When Do Birds Migrate North and South Each Year?
When do birds migrate? For most migratory birds in North America, spring is the season to return north to their breeding grounds, while movement south begins in late summer and fall. But these are not two fixed dates. They are seasonal windows that can last for months. The southern coast may see the first early-spring migrants in January or February, while spring migration in northern and high-elevation areas can continue into late May or early June.
Fall migration can begin as early as July and continue into November or early winter.
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Common Migratory Bird
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Spring Window
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Fall Window
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Purple Martin
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January–May
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July–September
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Ruby-throated Hummingbird
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March–May
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August–October
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Baltimore Oriole
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April–May
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July–September
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Broad-winged Hawk
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April–May
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September–October
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Sandhill Crane
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February–April
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September–November
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White-throated Sparrow
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March–May
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September–November
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Part 1. When Does Spring Migration Start?
Spring migration usually begins in southern North America and gradually moves north as the season warms.
Early northbound birds may appear in the southernmost United States in late February. Activity becomes more noticeable along the Gulf Coast, in the Southeast, and in the southern Southwest beginning in March. Migration waves reach the central United States in April, then arrive more heavily in the northern United States and Canada in May.
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North American Region
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Spring Arrival
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Southernmost United States
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Late February
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Gulf Coast, Southeast, and southern Southwest
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March
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Southern to south-central United States
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Early April
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Central United States, Mid-Atlantic, and southern edge of the northern interior
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Late April
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Northern United States and southern Canada
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May
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Alaska and northern Canada
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Late May
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By species, the earliest arrivals in the South are often some waterfowl, blackbirds, short-distance migrants, and early arrivals such as Purple Martins. As migration advances into the central regions, cranes, raptors, shorebirds, and more long-distance songbirds join the movement. From late April through May, insect-eating songbirds such as warblers, thrushes, and orioles become more concentrated in the north-central United States, around the Great Lakes, and in the Northeast. Arrivals at higher elevations and more northerly breeding grounds may be delayed until late May or early June.
Part 2. When Do Birds Migrate South?
Fall migration runs in the opposite direction from spring migration: birds gradually move south from breeding grounds in Alaska, Canada, and the northern United States. Some adult shorebirds begin moving in late July, and migration expands in August. September and October are the months when migration waves are easiest to observe across much of the United States, while some late migrants continue into November or early winter.
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North American Region
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Fall Departure
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Alaska and northern Canada
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Late July
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Central and southern Canada and the northernmost United States
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August
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Northern and central United States
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Early September
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South-central United States
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Late September
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Parts of the southern United States
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October
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Southern Florida, the southern tip of Texas, and similar areas
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Early November
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Early southbound migrants mainly include some adult shorebirds, swallows, orioles, and early-migrating warblers. In September and October, nocturnal songbirds, raptors, and more shorebirds pass through the Great Lakes, Northeast, Great Plains, and Mississippi Valley. By October and November, sparrows, waterfowl, and short-distance migrants may still be moving south and arriving along the Gulf Coast, in the Southwest, and in the Southeast.
Part 3. A Month-by-Month Framework, Not a Fixed Calendar
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Stage
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Approximate Months
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Birds Likely to Be Most Active
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Late winter–early spring
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January–March
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Waterfowl, blackbirds, short-distance migrants, and early arrivals in the southern United States
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Spring peak
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April–May
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Long-distance insect-eating songbirds such as warblers, thrushes, and orioles, as well as some shorebirds and raptors
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Early migration in late summer
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July–August
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Adult shorebirds, swallows, orioles, and early-migrating songbirds
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Fall peak
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September–October
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Nocturnal songbirds, raptors, shorebirds, and many long-distance migrants
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Late-fall tail end
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October–November and early winter
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Sparrows, waterfowl, and late short-distance migrants
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On the East and West Coasts, shorelines and headlands can concentrate migrating birds. In the Mississippi Valley and Great Plains, migration waves more often form along river valleys, wetlands, and inland corridors. The Gulf Coast is an important fueling area before and after Gulf crossings, while mountain routes such as the Rockies follow different rhythms because of elevation, snow cover, and rising air currents.
