The Lost Valley Camp camping area in California offers stunning views of the surrounding mountains and forests. Located near the San Gabriel Mountains National Monument, it provides easy access to hiking trails and outdoor activities, as well as nearby points of interest such as the Mount Baldy Ski Lifts and the city of Claremont. The campground offers amenities such as picnic tables, fire pits, and vault toilets. It operates on a first-come-first-serve basis, with 42 campsites available. The best time to visit is during the summer months when temperatures range from 60-80°F. It's important to note that the campground is closed during the winter months due to snow and ice.