Spring Bird Migration in Alaska: When It Happens, What to Watch, and Where to Go

Every spring, something extraordinary unfolds across Alaska’s skies, coastlines, and wetlands — a living river of wings that rivals any wildlife spectacle on the planet. Nearly 500 bird species populate or pass through the Great Land, many of them converging in a dramatic seasonal rush that transforms the state from a frozen wilderness into one of the world’s premier birding destinations.

Whether you’re a lifelong birder or simply someone who loves watching nature come alive, Alaska’s spring migration delivers. From millions of shorebirds descending on tidal mudflats to rare Asian species blown in from across the Bering Sea, the diversity and sheer scale of what moves through this state each spring is nothing short of breathtaking.

This guide walks you through everything you need to know about spring bird migration in Alaska — when it peaks, which flyways funnel birds through, which species to look for, and exactly where and how to witness it all firsthand.

Pro Tip: Alaska’s spring migration window is short and intense. Planning your visit around late April through mid-May gives you the best overlap between arriving shorebirds, waterfowl, and early songbirds.

When Does Spring Bird Migration Happen in Alaska?

Spring migration brings millions of birds north, ready to take advantage of the long summer days to mate and raise their young while food is plentiful. April, May, and June are the best months to see these travelers passing through or laying claim to summer territories.

The season doesn’t arrive all at once, though. It unfolds in waves, with different species groups leading the charge at different times. The Inside Passage in Southeast Alaska is typically the first region to welcome migrants, with activity building through April. Millions of waterfowl and shorebirds return to the Stikine River Flats, Copper River Delta, and other wetlands in April. As spring progresses, the migration north intensifies.

In May, migratory songbirds begin to arrive and seabirds start to gather at southcentral nesting colonies. By early June, the last wave of migrants — including many rare Asian accidentals — arrives in western Alaska. June is the best month to spot unusual birds such as Asian accidentals in western Alaska.

Here’s a simple breakdown of the migration timeline by region:

Generally speaking, the best time to bird in Alaska is from late April until mid-September. But if you want to catch spring migration at its most electric, lock in late April through the first two weeks of May.

Which Flyway Runs Through Alaska?

Alaska doesn’t sit on just one flyway — it’s the launching point for several. Alaska birds migrate to six continents, following several different flyways. For many species, Alaska is the beginning point for flyways they will use their entire lives.

The primary corridor funneling birds into Alaska from the south is the Pacific Flyway. The Pacific Flyway is a north–south flyway for birds migrating from breeding grounds in Alaska and Canada to their overwintering areas in South America, some species travelling as far south as Patagonia. The Pacific Americas Flyway, spanning from Alaska to the tip of South America, supports millions of migratory birds. Western Sandpiper, Pacific Loon, Pacific Brant, and hundreds of other species follow this general north-south route in spring and fall.

But Alaska’s position at the crossroads of the globe means some species use entirely different international corridors. The Bar-tailed Godwit, Pacific Golden-Plover, and Bristle-thighed Curlew, among others, take a different route and travel the West Pacific and East Asian-Australasian Flyways. These journeys take them across vast stretches of the Pacific Ocean.

Not all Alaska-breeding birds head west or south via the Pacific, either. Some breeding birds, such as Sandhill Crane, Lesser Scaup, and Greater White-fronted Goose, migrate further to the east along the Central or Mississippi Flyways. This remarkable geographic diversity is part of what makes Alaska such a pivotal place in global bird conservation.

Key Insight: Alaska is often called the “headwaters of the flyways” because so many of the world’s migratory routes originate here. Birds nesting in Alaska pass through virtually every U.S. state — and even Hawaii — on their journeys.

You can explore more about some of the remarkable species that use these corridors, including the record-breaking fastest birds on the planet, many of which are long-distance migrants that pass through Alaska each spring.

Which Birds Migrate Through Alaska in Spring?

From the Arctic pack ice to the rainforests of Southeast to the windswept Aleutian Islands, nearly 500 bird species populate or pass through the Great Land seeking breeding, overwintering, resting, and refueling sites. Wading birds, shorebirds, and waterfowl rely on Alaska’s vast wetlands, lakes, and rivers, as well as its more than 40,000 miles of coastline. Migratory and resident songbirds, woodpeckers, and raptors seek shelter in its expansive forests.

