Eagle Diet by Season: A Year-Long Feeding Behavior Guide

Eagles do not eat the same way in January as they do in June. Across a single calendar year, a bald eagle’s menu can swing from spawning fish to waterfowl to roadkill, while a golden eagle tracks the breeding cycles of rabbits, squirrels and other prey. Understanding this seasonal rhythm is the single best predictor of where — and when — you will actually find eagles feeding.

Why eagle diets change with the calendar

Eagles are opportunists first and specialists second, as our complete guide to bald eagle diet explains. Their prey base is not static: fish migrate and spawn, waterbirds nest and fledge, rodents breed in bursts, and carrion appears and disappears with weather and hunting seasons. An eagle’s “diet” is really a rolling response to whatever the landscape is offering that week.

Seasonal shifts also shape hunting behavior itself: the prey that sits still in winter will often be actively pursued in spring. If you want the broader picture of both North American eagles, start with the ultimate guide to eagles.

Spring: fish runs and the first easy meals

Bald eagles: spawning fish and waterbird chicks

In spring, bald eagles concentrate wherever fish are moving shallow to spawn. Runs of herrings, shad, suckers and smelt in rivers draw dozens of eagles to the same riffles, and in the Pacific Northwest and Alaska, early salmon returns begin shifting the diet heavily toward fish. Because spawning fish are often distracted, injured or weakened, capture success goes up — eagles may simply wade or snatch from the surface rather than perform dramatic stoops.

As spring turns into early summer, a second bonanza appears: the chicks of colonial waterbirds. Herons, gulls, cormorants, grebes and coots nest in dense colonies, and their flightless young are among the easiest substantial meals a breeding eagle can deliver to a nest. Studies of bald eagle diet consistently show a spike in bird prey during the nesting season, when adults must feed both themselves and rapidly growing eaglets.

Golden eagles: kits, pups and the breeding pulse

Spring works differently for golden eagles in open country. The key event is the breeding pulse of their mammal prey: jackrabbit kits and ground squirrel pups become available in numbers, and they are slow, naïve and above ground. Research on golden eagle diet in the American West shows jackrabbits and ground squirrels can together make up the large majority of prey items in many populations, and spring is when the smallest, most vulnerable individuals appear. This is also when resident pairs are incubating or feeding young, so hunting intensity peaks precisely when prey is most catchable.

Summer: easy prey and hungry nestlings

Bald eagles: demand at the nest

Summer is the season of maximum demand. A pair of growing eaglets can consume an enormous amount of food between hatching and fledging, and parents respond by taking whatever is abundant and easy: fish caught near the surface, injured or molting waterbirds, small mammals, and carrion along shorelines. In some regions, eagles also pirate from ospreys and gulls more frequently in summer, when escorting hungry chicks makes energy-efficient theft attractive. How often eagles need to deliver food is covered in our article on how often eagles eat.

Golden eagles: juveniles learning to hunt

For golden eagles, summer belongs to the young. Fledged juveniles are clumsy hunters at first, and their early diet is skewed toward whatever they can overpower with minimal skill: insects, roadkill, leftover carrion, and slow young mammals. Survival studies show the first months after fledging are the riskiest, and learning to kill reliably is the main task. You will often see juveniles perched for long stretches, making short practice attempts at ground squirrels or cottontails — with a success rate far below that of adults.

Autumn: salmon, carrion and the great dispersal

Autumn rewrites the map. In the Pacific Northwest and Alaska, concentrated salmon runs become the dominant food source for bald eagles, sometimes drawing thousands of birds to a single river — the famous congregations on salmon streams are among the largest raptor gatherings on the continent. eagles often prefer spawned-out or dead salmon over live ones, because a floating carcass requires zero pursuit.

At the same time, migration and dispersal begin. Northern bald eagles move south toward open water; golden eagle juveniles disperse from natal territories, and western populations ride thermals along mountain ridges. In open country, autumn is also the season when earlier rodent abundance collapses and eagles increasingly rely on carrion — deer gut piles from the hunting season, roadkill and livestock carcasses. Golden eagles are notorious for feeding on gut piles in November and December, which unfortunately exposes them to lead ammunition fragments, a well-documented conservation problem.