Part 4. How to Track Migration Near You
1. Track Migration in the Field
The key to tracking migration in the field is choosing landforms that concentrate migrating birds, then observing repeatedly at suitable times and in suitable weather. Coastal headlands, barrier islands, lakeshores, wetlands, river valleys, forest edges, open farmland, and ridges each suit different kinds of migratory birds.
Before tracking migration, choose your timing and observation site according to your region and local terrain.
Northeastern United States and Great Lakes: In spring, focus on woodlands, lakeshores, and urban green spaces in April and May. In fall, focus on mornings after cold fronts from August through October, when coastal headlands and lakeshores can concentrate resting birds.
Central United States, Great Plains, and Mississippi Valley: Wetlands, river valleys, and open farmland are important corridors for waterfowl, cranes, and many other migratory birds. Repeated observation is worthwhile from February through May in spring and from August through November in fall.
Southern United States, Gulf Coast, and Southeast: Northbound migrants appear earlier from late winter into early spring, while southbound birds continue arriving into November in fall. Coastlines, barrier islands, wetlands, and urban green spaces can serve as fueling sites before and after Gulf crossings.
2. Track Migration From Your Backyard
Backyard observation is not meant to cover an entire region. It provides a continuous record of one small location.
Manual observation can easily miss the hours when no one is watching. The Kiwibit Bird Feeder 2 Pro can keep recording backyard visitors, helping users review how bird activity changes before and after migration season:
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Auto-focus tracking: Follows birds while they perch, feed, or move, keeping the subject clear.
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Slow-motion playback: Records wingbeats, takeoffs, and feeding behavior for closer review.
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FeatherPal™ visitor tracking: Saves visitor footage by time in the Kiwibit App and combines bird identification with the returning visitor feature, helping users compare which birds appear for the first time, return, or gradually become less frequent.
To see changes more clearly, summarize the first appearance dates, visit frequency, new species, and repeat visitors each week. As long as the feeder position and recording method remain generally consistent, these records can show seasonal changes among backyard birds more clearly.
Field observation shows how migrating birds use lakeshores, wetlands, river valleys, and ridges to move through a region. Backyard records provide a continuous timeline for one small observation point. Together, the two approaches make it easier to see when the local migration season begins, peaks, and winds down.
Conclusion
In North America, most migratory birds move north in spring and south from late summer through fall. The South generally sees spring migration earlier, while fall migration starts earlier in the North. The actual timing changes with region, species, and weather, so months are best used as broad windows.
If you want to learn which birds pass through your backyard during migration season, place the Kiwibit Bird Feeder 2 Pro at the same observation point. Reviewing visit dates, species, and visit frequency over time makes seasonal migration changes in your area easier to spot.
FAQ
1. What month do most birds migrate south?
There is no single month for fall migration in North America. Many regions see a clear peak in September and October, but some shorebirds and songbirds leave in July and August, while waterfowl, sparrows, and other late migrants may continue into November or early winter.
2. Do birds start migrating before the weather gets cold?
Yes. Departure timing for many birds is influenced by day length, the end of breeding, molt, and internal rhythms, so they may begin migrating south while local weather is still warm. Weather mainly affects the specific day they take off and where they stop.
3. Do all birds migrate at night?
No. Many small songbirds migrate largely at night, while raptors and some larger birds often use rising air currents during the day. Waterfowl and other birds may also move at different times depending on the species and weather.
4. How does weather affect bird migration timing?
Tailwinds, little rain, and relatively clear skies generally favor continued migration. Strong headwinds, thunderstorms, and persistent rain may cause birds to stop. Low clouds, fog, or light rain can sometimes push migrating birds lower and concentrate them locally.
5. How can I see which birds are migrating near me?
Combine BirdCast nighttime radar and forecasts with recent eBird sightings and regional trends, local weather, and early-morning field observation. Fixed backyard records can add a timeline for one location, but they cannot represent migration numbers across an entire region.
