Camping at Hammonasset Beach State Park: The maximum length of stay at this park is twenty-one consecutive days. If you have a 21 day reservation, all members of your camping party and your camping equipment must leave the park for 5 days before you can return.

Camping Reservation Freeze Policy: Any reservation made with a departure date that is more than 11 months from today cannot be changed or cancelled for 18 days after the reservation was made for an inland campground and 25 days for sites at Hammonasset and Rocky Neck.