The Upper Geyser Basin in Yellowstone National Park is a geothermal wonderland packed with over 150 active geysers, including the famous Old Faithful. There are well-maintained boardwalks and trails throughout the area, so if you're waiting for Old Faithful to erupt, check out the geysers below. For real-time predictions of some of these geysers, you can check in the Old Faithful Visitor Education Center.

• Grand Geyser: Often cited as a must-see, and if you can only catch one besides Old Faithful, many recommend Grand. It's the tallest predictable geyser in the world, erupting to heights of 150-200 feet. Eruptions typically last 9-12 minutes, with intervals that can range from 6 to 15 hours (averaging around 7-8 hours recently). It often has multiple bursts within an eruption.  

• Castle Geyser: Notable for its large, castle-like cone and powerful eruptions reaching around 75 feet, lasting for a significant 15-20 minutes. It also has a noisy steam phase after the water eruption. Intervals average around 10-12 hours.  

• Daisy Geyser: Known for its predictability (after Old Faithful) and unique angled eruptions reaching about 75 feet. Its average interval is around 2 hours, but wind can affect the timing.  

• Riverside Geyser: Beautifully situated on the bank of the Firehole River, it erupts at an angle into the river, often creating rainbows. Eruptions last about 20 minutes with intervals around 6.5 hours.  

• Beehive Geyser: While its eruptions can be less predictable, when it goes off, it's spectacular, shooting water over 150 feet high for about 5 minutes. There's often a smaller "indicator" geyser nearby that can give clues to an impending Beehive eruption.  

• Anemone Geyser: This is actually a set of two closely related geysers: Big Anemone and Little Anemone. They were named for their pale yellow, flower-like shapes. They are located on Geyser Hill and are relatively frequent and easy to observe.

  • Big Anemone: Erupts more vigorously, reaching heights of 6-8 feet (1.8-2.4 meters) with eruptions lasting 25-45 seconds every 6-10 minutes on average. You can often hear water rising in the crater before it erupts, and it drains back into the vent with a gurgling sound after eruption.

  • Little Anemone: Has less powerful but longer-lasting eruptions, reaching up to 4 feet (1.2 meters) and lasting anywhere from under a minute to over 30 minutes, with intervals varying from 6 to 35 minutes. Sometimes it fills and drains without a significant eruption.