Guide to Midway Geyser Basin in Yellowstone National Park
The Midway Geyser Basin in Yellowstone National Park may be small, but it packs in some of the park’s biggest sights. This thermal area is home to the iconic Grand Prismatic Spring, the third largest hot spring in the world, along with the vast Excelsior Geyser and the colorful Turquoise Pool and Opal Pool. Just off the Grand Loop Road between Madison Junction and the Old Faithful area, it’s an easy stop with a short boardwalk trail that leads past some of Yellowstone’s most jaw-dropping geothermal features.
Quick Snapshot
- Location: Along the Grand Loop Road, between Madison Junction and the Old Faithful area
- Main Attractions: Grand Prismatic Spring, Excelsior Geyser, Turquoise Pool, Opal Pool
- Trail Length: About 0.8 miles round trip on a short boardwalk
- Time Needed: 45 minutes to 1 hour (longer if you add the Fairy Falls Trail overlook hike)
- Accessibility: Boardwalk and paved sections; manageable for most visitors
Why Midway Geyser Basin Is So Famous
If you’ve seen photos of Yellowstone National Park, some of the most iconic ones are of a giant pool glowing with a deep blue center and surrounded by a rainbow halo of orange and yellow. That’s the Grand Prismatic Spring. It’s the star of the Midway Geyser Basin, and it has been inspiring awe since the Hayden Expedition in the late 1800s. Even Rudyard Kipling called it “Hell’s Half Acre” when he visited, which makes sense. You really do feel like you’re standing on the edge of another world.
Related: Check out our best tips for how to see Old Faithful Geyser!
And in 2025 a bison wandered into the Grand Prismatic Spring and literally died a slow and painful death. Note: not the bison pictured below. But we did see this bison at Midway Geyser Basin. Wildlife is literally everywhere inside Yellowstone National Park!
This thermal area is small compared to the Upper Geyser Basin or Norris Geyser Basin. It’s just a few square miles. But it packs in some of Yellowstone’s most dramatic hydrothermal features. It’s also incredibly easy to visit. The Midway Geyser Basin Trail is a simple boardwalk loop that takes you right past some of the park’s most colorful and photogenic spots.
Getting There and Parking
You’ll find Midway Geyser Basin along the Grand Loop Road, a short distance south of Madison Junction. If you’re driving from the Old Faithful Inn or the Old Faithful Visitor Center, it’s your next stop after you pass Fountain Paint Pots and the Lower Geyser Basins.
The parking lot here is notoriously small for how popular the site is. On summer afternoons, it feels like everyone in the United States is trying to squeeze into the same parking spot. To save yourself frustration, aim for early morning or late evening. If you can’t find a spot, don’t stress out. Just loop back after exploring one of the nearby scenic drives like Firehole Canyon Drive or Firehole Lake Drive.
Once you park, there are vault toilets in the parking lot area. That is very convenient.
The Boardwalk Trail
The Midway Geyser Basin trail is short at less than a mile round trip. But it feels bigger than it is because the views are out of this world. The entire trail is a wooden boardwalk that loops past the geothermal features. It’s easy for kids and manageable for most strollers or wheelchairs.
Keep in mind: this is an extremely hot and fragile thermal area. Stay on the trail. The thin crust of silica minerals around the springs can break through, and the high temperatures (often above 160–190 degrees Fahrenheit) mean stepping off isn’t just breaking the rules, it’s truly dangerous.
For real, every time we visit I see parents with toddlers and I cringe because that could end so badly so easily…. and I say a quick prayer that the toddler stays where they are supposed to stay.
When you first get on the boardwalk trail, you walk over a bridge to cross the Firehole River. This is the first spot that will cause your jaw to drop. The runoff from the thermal pools (specifically Excelsior Geyser) is literally running off into the river. It’s super impressive to watch!
The Main Attractions
Grand Prismatic Spring
This is the crown jewel. Grand Prismatic Spring is the third largest hot spring in the world and Yellowstone’s largest hot spring. To give you a sense of scale, it’s about the size of a football field.
