We noticed that you're using an unsupported browser. The TripAdvisor website may not display properly.
We support the following browsers:
Windows: Internet Explorer, Mozilla Firefox, Google Chrome. Mac: Safari.

Biscuit Basin - Yellowstone National Park

Biscuit Basin is home to Sapphire Pool, Mustard Spring, Avoca Spring, Shell Geyser, Jewel Geyser, and other features.
Rating: 5 out of 5 by EveryTrail members
Difficulty: Easy
Length: 0.7 miles
Duration: Less than 1 hour
Family Friendly

Overview:  Biscuit Basin is part of Upper Geyser Basin.

The following information was taken from the Old Faithful Area Trail Guide, which is... more »

Tips:  Hydrothermal features are fragile rarities of nature. Yellowstone preserves the largest collection of hydrothermal features on the... more »

Take this guide with you!

Save to mobile
Get this guide & thousands of others on your mobile phone
EveryTrail guides are created by travelers like you.
  1. 1. Download the EveryTrail app from the App Store
  2. 2. Search for the Biscuit Basin - Yellowstone National Park guide
  3. 3. Enjoy your self-guided tour
Get the app

Points of Interest

1. Black Opal Spring

2. Wall Pool

3. Black Diamond Pool

4. Sapphire Pool

Temperature 200-202°F Dimensions 18x30 feet. Sapphire Pool, named for its blue, crystal-clear water and for its resemblance to an Oriental sapphire, was once a placid hot pool. It was not until after the 1959 earthquake that major eruptions occurred. For several years following the earthquake powerful eruptions at two hour intervals reached 150... More

5. Jewel Geyser

Temperature 199°F Interval 5-10 minutes. Duration 60-90 seconds. Height 10-30 feet. Its name is descriptive of the pearl-like sinter beads formed around the vent. Soda Geyser was the original name given by the Hayden Expedition, but turn-of-the-century visitors changed the name to Jewel Geyser. Jewel has frequent and regular eruptions. Before an... More

6. Shell Geyser

Temperature 200°F Interval 1.5 to several hours. Duration 20-90 seconds. Height 5-8 feet. The golden sinter lining of the crater resembles the shell of a bivalve, hence the name. Shell Geyser is very irregular and the interval between eruptions changes from year to year. Before an eruption, water in the crater begins to rise and may boil. Heavy... More

7. Silver Globe

8. Avoca Spring

Temperature 199°F Interval 1-18 minutes. Duration 10-30 seconds. Height 10-20 feet. The Hague Party in the late 1880s named this spring with a three-foot-diameter crater. It was not until after the 1959 earthquake that it became an active geyser. Since then it has been a frequent spouter. The fountain-type geyser, located on a rise above the other... More

9. West Geyser

10. Mustard Spring

Temperature 172-198°F Interval 5-10 minutes. Duration 5 minutes. Height 4-6 feet. Two springs, East Mustard and West Mustard springs, make up this group. The springs, separated by 50 feet, are eight to ten feet in diameter and resemble each other in shape and size. They received their name for the mustard-colored lining of their craters. Although ... More

11. Black Pearl Geyser