The question I get most often about Alaska wildlife is “when should I go?” And the honest answer is: it depends entirely on what you want to see. Alaska’s wildlife calendar runs like a series of overlapping seasons within a season — bears at Brooks Falls peak in July and again in September; humpbacks arrive in Southeast Alaska in late April and stay through October; the salmon runs are staggered by species across the whole summer. Miss the timing by three weeks and you can still have an extraordinary trip, just a different one.
This is the calendar I would have wanted before my first Alaska wildlife trip — specific enough to actually plan around.
What Wildlife Is Active in Alaska in May?
May is an underrated month. The crowds are thin, prices have not hit summer peaks, and a surprising amount of wildlife is moving.
Bears: Emerging from den hibernation across Alaska. Brown bears in coastal areas (Kodiak, Katmai) come out earlier than interior grizzlies. Early May around Kodiak sometimes produces bear sightings on hillsides and beaches as animals move to find food. They are hungry and active.
Humpback whales: Begin arriving in Southeast Alaska — Juneau-area feeding grounds, Frederick Sound, Glacier Bay. By mid-May, small groups are reliably present. This is genuinely good whale-watching timing with very few other tourists on the water.
Shorebirds and raptors: The Copper River Delta near Cordova hosts one of the most spectacular shorebird migrations in North America in early May — hundreds of thousands of western sandpipers and dunlins staging before their Arctic nesting push. If birds are your thing, this is a specific reason to build a Cordova stop into a May Alaska trip.
Salmon: King (Chinook) salmon begin entering some Southeast Alaska rivers in mid-May, but runs are light. Real fishing pressure starts in June.
When Is the Best Time to See Bears in Alaska?
The answer varies by bear species and location, but most visitors are asking about brown bears — specifically the famous bear viewing at Katmai and Kodiak.
Katmai National Park — Brooks Falls:
This is the benchmark Alaska bear experience. Brown bears congregate at Brooks Falls to intercept sockeye salmon climbing the falls — the bears stand at the lip of the waterfall or in the “jacuzzi” pool below and snatch fish mid-air or grab them from the water.
The timing follows the salmon run:
- Early July (July 1-20 roughly): The sockeye run peaks at Brooks Falls for the first time. Bears are at the falls in high numbers. This is the most visually dramatic period — bears at the lip, fish leaping, total chaos. The platform at Brooks Falls has limited capacity and this is the most competitive reservation window.
- Late August through mid-September: The second (and often larger) run of sockeye arrives. Bears are at Brooks Falls again and they are noticeably fatter — this pre-hibernation feeding period is called hyperphagia. Bears fish with less interruption between fish, moving with a purposeful efficiency that the July experience lacks.
Both periods are excellent. July is more chaotic and photogenic; late August-September is more intimate and the bear behavior (intensely focused, less social aggression) is fascinating in a different way.
Accessing Katmai:
Katmai is accessible only by small plane from King Salmon, a 40-minute flight from Anchorage. Most visitors do it as a day trip — fly to King Salmon, catch a floatplane to Brooks Camp, spend several hours at the falls platform, fly out. Budget $700-950/person for a guided day trip including flights.
The Brooks Camp lodge books up 1-2 years in advance for peak July dates. The platform has a 40-person capacity limit with timed entries managed through recreation.gov. Plan early.
Kodiak Island:
Kodiak brown bears are among the largest in the world — males average 800-1,000 lbs, and large males approach 1,500 lbs. Viewing is via charter float-plane from Kodiak town to remote river systems. Peak timing tracks the salmon runs: late July through September for the best riverside viewing.
Kodiak is less famous than Katmai and correspondingly less crowded. The guided day-trip experience is similar in logistics — floatplane, remote river, bears and salmon — but the bear body size is on another level.
When Do Whales Arrive in Alaska?
Humpback whales:
Alaska is one of the best humpback whale destinations on Earth, and the Juneau/Frederick Sound area is the most accessible. Humpbacks arrive in Southeast Alaska in April and May following the herring and euphausiid blooms. Peak numbers are in July and August, with good viewing continuing into October.
The behavior you are hoping to see: bubble-net feeding. Groups of humpbacks cooperate to herd fish into a column using rising nets of bubbles, then lunge through the bait ball together. This is visible from whale-watching boats in Frederick Sound (out of Petersburg or Juneau), in Glacier Bay, and around the Kenai Peninsula. It is one of the most extraordinary wildlife behaviors in the world and Alaska is one of the few places it happens predictably.
Orcas:
Resident orcas (fish-eating, traveling in family pods) are present in Kenai Fjords and Prince William Sound throughout summer, with highest sightings probability in June-August. The full-day Kenai Fjords tours frequently encounter orcas — they are a consistent enough sighting that guides consider it a normal summer day, not a lucky one.
