Klyuchevskaya Sopka has erupted 110 times during the
Holocene Epoch. A weak thermal eruption occurred on 29 November, then stopped again which can be attributable to the larger eruption occurring at neighbouring volcano
Tolbachik due to their shared magma chamber. All of its neighboring volcanoes
Bezymianny,
Karymsky,
Kizimen,
Shiveluch, and in particular
Tolbachik erupted more actively and continuously, taking a major magma supply load off of Klyuchevskaya Sopka.
January 2013: On 25 January, the volcano had a weak
Strombolian eruption that stopped the following day. During January, all volcanoes in the eastern part of Kamchatka—Bezymianny, Karymsky, Kizimen, Klyuchevskaya Sopka, Shiveluch, and Tolbachik—erupted, with the exception of
Kamen.
August 2013: On 15 August, the volcano had another weak Strombolian eruption with some slight lava flow that put on an excellent fireworks display before stopping on 21 August 2013, when
Gorely Volcano woke up and started erupting again in relief of Klyuchevskaya Sopka. image of the October 17, 2013, eruption
October 2013: On 12 October, Klyuchevskaya Sopka had another three days of on-and-off eruptions with anomalies and a short ash plume, possibly indicating Strombolian and weak Vulcanian activity. An explosion from a new cinder cone low on Kliuchevskoi's southwest flank occurred on 12 October. An ash plume rose to altitudes of , and drifted eastward. The eruptions weakened and paused by 16 October 2013.
November/December 2013: On 19 November, a strong explosion occurred, and observers reported that ash plumes rose to altitudes of and drifted southeast. The Aviation Color Code was raised to Red. Later that day, the altitudes of the ash plumes were lower and the eruptions weakened and stopped again. On 7 December, activity at Kliuchevskoi significantly increased, having continued during 29 November – 7 December, prompting
KVERT to raise the Alert Level to Red. Ash plumes rose to altitudes of above
sea level and drifted more than northeast and over east. According to a news article, a warning to aircraft was issued for the area around the volcanoes. Video showed gas-and-steam activity, and satellite images detected a daily weak thermal anomaly. On 9 December, the Alert Level was lowered to Green when the eruptions abruptly stopped.
2015: On 2 January, after a one-year period of inactivity, the volcano had a Strombolian eruption which stopped on 16 January. Minor eruptions resumed on 10 March and stopped on 24 March. On 27 August, the volcano had another Strombolian eruption which ended 16 hours later.
2019: Kluchevskaya Sopka saw renewed eruptive activity beginning in 2019. On 25 October, the volcano had another weak Strombolian eruption which ended some 30 hours later.
Eruptions in the 2020s 2020: The volcano erupted on 9 December.
2022: An eruption started on 20 November.
2023: An eruption started on 22 June. The June eruption follows nearby eruptions on 11 April in other volcanoes in the area. A significant eruptive event occurred as part of ongoing activity on 1 November, sending ash as high as above sea level and causing flight delays as far away as
Vancouver, Canada, on 4–5 November.
2025: An eruption occurred on 30 July, shortly after
a large earthquake in Kamchatka. The eruption was not directly caused by the earthquake; activity at the volcano had been observed over the preceding days. ==2022 climbing accidents==