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    Grand Prismatic Hot Spring

    Difficulty
    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    Easy
    Duration
    This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
    0.5-1h
    Distance
    This reflects the return distance of this route as measured by the GPS file.
    2.4 km
    Elevation
    This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
    61 m
    User Ratings
    These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
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    Directions to Trailhead

    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. This trail is wheelchair-accessible and stroller-friendly and awards you with incredible views of this otherworldly natural feature. Service animals are permitted on this trail but family pets are not.

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    Route Description for Grand Prismatic Hot Spring

    The Grand Prismatic Spring is an essential trail to check out on your visit to Yellowstone National Park. This trail gets extremely busy, especially in the summer at the height of tourist season. We suggest heading out on this hike early in the morning to beat the crowds. Alternatively, you can check out this trail in the evening when most folks have cleared out for the night. The trail to the Grand Prismatic Spring is a wide, gravel path with a low incline. This route is accessible for most folks, including people who use wheelchairs or folks pushing strollers.

    The Grand Prismatic Spring is truly a sight to behold. This natural feature's vivid coloration and immense size will leave you speechless. Spanning approximately 113 m in diameter and rimmed with vivid shades of red, orange, green, and blue, it’s hard to fathom that the Grand Prismatic Spring is even real. But, no matter your age or skill level, the hike up to this otherworldly formation is definitely a must-do on your visit to Yellowstone National Park.

    To hike to the Grand Prismatic Spring, begin at the Fairy Falls Trailhead and follow the path west over the Firehole River and along Fountain Flat Drive for approximately 1.2 km to the Grand Prismatic Spring Overlook.

    Enjoy the incredible views, and be sure to snap some pictures of this awe-inspiring feature. When you are ready to head home, simply retrace your steps back to the Fairy Falls Trailhead, where you began.

    Trail Highlights

    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 113 m and a depth of approximately 49 m, 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

    Can you swim in the Grand Prismatic Spring?

    No. Absolutely not. You cannot swim in the Grand Prismatic Spring. The high temperatures and high acidity of the water would be instantly fatal to anyone who entered the Grand Prismatic Spring.

    Why is the Grand Prismatic Spring so colorful?

    The vivid colors of the Grand Prismatic Spring are caused by microbes on the water's edge.

    Insider Hints for Grand Prismatic Hot Spring

    • This trail is very busy, arrive early to beat the crowds.
    • The trail to the Grand Prismatic Spring is wheelchair and stroller-friendly, but is not paved. Accessible parking is available at the trailhead.

    Getting to the Grand Prismatic Hot Spring Trailhead

    This trail begins at the Fairy Falls Trailhead on the west side of Grand Loop Road, approximately 7.2 km northwest of the Old Faithful Visitors Center.

    Route Information

    • Backcountry Campground

      No

    • When to do

      Year-round

    • Pets allowed

      No

    • Family friendly

      Yes

    • Route Signage

      Good

    • Crowd Levels

      High

    • Route Type

      Out and back

    Grand Prismatic Hot Spring Elevation Graph

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