As of 6/1/2020 - CLOSED til further notice - until an online reservation system is in place.
Blackbird State Forest, located on the border of New Castle and Kent Counties, is Delaware's northernmost state forest. It is only a 30-minute commute from Wilmington and Newark. The ten tracts of Blackbird State Forest are open year-round at no cost to the public for nature walks, hiking, jogging, and horseback riding. The forest features a 1/2-mile, wheelchair-accessible wildlife and nature interpretation trail on the Tybout Tract as well as the Blackbird Education Center on the Meadows Tract.
This is a good free state forest with maybe 10 (or less) designated tent-camping sites, and designated areas for deer hunting. Each campsite features a picnic table or two, and a fire pit, plus one bundle of firewood. The ground is dirt covered with woodchips and sometimes evergreen needles -- pretty easy to sleep in a tent. There are a couple portapotties in the camping area, which are a few feet from one campsite, or a few blocks from another. There is one water pump. And there are plenty of hiking trails in the state forest, complete with mushrooms, and deer-hunting-stands.
RV camping is not encouraged. Horseriding is encouraged. And you may regret not brining mosquito repellent. The blood-suckers are relentless.
My only beef is that it's a legitimate campground, which means, neighbors. But the neighbors aren't unreasonably close, so it's actually pretty good.