Yosemite is INCREDIBLY popular all summer long, from May til September, and especially so for weekends. The campgrounds that aren't first-come first-served fill up months in advance, sometimes on the very first day that reservations/permits become available. I personally get a site in the valley every year for May, and if I don't do it within 5 minutes of the reservation system opening up, therby cyancey76 - General Discussion