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13,246 ft · San Juan Mountains, Colorado

Fortress Peak

Fortress Peak is a 13,246 ft peak in the San Juan Mountains, Colorado. The standard route is the Fortress West Ridge: 5 mi, 2,500 ft of gain, Class 3.

Plan this climbView Colorado 13ers
Fortress Peak in the San Juan Mountains, Colorado

Fortress Peak at a glance

  • Elevation13,246 ft4,037 m
  • RouteFortress West RidgeClass 3
  • Distance5 mi2,500 ft gain
  • Time5 – 7 hrsHard effort
  • SeasonJul – Sep
  • RangeSan Juan MountainsColorado

Climbing the Fortress West Ridge

Fortress Peak sits in the San Juan Mountains. The usual ascent is Fortress West Ridge, rated Class 3. Plan about 5 miles round-trip with roughly 2,500 ft of gain from about 10,750 ft. Expect a rough 4WD approach road. Summer monsoon storms build fast, so start early and be off the summit by early afternoon. Watch for loose rock, route-finding on talus, and brief exposed steps where the terrain steepens. Stats and approach details follow climb13ers.com. A helmet is wise on loose Class 3 sections.

Gear and hazards

What to bring

  • Backpack (25–35 L)
  • Hiking Boots
  • Water
  • Offline Maps
  • Headlamp
  • Satellite Communicator
  • Whistle
  • Sunglasses
  • Sunscreen
  • Sun Hat
  • Midlayer
  • Insulated Jacket
  • Hardshell Jacket
  • Warm Hat
  • Buff
  • Midweight Gloves
  • Trekking Poles
  • GPS Device
  • Power Bank
  • Water Filter
  • First-Aid Kit
  • Emergency Bivy
  • Helmet

What to watch for

  • Storms
  • High altitude
  • Loose rock
  • Steep exposure
  • Route-finding difficulty

Quests with Fortress Peak

Peaks near Fortress Peak

  1. Redcliff

    Redcliff

    13,648 ft · 0.7 mi away

  2. Coxcomb Peak

    Coxcomb Peak

    13,663 ft · 1.2 mi away

  3. Precipice Peak

    Precipice Peak

    13,141 ft · 1.6 mi away

  4. UN 13215

    UN 13215

    13,215 ft · 1.7 mi away

Frequently asked questions

How tall is Fortress Peak?

Fortress Peak is 13,246 feet (4,037 m) tall. It is in the San Juan Mountains, Colorado. It is also known as Fortress Peak.

How does Fortress Peak rank among the Colorado 13ers?

At 13,246 feet, Fortress Peak is the 390th highest of the 582 Colorado 13ers. The highest is Grizzly Peak.

How hard is it to climb Fortress Peak?

The Fortress West Ridge is Class 3, which means scrambling, where you use your hands to climb and a fall could be serious. Yak rates the overall effort hard: 5 miles with 2,500 feet of elevation gain.

How long does it take to climb Fortress Peak?

Most people take 5 – 7 hours round trip on the Fortress West Ridge, covering 5 miles with 2,500 feet of elevation gain, so most people do it in a day.

Is Fortress Peak dangerous to climb?

It has real risks: exposed sections where a fall would be serious, rockfall from loose rock and fast-changing weather. Go with an experienced partner, wear a helmet, test holds before you trust them and turn back if the rock is wet or icy.

Do you need a helmet for Fortress Peak?

It is a good idea. Loose rock and rockfall are common on the Fortress West Ridge, so a helmet is on the gear list.

Will you get altitude sickness on Fortress Peak?

You might. Most people feel the altitude above 8,000 feet, and Fortress Peak reaches 13,246 feet. Spend a night or two at elevation first, drink plenty of water and turn back if a headache, nausea or dizziness gets worse.

What time should you start climbing Fortress Peak?

Early. Afternoon thunderstorms are common in summer, so aim to be off the summit and the exposed upper mountain by early afternoon.

When is the best time to climb Fortress Peak?

The usual climbing window is July to September. Outside it, expect snow, storms or closed access, and check the summit forecast before you go.

Climb Fortress Peak with Yak

Plan your route on a topo map, check the summit forecast, then log your climb and see what is left on your list

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