The 3M Half Marathon and Relay, held each January in Austin, is one of the country’s top half marathon events and also includes a two-leg relay.  This fast‚ downhill race is a perennial favorite with Austin runners. With a 4.8 m/km drop‚ this is a personal record course. Run the half-marathon as an individual or two-person team. Kids 10 and under can participate in the Kids’ Fun Run.