Campgrounds in state, provincial, and national parks often sell out—months in advance. That said, many (thousands) of these campground reservations are cancelled every day. The challenge is in knowing when these spots become available. Campnab is a campsite availability tracker. You tell us when, where, and for how long you want to camp. We’ll notify you (via SMS) when a suitable spot opens up at that campground—so you can nab that sold-out campsite reservation!