Glacier Peak

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 48.112°N
  • 121.113°W

  • 3213 m
    10539 ft

  • 321020
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Glacier Peak.

The Global Volcanism Program has no Weekly Reports available for Glacier Peak.

The Global Volcanism Program has no Bulletin Reports available for Glacier Peak.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1700 ± 100 years Unknown Confirmed 2 Tephrochronology
[ 1300 ± 300 years ] [ Unknown ] Uncertain    
0900 ± 50 years Unknown Confirmed 3 Radiocarbon (uncorrected)
0200 ± 50 years Unknown Confirmed 4 Radiocarbon (uncorrected)
0850 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
3150 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
3550 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
[ 9675 BCE ± 375 years ] [ Unknown ] Discredited    

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


The least known of Washington's large stratovolcanoes, Glacier Peak resembles Mount St. Helens in its production of large explosive eruptions that have spread major tephra deposits over wide distances. Its eruptions were accompanied by lava dome growth and pyroclastic flows and lahars that traveled into lowland areas far from the volcano. Frequently active during the past 5500 years, Glacier Peak, seen here from the SW, last erupted only a few centuries ago.

Photo by Lee Siebert, 1990 (Smithsonian Institution).
See title for photo information.
Glacier Peak volcano, seen here at the upper right from Forbidden Peak, with Dome Peak at the upper left, rises above some of the most rugged terrain of the North Cascade mountain range. The least known of Washington's large stratovolcanoes, Glacier Peak's profile is less prominent from the Puget Sound area than its neighbors Mount Baker and Mount Rainier.

Photo by Lee Siebert, 1971 (Smithsonian Institution).
See title for photo information.
The isolated Glacier Peak volcano, seen here from the summit of Mt. Pugh on the west, is the centerpiece of the Glacier Peak Wilderness Area. Glacier Peak has produced voluminous eruptions that deposited thick units of pyroclastic-flow and lahar deposits that blocked drainages, diverting the courses of the Suiattle and Swauk rivers northward into the Skagit River valley.

Photo by Lee Siebert, 1972 (Smithsonian Institution).
See title for photo information.
Glacier Peak, the most isolated of the Cascade volcanoes, rises to 3213 m above the forested slopes of the Suiattle River valley in this east side view from Buck Creek Pass. Glacier Peak volcano resembles Mount St. Helens in its production of frequent powerful explosive eruptions that deposited ash and pumice over wide areas and produced pyroclastic flows and lahars that traveled long distances from the volcano. Its latest eruption occurred only a few hundred years ago.

Photo by Lee Siebert, 1985 (Smithsonian Institution).
See title for photo information.
Glacier Peak, seen here from Buck Creek Pass on the west, rises 3000 m above surrounding valleys, but the volcano is constructed on a high ridge and the volcano itself is only about 500-1000 m high. The eroded scarps at the base of the volcano at the head of the Suiattle River are cut in thick pyroclastic-flow and lahar deposits from recent eruptions of Glacier Peak.

Photo by Lee Siebert, 1985 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Glacier Peak in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites