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Are There Great Horned Owls in Illinois?

Yes, Great Horned Owls are year-round residents throughout Illinois, inhabiting deciduous forests, river valleys, and parks despite the state's heavily agricultural landscape. These large nocturnal predators thrive in the remaining forest patches and protected areas. Illinois supports populations of this formidable raptor across both northern and southern regions.

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By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 20, 2026.

Great Horned Owl photographed in Illinois

Great Horned Owl · Dmitry Mozzherin CC BY

Great Horned Owl photographed in Illinois

Great Horned Owl · Daniel Z CC BY

Great Horned Owl photographed in Illinois

Great Horned Owl · L.J. Lamera CC BY

Photos by iNaturalist observers, reused under the licence each observer chose.
Found in Illinois
1
species recorded
42,739
GBIF records
6
birding hotspots
April, May, March
peak months

Yes, great horned owls are in Illinois. Next you'll want:

Real sighting data, source iNaturalist

1,635 verified observations on iNaturalist of great horned owl have been recorded in Illinois, most often in April, May, March.

When great horned owl are recorded in Illinois

Yes, Great Horned Owls are year-round residents throughout Illinois, inhabiting deciduous forests, river valleys, and parks despite the state's heavily agricultural landscape. These large nocturnal predators thrive in the remaining forest patches and protected areas. Illinois supports populations of this formidable raptor across both northern and southern regions.

Where Great Horned Owls Are Found in Illinois

Great Horned Owls occupy forested regions throughout Illinois, adapting to the state's heavily modified landscape. Northern Illinois forests, including the Dunes area along Lake Michigan and scattered woodlots throughout the region, provide habitat. Central Illinois, historically prairie but now with forest remnants, supports populations where oak-hickory forests persist. The Mississippi River bluffs in western Illinois provide important riparian forest habitat with steep slopes and large trees. The Illinois River valley provides another important riparian corridor. Southern Illinois forests, including areas in the Shawnee National Forest and surrounding hardwood forests, provide prime habitat with mature deciduous trees. Ozark foothills in southern Illinois support oak-hickory forests. Urban and suburban parks with mature trees throughout Chicago, Springfield, and other cities support resident populations that have adapted to human proximity. Private woodlots and protected lands throughout the state support populations. State parks and nature preserves throughout Illinois host accessible populations. Hedgerow trees and stream riparian areas in agricultural regions provide habitat for mobile hunting populations. The state's transition from northern hardwood forests to southern oak-hickory mixed forests provides diverse habitat. Seethe Great Horned Owl guide for Illinoisfor more.

Season and Timing in Illinois

Great Horned Owls in Illinois are year-round residents that do not migrate. Breeding begins early, with pairs establishing territories in December and January and laying eggs by February and early March. This early timing allows young to fledge by late spring when prey increases. The breeding season runs from December through June, with the most intense territorial calling occurring in January and February. Pairs duet loudly during this period. Eggs typically hatch in late February and March, and young fledge by May and June. Fledglings remain dependent on parents through summer and early fall. Throughout summer and fall, owls remain active but less vocal. Illinois's four-season climate provides year-round hunting opportunities with seasonal variations. Spring flooding along rivers and streams concentrates prey. Fall and winter offer challenges including reduced prey visibility. Snow cover can make winter hunting difficult, though milder Illinois winters compared to northern states reduce survival challenges. Sightings are possible in all seasons, though owls are most vocal and easily located during breeding season. Seethe Illinois wildlife guidefor more.

How to Identify a Great Horned Owl

Great Horned Owls are Illinois's largest common owl and unmistakable when observed. Adults measure 18 to 25 inches tall with wingspans reaching 60 inches. The most distinctive feature is a pair of prominent ear tufts extending from the top of the head. Illinois's Great Horned Owls typically display gray-brown or russet-brown plumage with darker streaking. The facial disc is relatively flat and broadly rounded. The eyes are large, forward-facing, and bright yellow, creating an intensely fierce expression. A dark facial mask surrounds the yellow eyes. Females are noticeably larger than males, sometimes weighing 20 to 25 percent more. In flight, Great Horned Owls appear large and powerful with broad wings and a short tail. Juvenile owls lack prominent ear tufts and appear fluffier and browner than adults. The call is distinctive, a series of deep hooting notes, typically four to five booms that sound like "hoo-hoo-hoo, hoo-hoo." In Illinois's forests and parks, this call carries considerable distances through the night. Seethe national wildlife hubfor more.

