Radiohead has confirmed the second leg of its first North American amphitheater tour in five years. Though the influential English group played Bonnaroo and a handful of theaters in 2006, the group has not hit the North American shed circuit since 2003. As previously reported, Radiohead will hit the road this spring for a series of shows, before heading across the pond for a series of European gigs in June and July. Radiohead will then kick off an extended summer tour at Chicago's Lollapalooza festival on August 1, before making stops in Noblesville, IN (8/3), Cuyahoga Falls, OH (8/4),  Montreal (8/6), Camden, NJ (8/12), Mansfield, MA (8/13), Toronto (8/15),  Vancouver (8/19) Auburn, WA (8/20), Los Angeles (8/24-25), Chula Vista (8/27) and Santa Barbara, CA (8/28). Along the way, the group will also appear at New Jersey’s All Points West (8/8-9) and San Francisco’s Outside Lands (8/22). Grizzly Bear will open for the group from August 3-15, while Liars will supply support duties from August 19-28.