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Fall Bird Migration in Maine

A coastal state whose fall flight is raptors following the Atlantic shore: the National Park Service runs a public hawk watch near the summit of Cadillac Mountain from late August into October, while the state agency describes snow and white-fronted geese only as birds that pass through.

Agency viewing sites
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Species documented
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Mapped
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Where to stand

Public viewing sites in Maine

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.

Cadillac Mountain Hawkwatch, Acadia National Park FederalMarquee site

Granite summit ridge at 1,530 feet above Frenchman Bay, on the Atlantic flyway

Broad-winged hawkSharp-shinned hawk

The park describes a drop-in hawk watch 200 yards down the Cadillac North Ridge Trail from the summit parking lot, staffed by rangers and Schoodic Institute volunteers 9 to 2, seven days a week, weather permitting, from late August with counts typically ending by mid-October. Its Birding Cadillac page names broad-winged hawk, American kestrel and sharp-shinned hawk as the common fall species and its 2023 report puts the peak in mid-September. A vehicle reservation is required to drive the Cadillac Summit Road from mid-May to mid-October; no reservation is needed to hike up. The trail to the site is rocky and uneven.

“The Hawk Watch site is indeed at the top of Cadillac Mountain, but is a little off the beaten path, 200 yards down the North Ridge Trail.”
National Park Service, Acadia National Park, quoted exactly.

Run by National Park Service, Acadia National Park, with Schoodic Institute

The map

Maine sites, refuges and the reporting record

Style
Records
Layers

Viewing sites in Maine, 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 Maine

National Park Service, Acadia National Park, Riding the Winds hawk watch reports 2019 and 2023 puts the Maine peak at mid-September, with counts running from late August and typically ending by mid-October. 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.

Maine's fall migration runs down the coast. The National Park Service writes that the Atlantic shore acts as a leading line that funnels raptors from northern and eastern Maine and eastern Canada over Mount Desert Island, which is why a hawk watch on Cadillac Mountain has counted roughly 2,500 to 3,000 raptors a season for three decades, most of them sharp-shinned hawks and American kestrels, with kettles of broad-winged hawks on the best mid-September days. The park publishes weekly Riding the Winds reports and posts daily totals to HawkCount. For geese, the state wildlife agency's waterfowl page says the snow goose, white-fronted goose and Atlantic brant are only observed in Maine as they migrate through, and it names no staging site for them.

Below, one curve per species the agencies document in Maine: 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

764 research grade broad-winged hawks observations have been uploaded to iNaturalist for Maine across every year the platform holds, and 13 percent of them fall in the four shaded autumn months. The busiest month in the record is August. An autumn month carries about 0.3 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

151 research grade sharp-shinned hawks observations have been uploaded to iNaturalist for Maine across every year the platform holds, and 50 percent of them fall in the four shaded autumn months. The busiest month in the record is September. An autumn month carries about 1.97 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 Maine lately

The most recent research grade autumn observation of each species that anyone has uploaded to iNaturalist for Maine, 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 Maine on iNaturalist...

Where Maine counts are published

Elsewhere

Other states with agency designated migration viewing

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Questions about Maine

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