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How Often Does Old Faithful Erupt?

How Often Does Old Faithful Erupt?

Yellowstone National Park’s crowning jewel is undoubtedly the Old Faithful geyser. This awe-inspiring geological feature was christened by the 1870 Washburn Expedition and previously dubbed “Eternity’s Timepiece” due to its remarkably consistent eruptions. As a result, visitors have expressed a keen interest in discovering the frequency with which Old Faithful erupts.

Old Faithful geyser in Yellowstone National Park erupts approximately every 90 minutes, though the interval can vary from 35 to 125 minutes. The old Faithful erupts around 17 times a day, and these eruptions typically last between 1.5 to 5 minutes and can shoot water up to 185 feet in the air, depending on the eruption’s intensity.

Fortunately, the Old Faithful and Upper Geyser Basin area offers various sights and activities, so you won’t be bored waiting for an Old Faithful eruption. Please read the article to find out more about Old Faithful eruptions.

What Is Old Faithful?

Old Faithful, situated in Yellowstone National Park, is undoubtedly the most renowned geyser in the world. A geyser is a hot spring that intermittently releases boiling water, generating a towering plume of water and steam into the air. 

During the inaugural official expedition to Yellowstone, the Washburn Expedition of 1870, Old Faithful received its name due to its size and frequency, which impressed the explorers. Despite not being the park’s most powerful or regular geyser, Old Faithful is the most sizeable and predictable geyser. 

It has maintained a consistent eruption pattern throughout the park’s recorded history. 

As a result of the extensive research conducted on it over the years, it has become one of the most studied geysers. One of the benefits of this close monitoring is that Park Rangers can reasonably predict when its next eruption will occur.

Please watch this video to get a glimpse of the Old Faithful eruption:

Old Faithful Geyser – Yellowstone National Park (HD)

How High And For How Long Does Old Faithful Erupt?

The height of Old Faithful can range from 100 to 180 feet, with an average elevation of 130 to 140 feet. Its measured size has historically varied within this range. Typically, eruptions last 1.5 to 5 minutes.

People also wonder about the timing between each eruption, which various factors affect. It includes the underground water levels and pressure, making it difficult to predict the exact timing of the next eruption. 

However, the National Park Service has developed a prediction system to forecast the subsequent eruptions’ approximate time within a 10-minute window. Visitors can check the webcam page and most of the Old Faithful region building for stated prediction times.

Is Old Faithful Slowing Down?

It is common for visitors to anticipate an hourly eruption of Old Faithful, only to find themselves waiting for an extended interval of 90 minutes to two hours. Consequently, they may wrongly assume that the geyser is slowing down. However, Old Faithful’s interval range of 35-120 minutes has remained consistent throughout the years. 

While long-interval eruptions have become slightly more prevalent in recent years than they were a few decades ago, the yearly average has only increased by a few minutes. Despite this minor variation, the range of intervals remains unchanged.

However, Yellowstone National Park Tips reports that the Old Faithful geyser used to erupt 21 times daily before the 1959 earthquake. While this decline in activity would have been noteworthy to geologists closely monitoring each eruption, most visitors would still find it satisfactory to witness one or two eruptions.

How Much Water Is Released During An Eruption?

There is no specific answer to how much water is expelled during an eruption, as it depends on how long the eruption lasts. The range, according to scientists, is between 3,700 gallons (for a brief period of 1.5 minutes) to 8,400 gallons (for a longer duration of 4.5 minutes).

What Is The Best Place To Watch Old Faithful Eruption?

Yellowstone National Park offers several options for viewing the Old Faithful geyser erupt. The most popular location is the bleachers, which tend to get busy. However, you can use the gathering crowd as an “Old Faithful Indicator” to count down to the eruption. 

For a more secluded experience, you can walk to the backside of the geyser. Another excellent location is the balcony of the Old Faithful Lodge, where visitors can enjoy a drink while watching the eruption. When the weather is unfavorable, the Old Faithful Visitor Education Center is an ideal spot for viewing, thanks to the live cam and the large windows. 

Those willing to walk can take the 1.1-mile loop to Observation Point, which offers a breathtaking view of the Upper Geyser Basin from 250 feet above Old Faithful, and then continue to Solitary Geyser before returning to Old Faithful on the Upper Geyser Trail.

How Hot Is The Water In The Old Faithful Eruption?

The water in Old Faithful is boiling, with a temperature of 204°F (95.6°C) at the vent during an eruption. Additionally, the temperature of steam has been recorded to be above 350°F. It is imperative to maintain a safe distance from thermal features and avoid walking on a geyser’s delicate crust by constantly staying on the boardwalk.


Old Faithful geyser remains a fascinating and popular attraction at Yellowstone National Park. Its regular eruptions and impressive height make it a must-see for visitors worldwide. 

While securing a prime viewing spot can be challenging due to the park’s high volume of visitors, it is still possible to have a more intimate experience by avoiding peak times and visiting during the shoulder seasons or winter. Regardless of when you visit, stay a safe distance from thermal features and enjoy the awe-inspiring beauty of this natural wonder.