The last volcanic eruption in Alaska was from Atka volcano in 2024.

The first historically documented eruption occurred 1700 from Amak volcano.

Volcanoes in Alaska erupt almost every year. Since the first historically documented eruption 1700in Alaska, historic sources have shown nearly continuous volcanic activity: The Global Volcanism Project counts 333 historic eruptions until now, spanning a total of 209 out of 325 years. In other words, a volcano in Alaska is active roughly every one in 1.6 years on average. This value is likely underestimated, because the record of historically documented activity is likely inclomplete the further back in time we look.

Alaska is volcanically extremely active: Since 1900, at least 32 volcanoes in Alaska have been active. Almost every year, at least one volcano has erupted in Alaska. The last volcano to erupt in Alaska was Atka volcano, which erupted in 2024, 16 months ago.

The largest eruption in Alaska in historic times was from Novarupta volcano. It occurred in 1912. It ranks as a plinian eruption with a magnitude 6 on the VEI (Volcanic Explosivity Index) scale. Eruption of this size are often catastrophic on a regional scale.