Iowa’s state park campgrounds are filling quickly for the Memorial Day weekend that is nearly three months away. The window to reserve the first major camping holiday of the summer was Feb. 28. Campers seeking sites with electricity will already find slim pickings, according to Best of Boating.

As Iowa campers become accustomed to the reservation system, more and more campsites are being selected before ever leaving the driveway, said Kevin Szcodronski, chief of the Iowa Department of Natural Resources State Parks Bureau.

“We are getting to the point now where if campers do not have a site reserved, they are increasingly reluctant to go. We may be looking at increasing the percentage of reservable sites versus first come sites down the road,” Szcodronski said.

Iowa state park campgrounds had an increase of nearly 40,000 camper nights last year versus 2008.