San Antonio Marathon

San Antonio Marathon is run in San Antonio, Texas, over December 4-6, 2026. The 5K opens the weekend on Friday evening at 7:00 p.m., and both the marathon (26.2 miles) and the half marathon (13.1 miles) start at 7:15 a.m. on Sunday. The course runs through the streets of the city, taking in lively neighborhoods and the distinctive architecture of downtown, and the route is laid out to pass San Antonio landmarks.

An urban road marathon in early December is a natural end point for a summer and fall training block, and this one draws everyone from 5K beginners to experienced marathoners. If the full is your goal, the standard sixteen-week build with a weekly long run applies, and the flat city streets make even pacing the sensible strategy. The half is the better choice if your longest run this autumn stayed under two hours.