Vent Geyser, Geothermal vent in Upper Geyser Basin, US

Vent Geyser is a geyser in the Grand Group of the Upper Geyser Basin, Yellowstone National Park. It erupts immediately after Grand Geyser and continues intermittently for about an hour alongside Turban Geyser. Its fountain starts at 75 feet (23 m) and then subsides to 20 to 40 feet (6–12 m).

Vent Geyser belongs to the Grand Group of the Upper Geyser Basin, and its eruptions are tied to Grand Geyser: it normally starts right after Grand and continues intermittently for about an hour alongside Turban Geyser. On rare occasions it has erupted before Grand or entirely on its own.

Vent Geyser erupts right after Grand Geyser and keeps pulsing alongside Turban Geyser for about an hour, so watchers at the Grand Group often see the two jets together. Occasionally it erupts before Grand or entirely on its own, and its steam can be hidden inside Grand's spray.

Visitors can observe the geyser's activity from designated boardwalks while maintaining a safe distance from water that reaches about 78°C (172°F). The site remains accessible year-round, though conditions vary with the seasons.

Vent Geyser usually erupts right after Grand Geyser and keeps bursting intermittently for about an hour alongside Turban Geyser. On rare occasions it has erupted before Grand or entirely on its own. Its steam can be hidden inside Grand's spray, so watchers sometimes miss it.