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Mount Whitney Trail
Extremely StrenuousSAC: T2Out & Back

Mount Whitney Trail

Inyo National Forest / Sequoia National Park • Lone Pine, California

Distance21.8 mi(35.1 km)
Elevation Gain+6,646 ft(+2026 m)
High Point14,505 ft(4421 m)
Est. Duration12 - 16 hoursTypical pace
Quick Answer & Key Takeaways

Mount Whitney Trail in Inyo National Forest / Sequoia National Park is a 21.8-mile out & back trail with +6,646 feet of elevation gain, rated as Extremely Strenuous (SAC T2). Best hiked between July, August, September, Early October, the route requires approximately 12 - 16 hours and requires an official permit (Inyo National Forest recreation.gov lottery permit mandatory for both day hikers and overnight backpackers.).

Difficulty: Extremely Strenuous • Elevation gain: +6,646 ft
Water availability: Lone Pine Creek, Outpost Camp, Mirror Lake, and Trail Camp (filtration mandatory). No water above Trail Camp.
Primary hazards: Acute Mountain Sickness (AMS) / High Altitude Illness, Hypothermia from rapid temperature drops, Exhaustion over 22 miles and 6,600+ ft gain, 99 Switchbacks iced sections
Permit requirement: Inyo National Forest recreation.gov lottery permit mandatory for both day hikers and overnight backpackers.

Trail Overview

Beginning at Whitney Portal (8,360 ft), this non-technical highway to the clouds traverses Jeffrey pine forests, cascading streams, and alpine meadows at Outpost Camp and Mirror Lake. Above Trailside Meadow, vegetation ceases as you reach Trail Camp (12,000 ft), a windswept alpine rock shelf beneath the sheer granite needles. Here begins the infamous 99 switchbacks, zig-zagging up the headwall to Trail Crest (13,645 ft). The final two miles track behind Mount Muir and the Needles along a dramatic granite ledge with breathtaking windows overlooking Sequoia National Park, ending at the historic 1909 Smithsonian stone shelter on the 14,505-foot summit.

Key Route Highlights

  • Contiguous USA's highest point (14,505 ft)
  • The formidable 99 Switchbacks
  • Trail Crest ridge panoramic vista
  • Historic 1909 Smithsonian summit shelter
Critical Hazards & Risk Factors
Acute Mountain Sickness (AMS) / High Altitude Illness
Hypothermia from rapid temperature drops
Exhaustion over 22 miles and 6,600+ ft gain
99 Switchbacks iced sections
Ranger Safety Recommendations:
  • Acclimatize in Mammoth Lakes or Horseshoe Meadow for 1–2 days prior to ascending to avoid altitude sickness.
  • Carry 3–4 liters leaving Trail Camp; there is zero surface water for the top 5 miles round-trip.
  • Bring thermal layers, windproof shell, warm gloves, and a beanie; summit temperatures can drop below freezing even in July.
  • Set an absolute turnaround time (e.g., 1:00 PM) regardless of whether you have reached the peak.
Field Preparation Tool

Calculate Your Time on Mount Whitney Trail

Customize with your specific pack weight and rest intervals using Naismith's formula.

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Logistics & Regulations

Permits & Reservations

Inyo National Forest recreation.gov lottery permit mandatory for both day hikers and overnight backpackers.

Optimal Season

July, August, September, Early October

Water Availability

Lone Pine Creek, Outpost Camp, Mirror Lake, and Trail Camp (filtration mandatory). No water above Trail Camp.

Pet / Dog Regulation

Not Allowed

Crowd Density

Moderate Traffic

GPS Coordinates
36.5785, -118.2923Map →
CavingClub.org Field Safety BulletinAlways carry the Ten Essentials, 3 lights for caves, and decontaminate gear for bat protection.
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