Standing on the boardwalk, you’ll notice the deep blue center surrounded by brilliant colors; yellows, oranges, and reds created by thermophilic bacteria living in the progressively cooler water along the edges. The multicolored layers shift with the seasons as new mats of bacteria grow and die back. It’s mesmerizing.
Because you’re at water level, you don’t always get the postcard view. On cool mornings, steam often covers the surface of the spring, so give yourself time. If the sun comes out, the steam usually clears.
We have visited during July and in early May. In July at midday you will see the spring a lot more clearly. In May, there was tons of steam rising from the springs even at the hottest part of the day. It was still really fantastic… just not as brilliant as on a sunny day in the summer.
Pro-tip: Even on the hotter summer days, it’s worth it to arrive at Midway Geyser Basin after about 11am/noon. This is when the steam will largely dissipate. Of course, most of the savvy Yellowstone visitors will have the same idea as you, so just be patient.
Pro-tip #2: When you are planning your Yellowstone National Park itinerary, be flexible and watch the weather like a hawk. If there is a threat of rain or overcast days, try to avoid those days and visit Midway Geyser Basin on a day that has sunny weather. It really will impact your view.
Excelsior Geyser Crater
Right next to Grand Prismatic is the massive Excelsior Geyser. It’s technically a dormant fountain-type geyser, though in the 1880s it erupted so violently it damaged itself.
Today it behaves more like a spring, pumping more than 4,000 gallons of water per minute into the adjacent Firehole River. Standing here, you can feel the heat in the mist and see the brilliant turquoise water swirling at the center.
And like the Grand Prismatic Spring, you will see more of this geyser when it’s warm and sunny out.
Turquoise Pool and Opal Pool
Don’t rush past the smaller springs on your way to Grand Prismatic. Turquoise Pool glows with—you guessed it—a striking blue color, especially on sunny afternoons. Opal Pool changes with the seasons, sometimes pale, sometimes dark. These quieter pools are some of my favorites because they show off Yellowstone’s variety without the crowds.
Hiking to the Grand Prismatic Overlook
The boardwalk gives you an up-close look, but the best place to actually see the spring’s “rainbow eye” shape is from above. For that, you’ll want to hike the Fairy Falls Trail.
The trailhead is just south of the main parking area for Midway. It’s an easy 1.2-mile walk (about 2.4 miles round trip) on a paved path and dirt trail. Ok, easy is relative. It’s short but if you are out of shape (like me!), it’s uphill for 1.2 miles. And then downhill for 1.2 miles. I would say it’s totally worth it to see the Grand Prismatic Spring from above though. Just go slowly and bring water!
About halfway in, a spur leads to the viewing platform overlooking Grand Prismatic. From here, you’ll see the full rainbow of colors radiating out from the deep blue center—a view you just can’t get from the boardwalk.
Plan for at least an hour if you want to include the overlook. Bring water and maybe a snack. It’s not a long hike, but it can feel hot and exposed in summer. And yeah, the hike there is completely uphill.
Practical Notes
- Best time to visit: Early morning or late evening for lighter crowds. Midday offers the most vivid colors, but it’s also the busiest.
- Seasonal access: The trail and boardwalk are open spring through fall. In the winter months, the area is accessible by snow coach or guided tours. Note: there are times of the year (mostly Spring I think) where the Overlook trail won’t be open due to bear mating activity.
- Nearby stops: Combine this with Fountain Paint Pots (and the Fountain Paint Pot Trail) or head to Great Fountain Geyser and White Dome Geyser along Firehole Lake Drive.
- Check official websites: For updated conditions, road closures, and safe visiting tips, the gov website (an official government organization) is your most reliable source of info. Avoid random blogs that might give sensitive information without context.
Wrapping It Up
The Midway Geyser Basin is small, but it’s unforgettable. In just a short boardwalk loop, you’ll see the largest and most colorful spring in Yellowstone, a geyser that once rivaled the largest geyser in the park, and a handful of smaller pools glowing like jewels.
Take your time, let the steam clear, and don’t skip the overlook hike. Seeing the rainbow of colors of Grand Prismatic Spring from above is one of those moments you’ll carry with you long after your trip is over.
If you only make one quick stop outside the Old Faithful area, make it this one.
