Hog Island Oyster Co. - Tough Mudder 5K Team Participant. Saturday, October 5 Everyone knows the west coast is the best coast, that's why Tough Mudder 5K NorCal at Sonoma Raceway is gonna be the most epic bash of the year. Only an hour from downtown San Fransisco, you and your muddin crew will cruise over grassy knolls and take in expansive beautiful vistas before you get wild at the Mudder Village After Party. This is no ordinary fun run. Tough Mudder 5K is an experience. 3 Miles - 13 Obstacles. With a focus on teamwork, fitness, and fun. Kick back after you've completed with live entertainment, epic games and challenges, authentic local food, free beer, and a never-ending supply of Mudder Nation camaraderie. Tough Mudder 5K is untimed, so theres no pressure, no judgement. Its a like-minded community of people whove chosen to do something different with their weekend, get out of their comfort zone, make new friends - and have the time of their lives doing it.