Mt Etna in Sicily is basically erupting every year :D
It is called a active volcano. Inactive volcanoes have not erupted for more than a century.
The Newberry Volcano last erupted around 1,300 years ago, in the 8th century.
A volcano that has erupted within historic time is an Active Volcano.
A volcano which has not erupted in the last 2000 years.
The last in volcano that erupted in California was in 2004.
It is called active.
Deception Island, in the Antarctic, is both an island and a volcano. It last erupted in 1987. Dona Juana, in Colombia, last erupted in 1907. Dempo is a volcano in Indonesia which last erupted in 1994. Didicas volcano in the Philippines last erupted in 1978.
Koro Volcano is dormant. It hasn't erupted in the last 10,000 years or so.
That volcano is likely to erupt again. Every volcano is different ,research on the volcano and when was the last time it erupted and then add 500 to 1000 years.
Mount Redoubt which became active in 2009 last erupted in 1990.
Mt Warning is a shield volcano in Australia's Tweed Valley. The last time Mt Warning erupted was over 20 million years ago.
the Eyjafjallajokull volcano, in iceland