Taxonomy

Rarity

Abundance rates how many are in suitable habitat. Find difficulty rates how hard it is to locate one on a daylight snorkel or freedive through 50 ft. A higher find score means a harder search. The rarity category also reflects the kind of encounter; it is not an average of the 2 scores.

Regulations

CDFW rules verified 2026-10-12

Seasonality

Edibility

Location

The red rock crab ranges from Kodiak Island, Alaska south to Isla San Martin in Baja California, Mexico. It lives from the low intertidal zone to about 300 feet, in coastal water and in bays. Ken Jones describes it as a crab of rocky ground, including reefs, boulder beaches and gravel beds, and writes that it cannot live on mud or pure sand. The Walla Walla University guide to the invertebrates of the Pacific Northwest finds it on both rock and soft bottom, most commonly around rocks, often half-buried in the sand under a rock during the day.

In Southern California the species sits deeper than its relatives. The 1970s trap surveys caught the most red rock crabs between about 180 and 240 feet. At an offshore oil platform, red rock crabs were found at the same density on the platform as on the surrounding bottom, while yellow rock crabs crowded onto the structure.

Harvest Brief

California sets a limit of 35 per person per day under the rule that covers all the rock crabs, with a minimum size of 4 inches. The shell is measured straight across at its widest point. Humboldt Bay is the only exception, with no minimum size. The season is open all year. A crab can be brought up to be measured, but an undersize crab cannot be kept and must be released right away. Divers may take crabs only by hand and may not carry a hooked tool while diving. Hoop nets are legal statewide, with a limit of 5 per person, or 10 per boat, south of Point Arguello in Santa Barbara County. Crab traps are legal only north of Point Arguello and require a Recreational Crab Trap Validation. Take of all invertebrates is prohibited inside state marine reserves.

The rules change at the state line. Oregon allows 24 red rock crabs of any size or sex and closes ocean waters to crabbing from October 16 to November 30, while bays, beaches, piers and jetties stay open all year. Washington allows 6 a day of either sex, with a 5-inch minimum, and the crab must be in hardshell condition. Puget Sound seasons are set each year, and Marine Area 12 south of Ayock Point and Marine Area 13 are closed to crab harvest in 2026.

The find rates a 3 on the 1 to 5 scale. The crab is common in the north, but it spends the day half-buried under rocks and comes out more at night. Rocky ground also makes hoop nets and snares hard to use, so anglers on the central and northern coast meet it often without targeting it. The red rock crab is told apart by its brick-red shell and the 5 nearly equal points between its eyes. Like the other rock crabs, it has black-tipped claws, which separate it from a Dungeness crab.

Deep Dive

The red rock crab is the largest of the 3. The Walla Walla guide gives a shell width of up to about 8 inches in males and 6.7 inches in females, though Washington's Department of Fish and Wildlife notes that most are under 6 inches. The adult shell is brick red on top, with a yellowish white underside blotched with orange-red. Young crabs look nothing like the adults. They are often white, or striped red and white.

Growth is fast at first. Young crabs reach 0.2 to 0.6 inch across by the end of their first summer and 2.4 to 3.7 inches by age 2. Females mature at about 2.6 inches, between 1 and 2 years old. Researchers estimate a maximum life span of 5 to 7 years.

Mating takes place in summer, after the female molts. A male will often hold a female that is preparing to molt underneath him, and he mates with her once she has shed her shell and the new one is still soft. The eggs take about 120 days to develop, and the larvae spend about 95 days in the plankton. In Washington's inland waters, females carrying eggs are most common from October to January.

It eats almost anything. The Walla Walla guide lists barnacles, smaller crabs, sea cucumbers, marine worms, small shrimp-like crustaceans and many other shore animals, along with dead fish, and counts at least 42 prey species. The crab is a threat to commercial oyster beds. Its claws respond to its diet: crabs raised on thick-shelled mussels developed even stronger claws. Ken Jones reports that the invasive European green crab appears to be a favorite food. Young red rock crabs are eaten by sand bass, kelp bass and sculpins, and by seabirds such as gulls and pigeon guillemots. Reported predators of adults include octopuses, sea otters and bottom-feeding sharks.

It is a good crab to eat. Washington's Department of Fish and Wildlife calls the meat very tasty despite the crab being less meaty than a Dungeness crab, and Ken Jones describes it as slightly sweet and delicate, with almost all the meat in the claws and legs. Rock crabs are usually cooked whole and cracked, or broken up and cooked in a sauce or broth. Like the other rock crabs, it can build up domoic acid, a nerve toxin from a plankton bloom, and California's commercial fishery closes when levels pass the federal limit for human food.

Where to Find Them

Researched habitat and range candidates

These locations have suitable habitat within the species range. An assignment is a possible encounter, not a confirmed sighting at every beach. Season, depth, and local conditions still matter. Historical habitat without present-day evidence is excluded.