This free Nebraska park looks like the moon and the gate never closes

It’s in the state’s emptiest corner

Toadstool Geologic Park sits in the far northwestern corner of Nebraska, north of the small town of Crawford, inside the Oglala National Grassland.

The U.S. Forest Service manages it, and the gate never closes. No crowds, no gift shops, no entrance booths.

Just eroded clay and silence on the High Plains. People who come here call it Nebraska’s Badlands, and the landscape backs that up.

The ground looks like it belongs on another planet, and the fossils locked inside it go back 30 million years.

Volcanic ash from the West built this place

The rock here started forming between 38 and 24 million years ago, during the late Eocene and Oligocene epochs.

Volcanoes erupting far to the west in what is now the Great Basin sent ash drifting over the plains, and it settled in layers with clay, silt and sand.

Rivers running from the Rockies and the Black Hills dropped coarse sand that hardened into sandstone. Geologists use Toadstool as the measuring stick for similar-aged rock across North America.

The same layers show up at Badlands National Park in South Dakota.

Giant stone mushrooms that keep crumbling and rebuilding

The formations that give the park its name look exactly like oversized mushrooms.

Narrow pedestals of soft clay hold up flat slabs of harder sandstone, and wind and rain carve them a little more every season. Freeze-thaw cycles crack the rock along weak points and speed the sculpting along.

Some famous toadstools have collapsed in storms. New ones keep forming.

You’ll see them in every stage, from a few feet tall to massive blocks many meters high, all slowly changing shape around you.

Rhinos, saber-toothed cats and hell pigs once roamed here

The rocks hold fossils and footprints of creatures that walked this ground about 30 million years ago. Ancient rhinoceroses, three-toed horses, giant tortoises, early camels and saber-toothed cats all left traces.

Entelodonts, sometimes called “hell pigs,” were massive predators that show up throughout the fossil record here, along with hyaenodonts.

Oreodonts, sheep-sized herbivores with no modern relatives, are among the most common finds in this region. Federal law prohibits collecting anything, so you look and leave it all in place.

Follow a three-quarter-mile chase scene frozen in rock

Preserved along an ancient stream channel is a trackway that stretches nearly three-quarters of a mile. The U.S. Forest Service considers it the longest known mammal trackway from the Oligocene epoch.

Two species of rhinoceros left prints heading downstream, and then entelodonts started following. The spacing of the tracks tells scientists the rhinos broke into a gallop as the predators closed in.

Giant tortoises and an early cat species called Dinictis left prints in the same stretch.

Walk the one-mile loop past formations in every stage

The most popular trail is a one-mile loop that starts at the campground trailhead.

Numbered posts along the route match a self-guided brochure that explains the geology, fossils and formations at each stop.

You wind through eroded clay and sandstone, passing toadstools in various stages of their life cycle. A few sections ask for light rock scrambling, but most hikers handle it fine.

There is zero shade on this trail, so bring water and wear a hat.

Hike three miles across open prairie to a bison mystery

The Bison Trail leaves the interpretive loop and crosses three miles of open grassland to the Hudson-Meng Education and Research Center.

You follow the Oglala National Grassland through rolling prairie with wide views of the Pine Ridge and, on clear days, the Black Hills of South Dakota.

This trail is part of the Great Plains Trail, a network of public land paths that runs from Guadalupe National Park in Texas to the Canadian border. Spring and fall are the best times to hike it.

600 ancient bison died here and nobody knows why

Hudson-Meng holds the remains of up to 600 bison that died at this spot roughly 10,000 years ago. Two local ranchers, Bill Hudson and Albert Meng, found the bones in 1954 while digging a cattle pond.

The bison are a transitional form between the extinct Bison antiquus and today’s Bison bison. Teams of archaeologists have dug here since the 1970s, and the cause of the mass death is still debated.

The center opens seasonally on Fridays only, from Memorial Day weekend through Labor Day weekend.

Spot pronghorn on the five-mile grassland loop

A five-mile loop trail starts at the campground and heads north through open badlands and mixed-grass prairie on the Great Plains Trail.

After about 1.5 miles, the trail meets the 918 Road, which loops back to the Bison Trail and the campground. You cover more ground here, and the grassland opens up around you in every direction.

The Oglala National Grassland is one of the best places in Nebraska to spot pronghorn and prairie dog colonies, so keep your eyes on the flats.

Step inside a sod house built the old way

Near the campground entrance stands a reconstructed sod house the Forest Service built in 1984, close to the site of an earlier one.

With no timber on the treeless plains, settlers cut ribbons of prairie sod into bricks about two feet long, one foot wide and four inches thick.

They stacked them into walls that kept homes cool in summer and warm in winter, though the rooms were cramped and dark. Sod houses were among the most common dwellings for Nebraska pioneers in the late 1800s.

You can walk right inside this one.

Camp under a sky with zero light pollution

Toadstool sits in Sioux County, one of the least populated areas in the continental United States. There is virtually no light pollution here, which makes it one of the best dark-sky spots on the Great Plains.

The campground has sites with picnic tables, fire rings and vault toilets, but no water or electricity. Cell service does not exist at the park.

You sit at your fire ring at night with nothing between you and the Milky Way, and the only sound is wind moving through the grass.

Bring your own water and check the road conditions

The park is about 20 miles from Crawford, and the last 11 miles run on unpaved gravel roads.

Rain or snow can make them impassable, so a high-clearance vehicle is a good idea and four-wheel drive helps in wet conditions. There is no water at the park, so bring everything you need.

Day use costs $3 per vehicle, and camping runs $15 per night. The nearest gas, food and lodging are back in Crawford, so plan before you head out.

Explore Toadstool Geologic Park in Nebraska

You can visit Toadstool Geologic Park year-round, 24 hours a day.

From Crawford, take Nebraska Highway 2 north about four miles to Toadstool Road, then follow gravel roads roughly 13 miles to the campground.

The U.S. Forest Service’s Pine Ridge Ranger District manages the park, and you can check with them for current road conditions before you go.

While you’re in the area, the Hudson-Meng site is a three-mile hike or short drive away, and Agate Fossil Beds National Monument sits about 56 miles south.

This article was created with AI assistance and human editing.

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