Skip to content

Fall Bird Migration in Iowa

Iowa's fall migration runs down the Missouri River valley, where DeSoto NWR reports 50,000 or more ducks and late fall geese on its oxbow lake, and along the Loess Hills, where two county hawkwatch sites count broad-winged hawks in September.

Agency viewing sites
3
Species documented
4
Mapped
3
Where to stand

Public viewing sites in Iowa

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.

DeSoto National Wildlife Refuge, visitor center, Bob Starr Wildlife Overlook and the auto tour FederalMarquee site

DeSoto Lake, an oxbow of the Missouri River, with bottomland forest and wetlands on the Iowa and Nebraska line

Snow gooseGreater white-fronted goose

The refuge says peak populations of 50,000 or more ducks, mostly mallards, are common during the fall migration, that late October through early December are typically the months of peak waterfowl use, and that Canada, white-fronted and snow geese along with trumpeter swans can be seen in late fall and winter resting on open portions of DeSoto Lake; bald eagle numbers peak in December. The visitor center at 1434 316th Lane, Missouri Valley, opens Tuesday to Saturday 8:30 am to 4:30 pm, the auto tour route is open from half an hour before sunrise to half an hour after sunset, and the Bob Starr Wildlife Overlook viewing blind and the Missouri River Overlook are listed; the south gate near Wilson Island and the Green Heron Trail close from October 15 to April 14 for the migration season. The state agency says the largest snow goose concentrations in Iowa have historically been here, and that western Iowa numbers have dwindled substantially in the past decade.

“Peak populations of 50,000 or more ducks, mostly mallards, are common on the refuge during the fall migration.”
US Fish and Wildlife Service, DeSoto National Wildlife Refuge, quoted exactly.

Run by US Fish and Wildlife Service

Hitchcock Nature Center hawkwatch tower Public platform

Loess Hills ridge above the Missouri River valley near Honey Creek, Pottawattamie County

Broad-winged hawkSharp-shinned hawk

The HawkCount profile describes a full time hawkwatch of roughly 600 to 800 hours a season counted from a 56 foot tower attached to the nature center lodge, with daily counts from September 1 to December 20 and part time coverage in August, run jointly by the volunteer organisation and the Pottawattamie County Conservation Board. Season averages are 915 broad-winged hawks, with a largest day of 1,206 on September 28, 2023, 779 sharp-shinned hawks, with a largest day of 237 on October 20, 2009, and 724 bald eagles. The center is reached from Crescent by the Old Lincoln Highway north to the Hitchcock Nature Center sign.

Run by Pottawattamie County Conservation, with the volunteer Hitchcock hawkwatch

Grammer Grove Wildlife Area hawkwatch Public platform

Timber and prairie southwest of Liscomb, Marshall County

Broad-winged hawkSharp-shinned hawk

The county conservation board's 121 acre wildlife area at 2030 127th Street, southwest of Liscomb, has hosted a volunteer hawk count for decades; the HawkCount profile gives a fall count season of August 1 to December 1 and season averages of 960 broad-winged hawks, with a largest day of 1,800 on September 24, 2019, and 426 sharp-shinned hawks, with a largest day of 151 on October 23, 2004. The profile locates the count on 127th Street west of Knapp Avenue and names no platform.

Run by Marshall County Conservation Board

The map

Iowa sites, refuges and the reporting record

Style
Records
Layers

Viewing sites in Iowa, 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.

Advertisement
When

When the passage peaks in Iowa

US Fish and Wildlife Service, DeSoto National Wildlife Refuge puts the Iowa peak at late October through early December. 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.

Iowa's fall movement follows the Missouri River on the west side of the state. The Service's DeSoto refuge is the anchor: it reports peak fall populations of 50,000 or more ducks with the peak from late October through early December, and geese, including snow and white-fronted geese, on the lake in late fall and winter, while the state agency says the largest snow goose concentrations in Iowa have historically been at DeSoto and that western Iowa's numbers have dwindled substantially in the past decade. The Loess Hills give the other kind of fall watching: two county conservation board sites, Hitchcock north of Council Bluffs with its 56 foot tower and Grammer Grove in Marshall County, report their raptor counts to HawkCount, with broad-winged hawk days in the last week of September and sharp-shinned hawks through October. Iowa DNR publishes weekly waterfowl migration reports in season but designates no fall viewing site of its own.

Below, one curve per species the agencies document in Iowa: 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.

Snow goose

140 research grade snow geese observations have been uploaded to iNaturalist for Iowa 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 March. An autumn month carries about 0.52 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.

Greater white-fronted goose

135 research grade greater white-fronted geese observations have been uploaded to iNaturalist for Iowa across every year the platform holds, and 16 percent of them fall in the four shaded autumn months. The busiest month in the record is March. An autumn month carries about 0.37 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.

Broad-winged hawk

101 research grade broad-winged hawks observations have been uploaded to iNaturalist for Iowa across every year the platform holds, and 27 percent of them fall in the four shaded autumn months. The busiest month in the record is April. An autumn month carries about 0.73 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

71 research grade sharp-shinned hawks observations have been uploaded to iNaturalist for Iowa across every year the platform holds, and 45 percent of them fall in the four shaded autumn months. The busiest month in the record is January. An autumn month carries about 1.64 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 Iowa lately

The most recent research grade autumn observation of each species that anyone has uploaded to iNaturalist for Iowa, as a date and the platform’s own coarse locality. Evidence that people do find snow goose and greater white-fronted goose 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 Iowa on iNaturalist...

Where Iowa counts are published

Elsewhere

Other states with agency designated migration viewing

Advertisement

Questions about Iowa

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.Iowa waterfowl seasonThe hunting calendar on the same marshes, worth knowing before standing on a dike in October.Iowa daylight hoursThe dawn and dusk flights are the spectacle, and the clock change moves them.