It's a sure sign warmer weather will eventually return to Iowa.
Reservations for campsites at nine state campgrounds for Memorial Day weekend have all been claimed.
Kevin Szcondronski, the parks chief for the Iowa Department of Natural Resources, said advance reservation camp sites are already gone for Memorial Day at Lake Anita, Lake Ahquabi, the beach campground at Brushy Creek, Elk Rock, Ledges, Maquoketa Caves, Viking Lake, Prairie Rose and Lake of Three Fires.
He said more campers are using the reservation system each year to get the sites they want.
"My impression is that sites are going quicker this year," Szcodronski added.
The Web-based system lets people stake claim to campsites three months in advance.
Iowans who didn't get a reservation aren't necessarily out of luck. Half of the campsites are held open on a first-come first-serve basis.
The state has more than 50 campgrounds offering 5,000 sites.