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Fall Bird Migration in Illinois

Illinois funnels its migrating hawks down the Lake Michigan shoreline, and the volunteer count at Illinois Beach State Park in Zion works that line from late August into the last week of November.

Agency viewing sites
1
Species documented
2
Mapped
1
Where to stand

Public viewing sites in Illinois

Every place below is one an agency itself describes for watching the fall passage, with the agency named and linked, the species it documents there, the months it names as the peak, and the facility that exists: a tour route, a platform, a tower, a visitor centre. Where the agency wrote a sentence worth reading, it is quoted exactly.

Illinois Beach State Park hawk watch, Zion Public platformMarquee site

The only beach ridge shoreline in the state: low dunes, sand prairie, savanna and marsh along six and a half miles of Lake Michigan

Broad-winged hawkSharp-shinned hawk

The Illinois Nature Preserves Commission describes the 1,266 acre preserve in Lake County as an excellent area to see hawks, falcons and shorebirds during migration, on terrain that runs from lakeshore and foredune through sand prairie, savanna, fen, panne, sedge meadow and marsh. The HawkCount profile places the watch in the northeastern corner of the state on the Lake Michigan shoreline and calls it an all volunteer effort, with a season running August 25 to November 25 and broad-winged and sharp-shinned hawks both on the tally.

“The preserve is in an excellent area to see hawks, falcons and shorebirds during migration.”
Illinois Nature Preserves Commission, Illinois Beach Nature Preserve, quoted exactly.

Run by Illinois DNR state park and dedicated nature preserve; volunteer count reporting to HawkCount

The map

Illinois sites, refuges and the reporting record

Style
Records
Layers

Viewing sites in Illinois, with the national wildlife refuges in the state drawn underneath. The coloured grid is where people have uploaded a verified sandhill crane record to iNaturalist in September, October, November and December, brighter where more have been logged. It is a map of reports rather than of birds: it thickens around refuges, car parks and towns because that is where observers stand, and it shows past reports rather than birds present today. Pins are public viewing sites an agency itself describes; grey dots are US Fish and Wildlife Service refuges and hatcheries, drawn because the refuge system is where most of the staging happens.

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When

When the passage peaks in Illinois

HawkCount.org site profile, Illinois Beach State Park puts the Illinois peak at Late August to late November, the span the volunteer count at Illinois Beach State Park works. That describes a pattern across past autumns. The week itself swings with the weather: a cold front to the north moves cranes and geese south in a single night, and a warm spell holds them for weeks. Dawn and the last hour before dusk are when cranes and geese move between the fields and the water, and that movement is the spectacle the platforms are built for.

Illinois is a shoreline story in the fall. Hawks moving south along the western edge of Lake Michigan are reluctant to strike out over open water, so they hold the coast, and the state's one fall count sits on that line at Illinois Beach State Park in Zion. The count is a volunteer effort working from late August to late November. Away from the lake, the state's two federal refuges on the Illinois River, Chautauqua and Emiquon, are famous for snow geese, but both refuges put the snow goose spectacle in late February and early March and describe their own fall as a duck season, so neither is listed here.

Below, one curve per species the agencies document in Illinois: every research grade observation members of the public have uploaded to iNaturalist for the state, by calendar month across every year the platform holds, with September to December shaded. Counts of uploads, so they measure observers as well as birds, and the shape is worth reading where the absolute numbers are not.

Broad-winged hawk

388 research grade broad-winged hawks observations have been uploaded to iNaturalist for Illinois across every year the platform holds, and 21 percent of them fall in the four shaded autumn months. The busiest month in the record is April. An autumn month carries about 0.54 times as many uploads as an average month outside autumn. People upload most of everything in July, so a bar that rises after that is the stronger signal. Counts of what people reported, measuring observers as well as birds. See the autumn records.

Sharp-shinned hawk

300 research grade sharp-shinned hawks observations have been uploaded to iNaturalist for Illinois across every year the platform holds, and 54 percent of them fall in the four shaded autumn months. The busiest month in the record is October. An autumn month carries about 2.38 times as many uploads as an average month outside autumn. People upload most of everything in July, so a bar that rises after that is the stronger signal. Counts of what people reported, measuring observers as well as birds. See the autumn records.

Sandhill cranes flying in a loose line across a pale open sky, necks held straight out in front and long legs trailing behind them
Sandhill cranes crossing a refuge on the morning flight. The movement is watched from the designated pullout or platform: the birds settle on shallow water for the night, and the roost itself is the one place a viewing site is never placed. “Sandhill cranes flying over Sherburne National Wildlife Refuge (24542820818)” by USFWS Midwest Region from United States, CC BY 2.0
Latest reports

What people have reported in Illinois lately

The most recent research grade autumn observation of each species that anyone has uploaded to iNaturalist for Illinois, as a date and the platform’s own coarse locality. Evidence that people do find broad-winged hawk and sharp-shinned hawk here. Each is one bird on one past day: the flocks move with the weather, so where they are this week is what the agency page and its counts answer.

Checking the most recent autumn uploads for Illinois on iNaturalist...

Where Illinois counts are published

Elsewhere

Other states with agency designated migration viewing

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Questions about Illinois

Inventory compiled 2026-09-19 from the agency pages linked above. Agency text is quoted exactly with its source named and linked; the observation curves and latest reports are counts and dates from public uploads to iNaturalist.

Winter eagle watching in IllinoisThe same refuges and rivers three months later, when the ice concentrates the eagles.Illinois waterfowl seasonThe hunting calendar on the same marshes, worth knowing before standing on a dike in October.Illinois daylight hoursThe dawn and dusk flights are the spectacle, and the clock change moves them.