America’s last wild prairie is in Oklahoma and 2,000 bison are running it

The grassland that almost disappeared

Most people drive right past Oklahoma’s Osage County without stopping. That’s a mistake.

About 90 minutes from Tulsa, just north of the small town of Pawhuska, nearly 40,000 acres of open grassland roll out in every direction like a green ocean that never ends.

This is what most of America looked like before the plows came.

More than 2,000 bison roam it freely, and on any given day, a few of them might be standing in the middle of your road.

The 4% of a prairie that survived

Tallgrass prairie once ran across 14 states, from Texas all the way up to Minnesota. Then came the farmers, the cities, and the railroads.

Less than 4 percent of the original prairie still exists. What saved this particular stretch wasn’t luck exactly.

The land here sits on rocky limestone, part of a ridge system called the Flint Hills that runs south from Kansas into Oklahoma. The rock made plowing almost impossible, so the grass stayed.

The rest of the country wasn’t so fortunate.

How The Nature Conservancy saved this land

In 1989, The Nature Conservancy bought the 29,000-acre Barnard Ranch and started building what would become the Joseph H. Williams Tallgrass Prairie Preserve.

Today it covers nearly 39,650 acres and holds the title of the largest protected remnant of tallgrass prairie on Earth. The preserve sits in Osage County, about 15 miles north of Pawhuska.

It’s open every day from dawn to dusk, and admission costs nothing. You just drive up and go.

Bison came back in 1993 and never left

When the first 300 bison arrived in 1993, it marked the return of an animal that had been gone from this land for generations. That herd has grown to more than 2,000, one of the largest free-roaming herds in the country.

Every fall, crews round them up for health checks, vaccinations, and a full count. Some bison are sold each year to keep the herd at a size the land can actually feed.

The rest go back to the grass, doing what they’ve always done.

Drive the 15-mile bison loop at a crawl

A 15-mile gravel road cuts through the heart of the preserve’s bison unit, and this is where things get interesting. Bison graze right up to the road.

Sometimes they block it entirely, and there’s nothing to do but wait while a 2,000-pound animal decides it’s done standing there. Four scenic pullouts give you wide views of the rolling grass in every direction.

The full loop takes about an hour if you go slow and stop often, which is exactly how you should drive it. Picnic spots sit along the route if you want to stretch out and eat.

Two trails wind through open grass and creek forest

The hiking is quieter than the bison loop but worth the time. A short self-guided nature trail near Salt Creek runs easy and flat, fine for any age.

The Prairie Earth Trail covers about 2 miles and climbs through steep hills and rough terrain. Give yourself one and a half to two hours for that one, and check recent weather before you go because it gets muddy.

Both trails cross through a mix of open grassland and riparian forest along Salt Creek, and bison are often visible just on the other side of the fence.

Wildflowers take over from May through June

The warm months bring color. Mid-May through mid-June is when the fields fill out with coneflowers and blazing star spread across the hillsides.

Big bluestem and switchgrass start growing in April and, in a good year, some of those grass species will top out taller than a person. A smaller wave of wildflowers comes back again in late summer.

About 10 percent of the preserve is wooded, with oak and cottonwood lining the creek bottoms in what’s called the Cross Timbers belt. That strip of trees breaks up the open grass and gives you something to walk toward.

300 bird species call this prairie home

Bring binoculars. More than 300 bird species have been recorded on the preserve, and what you see depends entirely on when you come.

In late March through early May, greater prairie chickens gather at sunrise and perform their booming mating display, a sound you’ll hear before you spot the birds.

By late spring, Dickcissels and scissor-tailed flycatchers show up from the south.

Come fall or winter and you’re watching bald eagles, golden eagles, red-tailed hawks, and northern harriers work the sky. Painted buntings and eastern bluebirds fill in the gaps during warm months.

The prairie holds more wildlife than you’d expect

Bison get the attention, but the preserve runs deeper than that. White-tailed deer, coyotes, bobcats, and badgers move through the grass.

So do armadillos, beavers, and woodchucks. The American burying beetle, a federally endangered species, lives here.

And tucked into the soil is the prairie mole cricket, a rare insect whose calls researchers are actively studying for possible hearing aid technology.

More than 80 mammal species live on the preserve in total, plus insects, reptiles, and things that haven’t made the news yet.

Fire is what keeps the prairie from becoming forest

Left alone, tallgrass prairie turns into brushland within a few decades.

The Osage people understood this long before scientists did, burning sections of the prairie for centuries to push up fresh grass. The Nature Conservancy continues that practice today.

Every year, crews burn about one-third of the land on a rotating schedule, a method called patch burning. The fire creates a patchwork of habitats at different stages of regrowth.

Bison follow the burn, gravitating toward the tender young grass that sprouts up first after the smoke clears.

A stone cabin where an Osage author wrote his life’s work

In 1932, Osage author and historian John Joseph Mathews built a stone cabin on this land he called The Blackjacks.

Mathews grew up in Pawhuska, flew as a World War I pilot, and studied at both the University of Oklahoma and Oxford. He spent decades at the cabin writing five books, including a celebrated history of the Osage people.

He asked to be buried near the cabin, and in 1979, he was. The Nature Conservancy bought the cabin and surrounding land in 2014 and restored it.

Free guided tours run on the fourth Saturday of each month from May through October, but you need a reservation sent by email in advance.

The visitor center sits in a historic ranch headquarters

The visitor center occupies the old headquarters of the Chapman-Barnard Ranch, and the main building carries a listing on the National Register of Historic Places.

A restored cowboy bunkhouse stands on the grounds beside it.

Volunteer docents walk you through the story of the prairie, the wildlife, and the history of the land. The center runs on select days from 10 a.m. to 4 p.m., so check the schedule before making the drive.

Oklahoma State University also runs a research station nearby. No dogs anywhere on the preserve.

Ground-nesting birds are highly sensitive to them, and the rule is firm. No camping, no hunting, no collecting anything from the land.

And when you see the bison, stay in the vehicle.

Visit the Joseph H. Williams Tallgrass Prairie Preserve in Oklahoma

You can reach the preserve by heading about 15 miles north of Pawhuska on county roads through Osage County.

It sits roughly 90 minutes from Tulsa with no admission charge and no reservation needed to drive the bison loop or walk the trails.

The visitor center at the old ranch headquarters is open select days from 10 a.m. to 4 p.m. For cabin tour reservations, contact tallgrass. docents at gmail.

Check the schedule and any seasonal notes at the official website before you head out.

This article was created with AI assistance and human editing.

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