Overview
The Sky Lakes South Trail in Winema National Forest provides the quieter eastern approach to the southern Sky Lakes Wilderness, reaching the Fourmile Lake area and the PCT corridor through mountain hemlock forest on the Klamath Basin side of the Cascade crest. The Klamath approach is less well-known than the western Rogue River side approaches, which keeps visitor numbers lower and creates more opportunity for the solitude that makes wilderness hiking rewarding.
Fourmile Lake, the primary destination from this approach, is one of the larger lakes in the Sky Lakes system, with good fishing and open-water views that contrast with the smaller, more intimate lake basins deeper in the wilderness. The PCT junction provides directional confidence and links this route to the broader network of Cascade trails.
The Route
The trail begins at the Sevenmile Trailhead and climbs through mountain hemlock and lodgepole pine forest on the eastern slope of the Cascade divide. The gradient is consistent through the lower forest section before easing as the trail approaches the lake basin. Fourmile Lake is the primary destination, with the PCT junction visible on the western shore.
What to Expect
The Klamath side of the Cascades receives less precipitation than the Rogue River side, making the forest somewhat drier. This also means the approach road is more reliable and accessible for standard vehicles. The wilderness self-registration kiosk at the trailhead allows overnight trips without advance planning. Mosquitoes are active through August near the lakes.
Nearby
The Sky Lakes Wilderness Trail approaches from the western Cold Springs Trailhead and accesses the central lake basin. The Pelican Butte Trail provides summit views over the entire Sky Lakes basin. Klamath Falls is 25 miles southeast with full services.
Leave No Trace
This trail receives enough use that following Leave No Trace principles is important for preserving the experience for future visitors. Stay on the marked trail to prevent erosion. Pack out all waste. Avoid camping within 200 feet of water sources or the trail. Use existing fire rings only where campfires are permitted, and check current fire restrictions at checking conditions before you go before any visit. The trail and surrounding terrain remain in good condition because previous visitors have respected these norms.
Safety Considerations
The moderate rating reflects the trail's general character under typical conditions. Weather, seasonal snow, and trail conditions can change the experience significantly. Carry the 10 Essentials on any full-day outing. Inform someone of your plans and expected return time before heading out, particularly on longer or more remote trails. Cell service varies throughout Winema National Forest and may be unreliable in canyon bottoms or remote terrain.