Onion Valley Campground is located in the Inyo National Forest of California, near the eastern Sierra Nevada mountains. It sits at an elevation of about 9,200 feet, offering stunning views and access to various hiking trails, including the popular Kearsarge Pass trail. The campground features 32 campsites, each equipped with picnic tables and fire rings. The campground is typically open from late May to early October, depending on weather conditions. Facilities include restrooms and potable water, but there are no showers. Visitors can enjoy activities such as hiking, fishing, and wildlife viewing in this scenic area.