Mount Whitney via Mt Whitney Trail

Mount Whitney is the highest summit in the contiguous United States at 14,505 feet — and the standard route via the Mt Whitney Trail from Whitney Portal is one of the most-applied-for and most-rejected wilderness permits in the National Forest System. The Inyo National Forest Mt Whitney Zone permit lottery opens for applications February 1 each year for hikes between May 1 and November 1, draws in late February, and notifies winners in early March. Single-day permits (no overnight on the trail) draw at roughly 35 percent success in peak months; overnight permits (camping at Outpost Camp or Trail Camp) draw at 25 percent. Cancellation pickups become available on a daily-release system on recreation.gov starting two weeks before each hike date — the cancellation pool is what most spontaneous hikers actually rely on.

The trail itself starts at Whitney Portal at 8,360 ft and climbs 6,146 ft over 11 miles one-way to the summit boulder field, then descends the same route for a 22-mile round-trip total. The route's signature feature — the 99 switchbacks between Trail Camp at 12,000 ft and Trail Crest at 13,600 ft — wraps the east face of the Sierra Nevada in a half-mile of straight-up zigzag, with cable handrails installed by USFS on the steeper sections to prevent slide-falls on the ball-bearing decomposed-granite tread. From Trail Crest, the trail joins the John Muir Trail and traverses 1.9 miles north along the spine of the Sierra crest to the summit hut — passing the Mt Muir, Mt Hitchcock, and the various un-named 14,000-ft towers that define the western escarpment.

The single-day hike attempt typically takes 12-18 hours round-trip and starts at 2-4am from the trailhead to maximize daylight on the descent. Altitude is the operational hazard: starting at 8,360 ft and topping out at 14,505 ft in under 10 hours doesn't give most sea-level visitors enough time to acclimatize, and acute mountain sickness symptoms (headache, nausea, ataxia) begin at Trail Camp for unprepared hikers and become disabling at Trail Crest. The USFS-recommended pre-acclimatization protocol involves spending 2-3 nights at 8,000-10,000 ft elevations in the eastern Sierra (Lone Pine, Bishop, Mammoth Lakes) before the summit attempt — most hikers compress this into one acclimatization night at Whitney Portal Campground and accept the altitude-illness risk.

Whitney Portal Campground (44 sites, 35-ft rig cap, dry only, USFS-operated at the trailhead) reserves on recreation.gov 6 months ahead and books for peak weekends within hours of opening. The campground sits at the actual Mt Whitney Trail trailhead — no shuttle or extended drive required — which makes it the rare situation where the rig basecamp IS the staging point. Lone Pine Campground 8 miles east on the Whitney Portal Road (USFS, 30-ft cap, dry only) and Tuttle Creek Campground (USFS, 30-ft cap, dry only, on the Lone Pine side road) are the overflow rig staging when Whitney Portal fills. For full hookups, the Boulder Creek RV Resort and Diaz Lake Recreation Area in Lone Pine itself accept any rig length.

The trailhead day-use parking lot holds 60 cars with an explicit oversize section at the lower overflow lot that accommodates RVs up to 40 ft for day-use only — overnight rig parking at the trailhead is prohibited and rangers ticket aggressively, since the trailhead lot is meant for hiker turnover not basecamp staging. The Whitney Portal Store at the trailhead sells the legendary Whitney Portal Pancake (a single pancake the size of a dinner plate, $9, served until 11am only) which has become the post-summit ritual for hikers descending into civilization. The Mt Whitney summit itself sits inside Sequoia National Park's wilderness boundary, but the entire approach trail is in Inyo NF — which is why the Mt Whitney Zone permit comes from Inyo even though the actual peak is NPS land.