Here are some of the most notable groups and species to watch for:

• Shorebirds: Western Sandpipers and Dunlins arrive by the millions at coastal mudflats. The Bar-tailed Godwit completes one of the longest nonstop flights of any bird on Earth to reach Alaska’s breeding grounds.
• Waterfowl: Tundra Swans, Canada Geese, Northern Pintails, Greater Scaup, and multiple duck species flood Alaska’s wetlands beginning in April.
• Seabirds: Seabirds like cormorants, murres, auklets, kittiwakes, and the clownish, colorful puffin nest in sheer cliffside colonies along Alaska’s southern and western coastline.
• Songbirds: Warblers, sparrows, thrushes, and flycatchers push through in May, with species like the American Redstart, Northern Waterthrush, and Warbling Vireo arriving in Southeast Alaska.
• Raptors: Golden Eagles, Bald Eagles, and Peregrine Falcons return to their nesting territories. You can learn more about one of the most iconic Alaskan raptors in this profile of the Merlin bird.
• Cranes: Sandhill Cranes are a beloved spring sight across Interior Alaska, arriving in flocks that fill the sky with bugling calls.
• Asian Accidentals: Exotic Asian “strays” that wander off course often wind up in Alaska and onto the life lists of delighted bird watchers. Nome and Gambell are the top spots to find these rarities.

Vast colonies of seabirds — an estimated 3 million — nest on the Pribilof Islands, including thick-billed murres, common murres, least auklets, parakeet auklets, horned puffins, tufted puffins, black-legged kittiwakes, and most of the world’s population of red-legged kittiwakes. Over 220 species of birds have been sighted on the islands, migrating from as far away as Siberia and Argentina.

Curious about the sheer size of some of Alaska’s avian visitors? Check out this rundown of the largest birds in North America, several of which breed or stage in Alaska each spring.

What Triggers Migration and How Birds Navigate in Alaska?

One of the most fascinating questions in all of natural science is this: how do birds know when to leave, where to go, and how to get there — often across thousands of miles of open ocean? The answer involves a remarkable combination of biological programming and environmental cues.

What triggers the journey north? The primary driver is photoperiod — the increasing length of daylight as winter wanes. As days grow longer, a hormonal cascade is triggered in migratory birds, stimulating fat deposition (their fuel for flight), gonad development, and a state of migratory restlessness called Zugunruhe. Temperature warming and food availability play supporting roles, but it’s the light cue that sets the clock in motion.

Migration patterns are synchronized with weather conditions, peak food availability, and nesting site proximity. In Alaska specifically, the timing of ice breakup is a critical local trigger. As the ice begins to break up in spring, migration begins. For Nome and the Bering Sea coast, the retreating ice edge essentially opens the door for millions of birds.

How do they navigate? Birds use a sophisticated, multi-layered navigation toolkit:

1. Magnetic compass: Specialized cells in birds’ eyes and beaks allow them to detect Earth’s magnetic field, giving them a built-in compass that works even on overcast nights.
2. Star navigation: Nocturnally migrating birds use star patterns — especially the North Star — to orient themselves during nighttime flights.
3. Sun compass: Daytime migrants track the sun’s position and compensate for its movement across the sky using their internal circadian clock.
4. Landmark memory: Experienced adults remember coastlines, mountain ranges, river valleys, and other geographic features from previous migrations.
5. Wind exploitation: Millions of tiny songbirds migrate thousands of miles using elliptical routes that take advantage of prevailing wind patterns to save calories.

Key Insight: The Bar-tailed Godwit holds the record for the longest nonstop bird migration — flying up to 7,000 miles nonstop from Alaska to New Zealand without landing. It fuels this feat by doubling its body weight in fat before departure and even shrinking its digestive organs to save weight.

For a deeper look at how some of the world’s most incredible fliers are built for these feats, explore this article on the frigatebird, another remarkable long-distance aerial specialist.