Where Sightings Concentrate in Illinois

Great Horned Owl sightings in Illinois concentrate in forested habitats and protected areas. Chicago area parks and nature preserves with mature trees provide accessible viewing opportunities for urban observers. Shawnee National Forest in southern Illinois provides the largest continuous forest habitat. Starved Rock State Park and similar protected areas offer accessible forest habitat. Illinois River valley areas provide productive riparian habitat. State parks throughout Illinois, including Matthiessen State Park, Deer Grove State Park, and others, host populations. University properties and institutional lands support populations. The Mississippi River bluffs offer spectacular habitat and reliable owl sightings. Coastal wetlands of Lake Michigan offer opportunities. Urban and suburban parks with mature trees throughout Illinois provide accessible viewing. The best viewing strategy involves visiting suitable forest habitat during the breeding season from December through March and listening for territorial calling. Early morning before dawn or at dusk offers the best chances to hear calling owls. Nocturnal visits during breeding season yield reliable sightings through audio. Daytime observations require searching dense trees. Visit/wildlife/illinoisfor more wildlife viewing opportunities.

Typical Behavior and Diet

Great Horned Owls in Illinois are fierce nocturnal predators with diets reflecting the state's central Illinois fauna. Cottontail rabbits and fox squirrels provide substantial meals, particularly in fall and winter. Gray squirrels, fox squirrels, and flying squirrels are taken regularly. Voles, mice, rats, and other rodents supplement the diet. Opossums and raccoons are taken occasionally. Great Horned Owls will hunt skunks despite their defensive spray. Waterfowl including ducks and geese provide seasonal prey. Crows, jays, and other large birds are captured when opportunities arise. The hunting strategy involves perching on prominent branches and listening intently for prey movements. The owl's exceptional night vision and asymmetrical ear placement allow pinpointing of prey. Once located, the owl dives silently at speeds exceeding 150 miles per hour. Great Horned Owls are fierce competitors for food and territory. Roosting behavior involves spending daylight hours perched in dense trees, typically in evergreen or dense deciduous cover where shadows provide camouflage. Solitary roosting is typical outside the breeding season.

Coexistence and Safety

Great Horned Owls in Illinois pose no threat to humans and can be safely observed from appropriate distances. These owls do not attack people under normal circumstances. Avoiding direct approach to active nesting sites, particularly from December through June, is respectful practice. If you encounter a fledgling owl on the ground in spring or summer, it is likely a young owl still being cared for by parents and should be left alone. Great Horned Owls are protected under federal law by the Migratory Bird Treaty Act. Illinois has no state threatened or endangered listing for Great Horned Owls. Vehicle collisions can occur in suburban and rural areas. Rodent poison can accumulate in owl tissues. Habitat loss from development and agriculture reduces available nesting sites in some regions. Coexistence is straightforward: enjoy observing these remarkable predators while maintaining respectful distance from nesting areas.

Species Confusion in Illinois

Several owl species in Illinois might be confused with Great Horned Owls, though distinctive features aid identification. The Barred Owl shares Illinois's forest habitat and is Illinois's second most common large owl. Barred Owls lack ear tufts and have dark brown eyes rather than yellow. Their facial pattern is uniformly barred and their expression is rounder and less fierce. Their hooting sounds like "who cooks for you," quite different from the Great Horned Owl's deeper call. The Barn Owl is pale-faced and lacks ear tufts. Short-eared Owls have small ear tufts and hunt in daylight. Eastern Screech-Owls are tiny. Long-eared Owls are smaller and more delicate. Size alone eliminates most confusion with Great Horned Owls being significantly larger.

Frequently Asked Questions

When are Great Horned Owls most active in Illinois? Great Horned Owls hunt primarily in the first few hours after sunset and again in the hours before dawn. Hunting activity peaks during twilight periods. What is the best season to observe Great Horned Owls in Illinois? The breeding season from December through March offers the best viewing opportunities due to increased vocal activity. Can Great Horned Owls coexist with Barred Owls in Illinois? Yes, both species share Illinois's forests and coexist through habitat preferences and hunting strategies. Competition between species occurs occasionally. Are Great Horned Owls a threat to small pets in Illinois? Small outdoor pets left at night can potentially be taken. Keeping pets indoors at night protects them from predation. Learn more about Illinois wildlife at/wildlife/illinois.

Plan your trip

Best time to see great horned owl in Illinois: April, May, March

See the month-by-month sighting calendar.

When to go

Plan your great horned owl sighting in Illinois

42,739 verified great horned owl records have been logged in Illinois, most recently in 2026. See the GBIF records.

Where to look in Illinois

Birding hotspots via eBird (Cornell Lab).

Recent great horned owl sightings

  • 21343 S Wooded Cove Dr, Elwood US-IL 41.42519, -88.10198 · 2026-07-20 07:40 · 1 seen
  • Mooseheart (restricted access) · 2026-07-20 07:24 · 1 seen
  • home · 2026-07-20 05:37 · 1 seen
  • Peoria Fire Station #16 · 2026-07-20 02:41 · 2 seen
  • Home · 2026-07-19 21:13 · 1 seen

Planning a trip to see great horned owl? Find places to stay near Lewis & Clark National Historic Trail on Booking.com.

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