Transient orcas (mammal-eating, in smaller groups) are less predictable but sometimes seen in the same waters.
Beluga whales:
Cook Inlet beluga whales are critically endangered — only a few hundred remain — but they are visible seasonally from Anchorage’s Beluga Point viewpoint on the Seward Highway, typically in summer when they follow salmon up the inlet. This is a remarkable thing to be able to see from a roadside pullout 30 miles from a major American city.
Gray whales:
Passing through on their spring migration (April-May) along Alaska’s Pacific coast. Nome and the Seward Peninsula see them in May. Not a primary draw for most Alaska wildlife trips but notable if you are already in those areas.
When Do Alaska Salmon Runs Happen?
The salmon runs are the engine that drives the entire Alaska wildlife ecology — bears, eagles, orcas, and wolves all organize their movements around the fish. Understanding the run timing explains most of the state’s wildlife calendar.
Alaska has five Pacific salmon species, each with distinct run timing:
King (Chinook) salmon: The largest and most coveted. Early June arrivals in many Southeast Alaska rivers; Kenai River kings run June through mid-July. The Kenai King is famous for its size. Homer’s Anchor River and Deep Creek see king runs in mid-May to late June.
Sockeye (Red) salmon: The Katmai species. Largest runs in late June through August, with the Brooks Falls peak around July 4-20 and a second run in late August. The Kenai and Russian Rivers see massive sockeye runs in July — these are the rivers where combat fishing (shoulder-to-shoulder bank anglers) happens. Dramatic, chaotic, uniquely Alaskan.
Silver (Coho) salmon: Run August through October in most systems. Excellent sport fish and good timing for late-summer visitors. Seward-area streams and Homer’s streams get good coho runs in August-September.
Pink salmon: Largest biomass of any Pacific salmon run. Even-year runs are typically larger than odd years. Pink salmon often stack in such numbers that small coastal streams turn pink-silver with fish. August is peak pink season in many Southeast Alaska streams.
Chum salmon: Run July through September. Not as prized by sport fishers but highly important to bears (particularly interior Alaska grizzlies) and eagles. Nome-area rivers have notable chum runs.
What Alaska Wildlife Should You Expect at Each Major Destination?
Denali National Park (June-September): Grizzly bears are the signature species, viewed from park buses. The no-private-vehicle policy means bears behave naturally near the road. Dall sheep on alpine slopes, moose in willow thickets, caribou herds crossing the tundra, wolves (less predictable but present), golden eagles. Read the Denali National Park guide for full details on the bus system.
Kenai Fjords National Park (May-September): Humpback whales, orcas (resident and transient), Steller sea lions, harbor seals, tufted puffins, horned puffins, murres, and tidewater glacier calving. The full-day tours reach the outer fjords where whale density is highest.
Glacier Bay (May-September): Humpback whales, harbor porpoises, brown and black bears on beaches, mountain goats on high slopes, wolves occasionally, eagles at fish streams. The park limits cruise ship entries, keeping wildlife less habituated to human activity than some other areas.
Katmai National Park (July-October): Brown bears at Brooks Falls. Period. This is the most concentrated, predictable bear-viewing experience in the world. Nothing else in Alaska approaches it for pure bear density.
Homer / Kachemak Bay (April-October): Halibut, king crab, and salmon fishing; sea otter rafts in the bay (among the densest on Earth); black bears on the bluff trails in early summer; shorebird migration at Beluga Slough; eagles perched on harbor pilings year-round. Homer is a wildlife-rich destination that doesn’t get enough credit outside fishing circles.
Sitka (May-September): Sea otters (Sitka Sound has high densities), humpbacks in the outer islands, brown bears on Kruzof Island and the surrounding Tongass National Forest, spectacular seabird colonies at St. Lazaria Island National Wildlife Refuge.
What Wildlife Safety Rules Matter Most in Alaska?
Two rules that apply regardless of where you are in Alaska:
Bear safety: Carry bear spray and know how to use it. Make noise in dense vegetation. Never run from a bear — stand your ground, deploy spray if it charges within 60 feet. In the backcountry, hang food or use a bear canister. Most of Alaska’s bear encounters are non-confrontational; the bears that are problems are usually bears that have been conditioned to human food.
Do not get between a moose and her calves. Moose are responsible for more wildlife-related injuries in Alaska than bears. A cow moose with calves in May and June is one of the more dangerous animals in the state — she will charge without warning at what she perceives as a threat. Give moose significant space, especially around Anchorage parks and trails where moose-human proximity is high.
Build your Alaska wildlife trip with the AI Trip Planner. Related destination guides: Katmai National Park | Kenai Fjords | Homer | Denali National Park | Kodiak
Also see: Alaska in Summer: A First-Timer’s Week Under the Midnight Sun | Glacier Viewing in Alaska: Boat, Flightseeing, or Hike