Hosmer Grove campground is located just within Haleakala National Park, the first left turn after the pay station. The campground sports several charcoal grills, a picnic space, bathrooms, water bottle filling station, parking lot with ample space, and a large open space that fits upwards of 10 sports for tents. The campground was easy to access and use as it was the first place we stayed before entering the crater on our 4-day backpacking trip.