, Massachusetts

September 9, 2025

🔗 More Details

The Charles River Marathon features a flat, 2.6-mile loop along Boston's scenic Charles River, offering runners a strategic challenge with ten laps past iconic spots like DCR’s Herter Park. With its lively atmosphere, USATF certification, and a cause-driven mission to support skin cancer awareness, this race combines competitive spirit with community engagement, making it a standout event for both seasoned and aspiring marathoners.