You can mainly find free camping in national forest land (USFS) and BLM locations, you can also camping spots for free in other lands as well such as: State parks. City parks. County parks.
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National Forests and BLM Lands“The general rule,” says Inglis, “is that you can camp just about anywhere that's not a designated site or specifically listed as off-limits for camping.” Check out the website of the forest or BLM unit you plan to visit to find out its individual rules.