Old Faithful geyser erupting in Yellowstone National Park

Old Faithful in Yellowstone National Park

Yellowstone has many thermal features, but none as consistent in height, interval and length of eruption as Old Faithful; the world's most famous geyser.

Nearly every 91 minutes, Old Faithful Geyser erupts - shooting 3,700 to 8,400 gallons of boiling water into the air to reach an average height of about 145 feet in just 15 to 20 seconds. Eruptions typically last for 1.5 to 5 minutes, with a few puffs of steam signaling the end of an eruption. Park Rangers can predict Old Faithful's eruptions with an extremely high level of accuracy. This makes Old Faithful geyser one of the most convenient thermal features to see in Yellowstone National Park, as you can just about set your watch by it!

To view one of the 18 to 21 shows Old Faithful puts on each day, many visitors opt to watch from benches located about 300 feet away from the geyser's spout. Other visitors enjoy watching the eruption from a higher vantage point after a hike up to Observation Point. From here, visitors can take in the geyser from 250 feet above - providing visitors with a new perspective of this Yellowstone icon.

Available Now: Visit Google Play or the Apple App Store and download the NPS Geysers App! Get eruption prediction times for Old Faithful Geyser, Great Fountain Geyser, Riverside Geyser, Castle Geyser, Daisy Geyser, and Grand Geyser, so you can be there when the action is happening!