Best Spots to Watch Spring Bird Migration in Alaska

In compiling the top birding locations, experts considered scores of locations from the Copper River Delta where millions of migrating shorebirds congregate in spring to Alaska’s northernmost city of Barrow and its small but prized selection of birds. Here are the standout destinations you should have on your radar:

Copper River Delta (Cordova)

Every year, millions of shorebirds migrate from South America into Alaska where they stop to rest and feed on the Copper River Delta mud flats at Hartney Bay. Located about 5 miles south of Cordova near the end of Whitshed Road, the mudflats are host to thousands of Western Sandpiper during high tide during the first several days of May each year. Additionally, the Copper River Delta near Alaganik Slough is an excellent location to find migrating shorebirds. The annual Copper River Delta Shorebird Festival, held the first weekend in May, celebrates this spectacle with guided outings and expert-led programs.

Homer and Kachemak Bay

After the Cordova festival, head to Homer the following weekend for the Kachemak Bay Shorebird Festival — Alaska’s largest wildlife viewing festival — to view over 20 species of shorebirds as they return to the area’s tidal flats. Homer’s location at the tip of the Kenai Peninsula makes it a natural funnel for southcentral Alaska migration.

Potter Marsh and Anchorage Coastal Wildlife Refuge

This 564-acre freshwater marsh stretches along the Seward Highway for nearly two miles, forming a wetland maze between Turnagain Arm and the foot of the Chugach Mountains. At least 130 species of migratory and nesting birds converge on the marsh’s network of ponds and channels, often only yards from a handsome 1,550-foot boardwalk extending deep into the habitat. Notable species include bald eagles, Canada geese, Arctic terns, trumpeter swans, red-necked grebes, northern pintails, canvasback ducks, and northern harriers.

Nome and the Seward Peninsula

Nome is becoming well-known as a treasure for birders. The city is bounded by tundra on three sides and the Bering Sea coast on the other. Once the ice begins to break up, migration begins. Virtually the entire area of the Seward Peninsula accessible by road from Nome is comprised of extremely valuable nesting areas for many bird species, including most North American waterfowl. Nome is also your best bet for spotting Asian accidentals — Siberia is close, which means you might see species that aren’t normally found in the U.S., even in Alaska.

Denali National Park

Birdlife in Denali National Park and Preserve includes migratory birds from all over the world and a hardy group of residents. The abundance varies by season with a significant increase in spring as migrants return to Denali. Summer birding allows visitors to view these migratory species in a spectacular northern environment. Of the 167 species of birds recorded in Denali, 149 occur regularly and 119 are believed to nest there.

Juneau: Mendenhall Wetlands and Point Bridget State Park

The Mendenhall Wetlands State Game Refuge provides some of the best and most accessible birding habitats in all of Juneau. Another hotspot for viewing Alaska’s great spring bird migration is at Point Bridget State Park, specifically along the salmon-rich streams of Cowee Creek. The forelands near Mendenhall Glacier, made up of small lakes, dense shrubs and trees, are home to the American Redstart, Northern Waterthrush, Vaux’s Swift, Gray-cheeked Thrush, and Warbling Vireo.

Ketchikan and the Inside Passage

Spring marks an influx of migratory birds to Alaska, intent on reaching their summer breeding grounds. The first region to welcome them is the Inside Passage, where birders can delight in a spring experience that brings you up close and personal with thousands of migrating birds. Ketchikan hosts the Alaska Hummingbird Festival throughout the entire month of April.

Pro Tip: If you’re birding multiple Alaska regions in one spring trip, extending your spring birding in Alaska another week to ten days and heading north to the Southcentral region allows you to catch both the Inside Passage and Copper River Delta peak windows in a single journey.

How to Track Spring Migration in Alaska in Real Time

You don’t have to be standing in a marsh to follow Alaska’s spring migration — today’s digital tools bring the action right to your screen, and they make planning your birding outings dramatically more effective.

eBird (Cornell Lab of Ornithology)
You can access bird species migration maps through interactive platforms like eBird’s migration dashboard and BirdCast’s real-time forecasts. These tools use GPS tracking data, weather radar, and citizen science observations to map migration patterns across North America’s four major flyways. On eBird, you can filter sightings by species, location, and date — making it easy to see what’s been spotted near your target hotspot in real time. Once enrolled in the Wings Over Alaska program, birders are encouraged to share their sightings on eBird.org.

BirdCast
BirdCast delivers three-day migration forecasts using 23 years of weather radar data and machine learning algorithms. You’ll receive real-time updates every six hours, tracking migration intensity measured in birds per kilometer per hour. This is especially useful for planning early morning outings — migration often peaks just after sunrise following overnight flights.

