Place · 2 mi away
Overview
A true Sierra classic, this out-and-back climbs from Onion Valley over Kearsarge Pass and drops into the Kearsarge Lakes basin inside Kings Canyon. It’s about 12.4 miles total round-trip with roughly 3,490 feet of gain—plan on 7+ hours moving time if you’re fit and acclimated. Expect huge granite, a string of alpine lakes, and wide-open views that make the grind worth it.
Route and Scenery
From the Onion Valley Trailhead (~9,100 feet), steady switchbacks rise past Little Pothole Lake, Gilbert Lake, Flower Lake, and Heart Lake. Shade is scarce and the trail gets rockier as you climb. Crest Kearsarge Pass around 11,700 feet for a panorama of the Kearsarge Pinnacles and the basins beyond, then descend into Kings Canyon National Park to reach the Kearsarge Lakes. A short spur toward Bullfrog Lake is a popular add for views (no camping there).
Difficulty and Who It’s For
The numbers don’t tell the whole story: altitude and a continual climb make this feel tougher than the mileage suggests—especially with a backpack. Day hikers often turn around at the pass; backpackers press on to the lakes. The trail is well-marked with no river crossings, but exposure and elevation demand pacing, hydration, and sun protection.
Permits and Regulations
Overnight trips require a wilderness permit for the Onion Valley entry, issued by Inyo National Forest. Rangers check frequently. Bear canisters are mandatory for all food and scented items. Camp at least 100 feet from water and use established sites; there’s a two-night maximum at Kearsarge Lakes. Campfires are generally not allowed above 10,000 feet. Dogs are allowed up to Kearsarge Pass on the Inyo side but are not permitted inside Kings Canyon beyond the pass.
Camping and Water
Water is plentiful en route, but access varies. Flower Lake is a reliable, convenient refill; Heart Lake and Big Pothole Lake are less practical for drawing water. Treat everything. At the lakes, expect established sites set back from shore; follow Leave No Trace and the two-night limit.
Seasons, Conditions, and Tips
Summer and early fall are prime. Shoulder seasons can bring lingering snow and ice—traction like microspikes or crampons may be necessary in winter conditions. Start early to beat heat and afternoon storm build-up, and to find parking. Bring electrolytes, sun layers, and bug repellent for the warm months. Photographers: morning and evening light at the lakes and pass can be fantastic under clear skies.
Pros
- Reliable water sources en route, with a prime refill at Flower Lake
- No river crossings simplifies early or high-flow seasons
Cons
- Little shade; the exposed climb can be punishing on hot days
- Dogs are allowed only to the pass, then banned—awkward for pet trips
Parking
Large lot at Onion Valley Trailhead at the end of Onion Valley Road; arrive early on weekends and holidays.
Caution
High altitude, sustained climb, and strong sun exposure; winter conditions may require traction. Strict regulations (permit checks, food storage, no fires above 10,000 ft) and no dogs beyond Kearsarge Pass.
