Unless you have a truck camper and flotation tires there is no way to get back towards Medano Pass for camping with a trailer, and that is where I assume you are asking about.
There is also a NFS campground just outside Crestone, ohterwise there is no boondocking around the park.
Rich,and Tobi (the rescued dog)
Prowler 5ver, 84 Ford F250 KCOCOLOR78 Weather
Colo. Spgs. CO
Specifically in the Sangre De Christo's in the general area of the Sand Dunes. I thought I'd read a post that mentioned some spots but my search did not yield any results.