Tallgrass Prairie Preserve
Oklahoma
The Joseph H. Williams Tallgrass Prairie Preserve in Osage County, Oklahoma, is the largest protected tract of tallgrass prairie globally, encompassing nearly 40,000 acres. Managed by The Nature Conservancy, it preserves a rare ecosystem that once spanned across 14 states from Texas to Minnesota but now survives in less than 4% of its original range. Located at the southern end of the Flint Hills, also known as the Osage Hills, the preserve features rocky, rolling prairies interspersed with limestone formations and well-timbered Salt Creek tributaries. Approximately 10% of the preserve is forested with species such as oak, cottonwood, ash, and sycamore, while the remainder supports tallgrass prairie with grasses reaching up to 10 feet tall. The ecosystem relies on fire, managed through a patch-burning technique to maintain the prairie and support species like the threatened greater prairie-chicken. The preserve is renowned for its free-ranging bison herd, numbering over 2,500, which graze on 21,000 acres. It also supports over 755 plant species and more than 300 bird species, making it a biodiversity hotspot. Visitors can explore the prairie via hiking trails, scenic turnouts, and a 15-mile bison driving loop. The preserve is open daily from dawn to dusk, with no admission fee, offering a unique opportunity to experience one of North America's last remaining tallgrass prairie ecosystems.
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Tip: Visit during spring and early summer for vibrant wildflowers and active wildlife, including bison and birdwatching. Check the Visitor Center schedule ahead of time to join docent-led tours, especially the historic cabin tours offered from May through October. Since the preserve prohibits hunting, fishing, camping, dogs, and off-roading, plan accordingly and stay on designated trails or the driving loop. No admission fee is charged, but donations support conservation efforts. Consider arriving early or late in the day for cooler temperatures and better wildlife viewing.
Interesting facts
- •The preserve is home to the rare prairie mole cricket, which congregates in large leks producing loud choruses in spring.
- •The endangered American burying beetle inhabits the preserve, playing a vital role in nutrient cycling.
- •The Osage Nation historically retained sub-surface mineral rights, making them some of the wealthiest people per capita in the 1920s and 1930s due to oil discoveries.
- •Pilots refer to the region as the 'Black Hole' at night due to its sparse population and darkness.
- •The preserve uses a patch-burning technique to mimic natural fires, which maintain the prairie ecosystem and benefit both bison grazing and prairie-chicken habitat.
History
The preserve was established after The Nature Conservancy purchased much of the land in 1989, which had previously been part of the large Chapman-Barnard ranch.
In 1993, Oklahoma oilman Kenneth Adams donated 300 bison to reintroduce the species, and the herd has since grown to over 2,500.
The area was historically part of the Osage Indian Reservation, with the Osage Nation retaining mineral rights that led to significant oil wealth in the early 20th century.
The preserve continues to balance conservation with ongoing oil production, maintaining over 100 active wells on the land.
Place Guide
Bison Driving Loop
A 15-mile scenic driving route through the preserve that offers close-up views of the free-ranging bison herd and diverse prairie habitats.
Hiking Trails and Scenic Turnouts
Designated trails for foot traffic only, allowing visitors to explore the tallgrass prairie and patches of Crosstimbers forest on foot, with several scenic overlooks.
Visitor Center and Historic Cabin Tours
The Visitor Center offers educational materials and docent-led tours on select days. The historic cabin, once home to Osage historian John Joseph Mathews, is open for monthly tours from May to October.
Contact
Phone: (918) 287-4803
