Snow crabs live in cold northern waters across the Pacific and Atlantic oceans, concentrated in areas where bottom temperatures stay below 3°C. The largest populations are in the Bering Sea off Alaska, the waters around eastern Canada (especially Newfoundland, Labrador, and the Gulf of St. Lawrence), and increasingly in the Barents Sea near Norway and Russia. They prefer sandy or muddy seafloors at depths ranging from 20 to 2,000 meters, though most are found on continental shelves at less than 200 meters deep.
North Pacific: The Bering Sea
The Bering Sea between Alaska and Russia holds one of the world’s most important snow crab populations. Crabs here spread widely across the continental shelf, generally at depths under 200 meters. The population sorts itself by age and size: younger, smaller crabs tend to cluster in shallower, more northern waters, while mature adults occupy deeper areas farther south.
This population has been in serious trouble in recent years. A 2024 trawl survey showed some modest recovery, but abundance estimates remain among the four lowest ever recorded. The directed commercial fishery has been closed, with the total allowable catch set at zero for the 2024/25 season. The population is still far below the threshold needed to reopen fishing.
North Atlantic: Eastern Canada and Greenland
Canada’s Atlantic coast is the other major snow crab stronghold. The fishery stretches from Newfoundland and Labrador down through the Gulf of St. Lawrence, and it has historically been one of the most valuable in the country. Greenland also supports a commercial fishery, with slightly different size regulations for harvested crabs. In both regions, snow crabs occupy the same type of cold, muddy bottom habitat they favor in the Pacific, and the fisheries use baited pots to bring them up.
The Barents Sea: A New Frontier
Snow crabs began appearing in the Barents Sea, between Norway and Russia, in the late 1990s. Scientists believe they arrived from populations farther east in the Arctic, and the conditions turned out to be ideal: cold bottom water, plenty of food on the seafloor. Norway launched a commercial snow crab fishery in 2012, and the population is projected to keep spreading north and west toward the Svalbard Islands as conditions remain favorable. This expansion has made the Barents Sea one of the newest and fastest-growing snow crab fishing grounds in the world.
What Makes a Good Snow Crab Habitat
Temperature is the single biggest factor controlling where snow crabs can survive. Adults are physiologically limited to water below 7°C. Above that threshold, their bodies burn more energy than they can take in, making survival impossible. They’re most active at around 0°C, and activity actually decreases as the water warms toward their upper limit. This is why they’re restricted to high-latitude, deep, or Arctic-influenced waters.
Beyond temperature, snow crabs need soft seafloor. Sandy and muddy bottoms are their primary habitat, where they can forage for worms, clams, small crustaceans, and other bottom-dwelling organisms. Rocky or hard substrates are far less suitable. Depth matters too, but it varies by region. While snow crabs have been found as deep as 2,000 meters, the vast majority of commercially important populations live on relatively shallow continental shelves.
How Their Location Changes With Age
Snow crabs don’t stay in one place throughout their lives. Juveniles settle in warmer, shallower water after hatching, wandering as they grow. Once they reach maturity, their behavior shifts. Adults undergo seasonal migrations between deeper offshore waters and shallower inshore areas. In Newfoundland, for example, mature crabs move into shallow water in spring to breed, then retreat to deeper zones afterward. This pattern means the same stretch of coastline can have very different crab densities depending on the time of year.
Climate Is Reshaping Their Range
Snow crabs depend on what oceanographers call the “cold pool,” a mass of near-freezing bottom water that forms under sea ice each winter. As ocean temperatures rise, this cold pool shrinks and shifts northward. In the Bering Sea, researchers have found that warming reduces the total area snow crabs can occupy across all life stages. Between 2018 and 2019, surveys in the northern Bering Sea recorded a roughly 600% increase in large male crabs, suggesting animals were concentrating into a shrinking band of suitable cold water rather than spreading across their historical range.
The pattern is not a simple march northward. Rather than the entire population shifting its center of distribution, the habitable area is compressing. Crabs that once spread across a broad swath of the shelf are being squeezed into smaller and smaller zones. This concentration makes them more vulnerable to disease, competition for food, and localized environmental events. It also helps explain the dramatic population crash in the Bering Sea, where billions of crabs effectively disappeared from surveys over just a few years.
In the Barents Sea, the dynamic is reversed. Warming has made previously inhospitable Arctic waters more suitable, and snow crabs are expanding into new territory. The same force that’s squeezing populations in the Bering Sea is opening doors in the European Arctic.