CLOSED ALL YEAR 2025 Lost Creek Campground is managed by the National Park Service. It usually opens in early July and closes in mid-October, depending on weather and other factors. It is for tent campers only--NO RVs, buses, trailers, or vans and truck with toilets. Registration is self-serve on the day of arrival. No advance registration is available. The campground fills by mid-afternoon. The only means of knowing site availability is upon arrival at the campground. The elevation 6,000 ft. (1,829 m).