Lillian Lake Trail

Lillian Lake Trail is a long-distance hiking route in Sierra National Forest through the Ansel Adams Wilderness, commonly done as a loop around Lillian Lake and nearby lake basins. Typical descriptions put the route at about a 12-mile loop, with an “out-and-back” option also used when you don’t complete the full loop.

Most hiking plans start from the Fernandez Trailhead (5S05) and head into high country. A common clockwise loop passes Vanderburgh Lake early and continues toward Lady Lake and Lillian Lake. The route also crosses areas of mixed forest and meadows as it works up into the alpine lake basins.

The hike reaches higher elevations and is generally described as challenging-to-moderate, with big elevation gain for a ~12-mile outing (roughly 1,700–2,200+ feet reported, and a high point around 9,200 feet). Expect sustained climbing plus frequent ups-and-downs between lake basins rather than a single steady grade the whole way.

Lake basins encountered along the route include Vanderburgh, Lady, and Lillian Lakes, with additional opportunities for short side trips from the Lillian Lake area. When you’re planning your day, treat the lake crossings and basin-to-basin navigation as part of the effort, not just the tread time.

Seasonality matters here: July through October are described as the best time to hike. Early season can mean mosquitoes and lingering snow patches, which can also affect footing near creeks and shaded benches.

Overnight use requires a wilderness permit for camping, and the route is in Ansel Adams Wilderness where permit rules apply. If you plan to camp, also assume campground/fire limitations within the wilderness around popular lakes and outlets; plan to camp only where allowed for your specific lake or zone.

Water availability varies by time of year; some years late-season conditions can leave creek crossings much easier than mid-July reports where at least one major creek crossing was deep. With that variability, bring enough water capacity for your expected conditions and be ready for wet feet during early-to-mid season.

High-value prep: scout or inspect committed trail features before you go deep into the route, and treat wet weather as a potential sensitivity point for crossings and muddy stretches. In particular, don’t rely on “it was fine last time” assumptions—if the route is wet or snowmelt is running, crossing depth and footing can change fast.

More information: Sierra National Forest - Hiking in California, Lillian Lake Loop - Hiking in California, Lillian Lake Trail via Fernandez Trailhead | High Sierra