Wings Over Alaska (Alaska Department of Fish and Game)
Wings Over Alaska is a free program administered by the Alaska Department of Fish and Game. It recognizes birders who have successfully spotted certain species of birds in Alaska (471 species have been identified to date). Use the site to download checklists, brochures, applications, and more.

Merlin Bird ID App
The Cornell Lab’s Merlin app uses sound ID technology to identify birds by their calls in real time — a game-changer for picking out warblers and sparrows in dense vegetation. It’s a must-have tool for Alaska birding, where species diversity can be overwhelming. You can also read more about the Merlin bird itself, one of Alaska’s resident falcons.

Local Birding Groups and Festivals
Many Alaska communities host birding festivals to celebrate their migratory visitors, or you can take a guided tour with a professional guide who will help you identify rare species to add to your birding bucket list. Festival organizers often post real-time sighting reports on social media and their websites throughout the event weekend.

Important Note: Alaska’s weather can change dramatically and quickly, especially in coastal and western regions. Always check forecasts before heading out, and dress in layers — even in May, temperatures near Nome or on the Copper River Delta can dip well below freezing.

How to Make Your Yard Migration-Friendly in Alaska

You don’t need to travel to Cordova or Nome to experience Alaska’s spring migration. With a few thoughtful additions to your yard or outdoor space, you can turn your property into a welcoming stopover for tired migrants — and enjoy front-row seats to the action from your own window.

Provide the Right Food
Fueling up is the top priority for migrating birds. Offer a variety of food sources to attract the widest range of species:

• Black-oil sunflower seeds — the universal crowd-pleaser, attracting finches, sparrows, chickadees, and more
• Suet cakes — high-fat energy for insect-eating migrants like warblers and woodpeckers
• Nyjer (thistle) seed — irresistible to redpolls, Pine Siskins, and goldfinches
• Fruit and nectar — essential for Rufous Hummingbirds, which arrive in Southeast Alaska as early as April

Explore the wide variety of different types of bird feeders to find the right setup for the species you want to attract. Matching feeder style to food type makes a significant difference in what shows up in your yard. You can also learn more about what birds eat to survive to better understand which offerings will draw the most migrants.

Add Fresh Water
A reliable source of clean, moving water is often more attractive to migrants than food. A simple birdbath with a dripper or small recirculating pump creates sound and movement that birds detect from a distance. During cold spring mornings in Alaska, a heated birdbath prevents freezing and keeps water accessible when birds need it most.

Plant Native Vegetation
Native shrubs and trees serve double duty: they provide natural food in the form of berries, seeds, and insects, and they offer critical shelter for small migrants resting between flights. In Alaska, consider adding native species like:
— High-bush cranberry (Viburnum edule)
— Elderberry (Sambucus racemosa)
— Sitka alder (Alnus viridis)
— Wild rose (Rosa acicularis)

Reduce Window Strike Risk
Window collisions kill an estimated 600 million birds annually in North America. During migration, when birds are moving through unfamiliar territory, the risk spikes. Apply window decals, UV-reflective tape, or exterior screens to your largest panes — especially those that reflect sky or vegetation.

Keep Cats Indoors During Migration
Outdoor and free-roaming cats are the single largest human-caused source of bird mortality in North America. During spring migration, exhausted birds resting at ground level are especially vulnerable. Keeping cats inside during the April–June migration window is one of the most impactful things you can do for local bird populations.

Pro Tip: Turn off or dim exterior lights at night during peak migration weeks. Artificial light at night disorients migrating birds, causing them to circle lit structures until they collapse from exhaustion. Lights-out programs during migration are a simple, high-impact conservation action.

If you’re new to backyard birding and want to learn more about the birds you’re attracting, check out this helpful guide to birds by name and explore resources like types of blue birds to help identify the species visiting your feeders. Spring in Alaska brings a remarkable variety of visitors — and with the right setup, many of them will make your yard a regular stop on their northward journey.

Alaska’s spring bird migration is one of the natural world’s most awe-inspiring events. Whether you’re scanning the Copper River Delta mudflats for Western Sandpipers, listening for warblers in the Mendenhall Wetlands, or simply watching a Rufous Hummingbird visit your backyard feeder in Ketchikan, you’re witnessing a phenomenon that connects Alaska to every corner of the globe. Get outside, look up, and let the migration season unfold around you.