The inaugural Alamo 13.1 Half Marathon was launched in March 2012 to fill a unique gap in San Antonio’s racing scene. While national race series frequently passed through the city, none truly captured the spirit and culture of San Antonio. That changed with Alamo 13.1—a race envisioned and organized by a native Texan, determined to create an event that reflected the heart of the community. Set in the vibrant downtown and steeped in rich history, the race was designed to honor the legendary 1836 Battle of the Alamo and its fallen heroes. From this vision, Alamo 13.1—and what would become the annual "Run the Alamo" race weekend—was born.

As only a race inspired by a historic battle should, the Alamo 13.1 begins with a thunderous live cannon blast and multiple musket volleys to signal the start. From there, runners embark on a journey through San Antonio’s rich history. The course winds past the iconic Alamo, along historic Houston Street, through San Pedro Cultural Park, by the stunning San Fernando Cathedral, the tree-lined King William District, several World Heritage Missions, and the famous River Walk.

Post-race, finishers are rewarded with medals that honor the rich historical legacy of the Alamo. Over the years, these medals have featured meaningful designs—from the six flags that have flown over Texas to detailed replicas of cannons used during the 1836 battle. Each year, the event also pays tribute to the fallen heroes of the Alamo by incorporating their names into the race experience, often printed on the medal ribbons or featured on the official race shirts. It’s a powerful reminder that this is more than just a run—it’s a moving tribute to Texas history.

With the introduction of the full marathon route in 2018, the event evolved into a two-day “Run the Alamo” race weekend. Originally, the 5K and 10K Donut Dash races took place alongside the Alamo 13.1 Half Marathon. However, due to overwhelming enthusiasm from the running community, the format was reimagined to offer a greater challenge. Runners now have the option to complete a shorter race on the first day—either a 5K or 10K—followed by a half or full marathon the next. Those who rise to the occasion earn an exclusive “Alamo Duel” medal, celebrating their endurance and spirit.