Winter: ice, dams, waterfowl and dumps

Below the dams

When northern lakes freeze, the classic winter bald eagle scene appears: dozens of eagles standing on ice below a hydroelectric dam. Dams keep water moving and unfrozen, stunned or injured fish pass through the turbines, and waterfowl concentrate in the open stretches. Eagles at these sites eat both the fish and the ducks and coots, and because the same open-water sites are used year after year, they become predictable winter viewing destinations.

Carrion and dump feeding

Winter is carrion season. Waterfowl weakened by cold, deer killed by vehicles and hunters, and winterkill animals all become available, and bald eagles — like golden eagles — take full advantage. Frozen ground and ice make live fishing inefficient, so scavenging can dominate the winter diet in northern populations. It is also when eagles turn most heavily to landfills: birds that hunt all summer will happily feed at dumps in January, alongside gulls and ravens. For a deeper dive into these fallback strategies, see our piece on what eagles eat when fish are unavailable.

Golden eagles in winter lean on cottontails and jackrabbits, which remain active above snow, plus whatever carrion the season provides. In much of the West, winter is also when golden eagles take more domestic carrion from ranch country, and the ratio of live kills to scavenged meals can shift noticeably with snow depth.

How ice cover changes everything

Ice is the single most important winter variable for bald eagles. Ice cover blocks access to fish, eliminates the shallow-water hunting that dominates the rest of the year, and concentrates both eagles and waterfowl into the remaining open water. A partially frozen reservoir can hold a handful of eagles in December and more than a hundred in February if the ice keeps spreading — until a warm spell reopens the lake and the birds scatter overnight.

The same mechanism works in reverse during thaw. Ice-out in early spring briefly traps and stuns fish along shorelines, creating short-lived feeding frenzies that birders plan whole trips around. In short: watch the ice, and you can often predict the eagles. The mechanics behind how eagles actually capture all this prey are covered in our guide to the eagle food chain and hunting behavior.

A season-by-season viewing calendar

The table below condenses the year into a practical field guide. Treat it as a template — exact timing shifts by two to four weeks between the Deep South and Canada, and local salmon or rodent cycles can override the pattern entirely.

Month-by-month implications for viewers

Translated into practical terms: January–February is dam season — dress warm and stake out open water below dams, at power plant outfalls and along coasts. March–April rewards river watchers as fish runs peak, and ice-out frenzies can appear at any reservoir. May–June means active nests; feeding flights are frequent and predictable once you locate a nest territory. July–August brings fledged juveniles, often visible loafing and practicing near water or squirrel colonies. September–October is for salmon streams and ridge watchsites, where migration counts peak. November–December shifts attention back to carrion sources — roadkill corridors, gut-pile areas (view respectfully and from a distance) and the first ice forming on big lakes.

One caution applies year-round: a feeding eagle is a vulnerable eagle. Keep your distance from carcasses and nest trees, since pushing a bird off its food or its young costs real energy in winter and real survival odds in spring.

Frequently asked questions

Do bald eagles really eat mostly fish?

On an annual average, yes — fish typically make up the largest share of bald eagle diet, often well over half in most populations. But the composition swings dramatically by season, and in winter, carrion and waterfowl can locally exceed fish. The opportunism is the constant; the menu is not.

Why do eagles gather at dams in winter?

Dams keep water flowing and unfrozen, and turbines stun or kill fish that eagles easily pick up downstream. Waterfowl also concentrate in the open water, providing a second food source. The result is a reliable, predictable winter cafeteria that birds return to year after year.

What do golden eagles eat when jackrabbits decline?

They shift toward cottontails, ground squirrels, other medium mammals, and substantial carrion including deer carcasses and livestock remains. In bad prey years, diet breadth widens considerably, and scavenging becomes more important. Rabbit cycles strongly influence golden eagle breeding success from year to year.

Is it normal to see an eagle at a landfill?

Yes, especially in winter and especially for bald eagles in northern regions. Landfills offer high-calorie scavenged food with zero pursuit cost when live prey is locked under ice. It looks undignified, but it is a well-documented and energetically sensible survival strategy.