Iztaccíhuatl (pronounced ees-tah-see-watl), often affectionately called “Izta,” is the third-highest mountain in Mexico, rising to 5,230 meters (17,160 ft). Its name comes from the Nahuatl language, meaning “White Woman” (iztac = white, cihuatl = woman). While its neighbor, the fiery Popocatépetl, smokes and rumbles just to the south, Iztaccíhuatl sleeps in frozen silence.

If you look at the mountain from the west (Mexico City) or the east (Puebla), the outline is unmistakable: it forms the silhouette of a sleeping woman lying on her back. Depending on the angle, you can clearly distinguish her head (La Cabeza), chest (El Pecho), knees (Las Rodillas), and feet (Los Pies). This unique geography has woven the mountain deeply into the cultural fabric of Mexico.

The Tragic Legend of Popo and Izta

You cannot speak of Iztaccíhuatl without telling the most famous love story in Mexican folklore—the Aztec “Romeo and Juliet.”

Legend has it that Iztaccíhuatl was a beautiful princess, the daughter of a mighty Aztec emperor. She fell in love with Popocatépetl, a brave and handsome warrior. The emperor agreed to their marriage, but only if Popocatépetl returned victorious from a war against their enemies (often cited as the Tlaxcaltecs).

While Popocatépetl was away fighting, a jealous rival told the princess that her beloved had died in battle. Crushed by grief, Iztaccíhuatl cried until her heart stopped, and she died. When Popocatépetl returned in triumph, he found his love dead.

To honor her, he ordered a great tomb to be built under the sun. He carried her body to the top of a mountain range and laid her down. The gods, moved by their tragic love, turned humans into mountains. Iztaccíhuatl became the “Sleeping Woman,” covered in eternal snow. Popocatépetl became the smoking volcano, standing guard over her with a torch that never goes out (the fumaroles), eternally watching over his sleeping lover.

Geography and Glaciers

Geologically, Iztaccíhuatl is a massive volcanic complex composed of several overlapping cones that have grown over nearly a million years. Unlike the conical Popocatépetl, Izta is elongated and massive, with a volume of about 450 cubic kilometers.

The Disappearing Ice

Iztaccíhuatl is one of the distinct peaks in Mexico that still supports glaciers, along with Pico de Orizaba and (rarely now) Popocatépetl. However, these are tropical glaciers, and they are dying.

The Glaciar de Ayoloco: Once a prominent ice field on the mountain’s belly, it was declared extinct in 2021. A plaque was placed there stating: “Here existed the Ayoloco Glacier… A shame to give you this message, but it is for you to know what happened here.”
Current State: Only a few patches of permanent ice remain near the summit and on the northern slopes. Scientists predict that within a decade or two, the “White Woman” may lose her white shroud forever due to climate change.

Mountaineering: Climbing the Sleeping Woman

For mountaineers, Iztaccíhuatl is the premier training ground in Mexico. It offers a true high-altitude experience without the technical difficulty of technical rock climbing or the volatility of an active eruption. However, it is not a hike; it is a serious mountaineering endeavor.

The Route: La Arista del Sol (The Ridge of the Sun)

The standard route (“La Arista del Sol”) is a long, physically demanding trek that traverses the “body” of the sleeping woman.

La Joya (3,900 m): The trailhead. A parking area accessible by car. Climbers start here, passing through high-altitude pine forests and grassy slopes (zacatonal).
Primer Portillo & Segundo Portillo: These arête crossings offer the first stunning views of Popocatépetl smoking in the distance. The wind here can be ferocious.
Refugio de los Cien (4,720 m): A tin hut (often in disrepair) located in the “knees” section or just below. It serves as an emergency shelter but is not a comfortable place to sleep.
Las Rodillas (The Knees - 5,050 m): A steep scramble leads to the top of the knees. Here, you encounter the remains of the glaciers. The air is thin (50% of widely available oxygen).
La Arista: A long, undulating traverse across the belly. This is mentally the hardest part—you can see the summit (The Breasts) far away, and there are several false summits.
El Pecho (The Summit - 5,230 m): The highest point. The view is unparalleled. To the south, Popocatépetl dominates the sky. On a clear day, you can see Pico de Orizaba (Citlaltépetl) to the east and the sprawl of Mexico City to the west.

Challenges

Altitude Sickness: This is the #1 killer of summit attempts. Climbers must acclimatize. Spending a night at Paso de Cortés or Altzomoni Lodge (4,000 m) is highly recommended.
Weather: Storms can roll in quickly from the Gulf of Mexico. Whiteouts are common on the glacier usage, and lightning is a deadly hazard on the exposed ridges.
Length: It is a very long day. A typical summit push starts at 2:00 AM and takes 10-14 hours round trip.

Practical Information

Location: Izta-Popo Zoquiapan National Park, about 70 km southeast of Mexico City.
Permits: You must register at the park office in Amecameca or at the Paso de Cortés visitor center. A small fee is required.
Best Season: The dry season runs from November to March. This offers the clearest views and most stable weather, though it is also the coldest. May to October is the rainy season, bringing snow at high altitudes but generally poor visibility.
Safety: While Iztaccíhuatl is considered “dormant,” its neighbor Popocatépetl is violently active. The pass between the two (Paso de Cortés) is safe, but climbing Popo is strictly forbidden. Always check the volcanic alert status (Semáforo de Alerta Volcánica) before heading to the park.
Altitude Profile: The climbing route passes through several ecological zones — from pine forests at 3,500m through alpine meadows to permanent snow and ice above 4,800m. Carrying crampons and an ice axe is essential for the upper sections, even in dry season.
Nearby Amenities: The town of Amecameca (2,500m) serves as the standard base for climbers. It offers basic hotels, restaurants, and gear shops. From here, the Paso de Cortés is a 30-minute drive, and the La Joya trailhead is about an hour further.