What is the minimum age to participate in the Santa Barbara Wine Country Half Marathon? Twain December 30, 2018 19:26 Participants must be 13 years old on race day to participate in the Santa Barbara Wine Country Half Marathon. Related articles What is the schedule for the Santa Barbara Wine Country Half Marathon? How early should I arrive on race day? What are the pace groups? What is the course time limit? How do I get to the start line?