The preserve is a site of active ecological restoration, with ongoing controlled burns used to maintain the prairie ecosystem.
It is identified as an Important Bird Area (IBA) by the National Audubon Society due to the population of rare grassland birds.
The landscape was significantly modified by historical grazing, necessitating long-term seed dispersal and invasive species removal projects.
The preserve contains multiple vernal pools that support amphibians and provide essential habitat for migratory waterfowl.
Hydrological restoration has involved the removal of drainage tiles installed during the area's agricultural past to restore natural water flow.
Orland Grassland is a 960-acre nature preserve in Cook County, Illinois, managed by the Forest Preserves of Cook County. It features a large-scale ecological restoration project that has successfully re-established native tallgrass prairie, sedge meadows, and oak savanna. The site is designated as an Important Bird Area, known for hosting grassland-dependent bird species like bobolinks and Henslow's sparrows. Visitors traverse the preserve via a network of gravel and mown-grass trails that circle wetlands and rolling prairie hills. The terrain is largely exposed, reflecting its history as a site for grazing and agriculture prior to extensive conservation efforts. It serves as a critical corridor for wildlife movement and provides significant groundwater recharge for the surrounding region.
The elevated boardwalk and lookout points that provide an expansive view over the prairie horizon.
Bring binoculars as the open landscape offers excellent long-range bird watching opportunities.
Apply sunscreen and insect repellent, as there is very little shade along the primary trails.
Check local conservation alerts for controlled burn notices, which may cause temporary trail closures.
Do not attempt to hike the trails immediately after heavy rain, as low-lying sections can become saturated and muddy.
Open daily from sunrise to sunset; parking areas may be inaccessible during extreme weather events.
Stay on marked trails to protect sensitive prairie vegetation and avoid disturbing nesting wildlife; carry out all trash.
