Ereñotzuko Mendi Lasterketa is a mountain running race in Ereñotzu, starting at 10:00 in the morning from the neighborhood fronton. It uses its regular 11.75-kilometer route and sits just before the San Antonio festivities, so it works as a local sporting opener to the celebrations.
The race is small and capped at 200 runners, which gives it more of a neighborhood race feel than a big-city event. It is on its thirteenth edition, registration is handled through rockthesport.com, and the entry fee is 18 euros.