The Devils Postpile Ranger Station is open daily from 9 am - 5 pm during the operating season which is typically mid-June to mid-October. Rangers can help you plan your adventure at Devils Postpile. The ranger station is listed on the National Register of Historic Places for its association with changes in national park planning and development from the late 1930s to the start of World War II in 1941. The simple two-room cabin was constructed in 1941 from lumber salvaged from the demolished Sentinel Hotel.