Mystery Campground sits near Twisp in a remote area where cell service is often limited or nonexistent. The campground operates on a first-come, first-served basis. You can pay on-site by scanning a QR code through the Recreation.gov mobile app, so download it before you arrive.
Weather and SeasonsBest season: fall. Fall offers the most comfortable combination of mild daytime temperatures (typically 45–70°F / 7–21°C in September–October), crisp nights, and dramatic color changes in riparian trees and higher-elevation aspens — great for hiking and photography. Crowds thin after Labor Day compared with peak summer, so first-come, first-served camping is easier, and trail access is still good before heavy winter snow; be aware of weekend hunters in peak hunting periods and wear blaze orange if you plan to hike
Peak months: September, October, August, May