1860 BC Eruption of St. Helens

Name: 1860 BC Eruption of St. Helens
Location: St. Helens, United States

1860 BC · VEI 6

St. Helens in the United States erupted in 1860 BC with a Volcanic Explosivity Index of 6.

Where it erupted

St. Helens, United States, with its other significant eruptions.

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The eruption

Date: 1860 BC
Volcano: St. Helens, stratovolcano
Country: United States
Volcanic Explosivity Index: 6, paroxysmal (eruption column over 25 km)
Location: 46.200° N, 122.180° W

The toll

The record gives no deaths, injuries or damage for this eruption.

What the record says

NCEI’s account, from the sources it cites.

Major explosive eruption around 1860 BC.

Other significant eruptions of St. Helens

Every eruption in 1860 BC The 1800s BC St. Helens Earthquakes near St. Helens

Sources

Volcanoes and significant eruptions from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. Volcano numbers are the Smithsonian Institution’s Global Volcanism Program’s. NCEI event 5233.