The NPS doesn't have the data as you can camp (fairly) freely without permits. I've done it a few times before (all in the fall through spring). The major issu

The NPS doesn't have the data as you can camp (fairly) freely without permits. I've done it a few times before (all in the fall through spring). The major issue is in finding flat, suitable ground for a tent; the most interesting areas of the park are often the most rocky, are lacking for flat surfaces, or you would find yourself in a sandy wash/arroyo. Or, you'd be out in the open subject to horrible winds that would keep you up all night from the noise. One of the most common/easiest places to do it is on a hike to Telescope Peak, hike in a few miles, camp the night, then hike to the top and back out the following day.