Big Cub Geyser, Geyser in Upper Geyser Basin of Yellowstone National Park, United States.

Big Cub Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park. It belongs to the Lion Group and has water that reaches about 92 degrees Celsius (199 degrees Fahrenheit).

The Lion Group received its name from park researchers who documented the sounds produced during eruptions. This naming system still helps distinguish the different geysers in this area today.

Big Cub belongs to the Lion Group, whose members share an underground connection: Lion Geyser, Lioness Geyser and Little Cub Geyser. Because of this link, activity at one vent can affect the others. Big Cub itself almost never erupts; its last known eruption was in 1998, and decades can pass between eruptions. When it does erupt, the cone-type geyser throws water about 15 metres high for roughly four minutes. Occasionally it and Lioness Geyser splash water without producing an eruption.

Big Cub Geyser sits in the Lion Group, reached on foot from the boardwalks of the Upper Geyser Basin near Old Faithful. Because eruptions are rare and unpredictable, check current activity before waiting at the cone. Stay on the marked path and keep a safe distance from the vent.

Big Cub Geyser almost never erupts: its last known eruption was in 1998, and intervals of decades between eruptions are not rare. When it does erupt, it reaches about 15 metres for roughly four minutes. It sometimes splashes water together with Lioness Geyser, though this rarely leads to an eruption.