Midway Geyser Basin Trail

The Midway Geyser Basin Trail is one of the most popular trails in Yellowstone National Park. This trail is very busy, especially in the summertime, so it’s best to start your hike early in the morning to beat the crowds. In the late season, the boardwalk gets icy. If you are hiking in late October, we suggest bringing along a set of traction devices such as microspikes for some extra grip.

On the Midway Geyser Basin Trail, you will pass by a series of spectacular thermal features, including the Grand Prismatic Spring, The Excelsior Geyser, Turquoise Pool, and Opal Pool. With so much to see in less than a mile of trail, the Midway Geyser Trail is a great bang for your buck.

Beginning at the Midway Geyser Trailhead, follow the boardwalk clockwise past the Excelsior Geyser, the Grand Prismatic Spring, the Opal Spring and the Turquoise Spring. Just after the Turquoise Spring, you will find yourself back at the trailhead where you began.

If you are looking for more to explore in the area, check out the Fairy Falls Trail just down the road.

Trail Highlights

Excelsior Geyser

The Excelsior Geyser is a dormant fountain-type geyser. Though now inactive, this geyser used to erupt dramatically, shooting water between 100ft–300ft in the air. This dramatic eruption was captured in 1886 by F. Jay Haynes whose photograph of the Excelsior Geyser now lives at the San Francisco Museum of Modern Art.

Opal Pool

The Opal Pool is an active hotspring and a fountain-type geyser. The Opal Pool rarely erupts and the eruptions are unpredictable but when they go, this geyser shoots hot water 20ft–70ft in the air.

Turquoise Pool

The Turquoise Pool is a hot spring that was named by the Hayden Expedition in 1878. The temperature of this pool sits between 142-160 degrees Fahrenheit (61-71 degrees Celsius).

The Grand Prismatic Spring

The Grand Prismatic Spring is the largest natural hot spring in the United States of America and the third largest hot spring in the World. With a diameter of approximately 370ft and a depth of approximately 160ft, this spring is well known for its vivid, prismatic colors. The spectacular rainbow of color that gives this spring its name is caused by microbial mats: multi-layered sheets of microorganisms, largely bacteria, on the edges of the water.

These microorganisms make the shoreline of the spring bright red, orange, yellow, and green. In the summertime, these mats are usually shades of red and orange, and in the winter, they shift to the cooler greens and blues. With an average temperature of 160 degrees Fahrenheit (70 C), you cannot enter or go near the spring; the high acidity of the water combined with the scalding temperature would be instantly fatal to anyone who tried. The Grand Prismatic Spring is truly an otherworldly sight and well worth a stop on your visit to Yellowstone National Park.

Frequently Asked Questions

What entrance is the Midway Geyser Basin?

The Midway Geyser Basin is best accessed through Yellowstone National Park’s West Entrance.