Peterson Butte is a USHPA regulated site that requires a USHPA membership card to be carried on site. It is open only part of the year, Nov. 1 to May 31, and is on private land. Hang glider pilots use the site as well as radio controlled glider clubs.
Chehalem is also on private land, and so you must check with a local pilot before flying here to learn the landing zones and launch areas. Each has their own problems.