He joined Roush-Fenway Racing this season and has four top-10s heading into Saturday's finale. He's 14th in the Nationwide standings and has a 21.4 average finish.
"I hate to quit and I hate to fail, but sometimes things work out as they should," Pastrana wrote. "I've never been able to figure out the finesse required in pavement racing and that is disappointing, but I'm looking forward to driving more rally and racing more off-road trucks and there will be some announcements on those fronts shortly! My wife is excited to get back to skating on the Nitro Circus Live Tour and I'm excited to spend some quality time with my girls."