National Forests (NF or USNF) in the United States are popular boondocking destinations, managed by the US Forest Service.
It is common for National Forest (NF) boondocking to be limited to 14-16 days in one spot, after which one must move at least X miles away; 5 and 25 miles are common limits. Some areas have no stated length of time for return; others say days, one month, or one year. Some NFs like the Tonto National Forest require passes.
The US Forest Service provides geo-enabled PDFs for all locations. You can also use the Interactive Visitor Map to find places to stay.
National Grasslands are similar lands also managed by the USFS.
Regulations
In some areas only stoves with on/off valves are allowed: “The use of commercially available portable lanterns, stoves, or heating equipment that utilize gas or pressurized liquid fuel is allowed. The stove must have an ON/OFF switch. No alcohol stoves. No hexamine or solid fuel cubes.[1]”
