Costco's 5 Best Cuts Of Fish By Far

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Costco's seafood section can seem overwhelming if you dare enter the warehouse without a plan. Depending on location, you could find anything from enormous fresh fillets to resealable freezer bags filled with unexpected fish finds from across the globe. But when buying several pounds at a time, which is normal in the wide world of Costco shopping, you could end up with a fridge full of seafood that doesn't fit your fancy. 

Fortunately, a few Costco cuts of fish stand out for high quality, fresh flavor, convenience, and versatility, earning impressive overall customer approval. For this list, we're focusing on current Costco fish finds. Whether fresh or frozen, each offers something a little different from the other. We also considered Costco member ratings and discussions among shoppers. Those individual comments are naturally subjective, but they provide some useful real-world perspective on which products people return to over and over again. 

The results range from boldly flavored wild sockeye salmon to mild tilapia that shines with almost any seasoning you toss its way. Whether looking for an easy weeknight dinner, grill-worthy fish for sizzling, or a fresh fillet impressive enough for company, following are five Costco options that deserve a closer look.

Prices reflect the date of publication and may vary based on region.

If you're seeking a single fish to keep the freezer stocked year-round, Kirkland Signature Wild Alaskan Sockeye Salmon is a solid place to start. Costco sells 3-pound resealable bags containing boneless, skin-on portions that weigh about 5 to 7 ounces each. They're individually vacuum-packed and quick frozen, so you can pull out the amount you need instead of defrosting an entire side of salmon. 

Spending most of my days on a tiny boat-access-only island off the coast of Seattle, I'm pretty chummy with the local salmon population. That's why I'm admittedly picky about the deep flavors and firm texture inherent in genuinely fresh, wild-caught, sockeye salmon. These fillets from Costco rise to the occasion, providing easy access to the real deal regardless of the season. The skin-on portions are particularly convenient for folks who love a crisp exterior and robust sea-forward flavor. They can be pan-seared, roasted, grilled, or cooked in an air fryer. Sockeye in general came in second on our ranked list of six salmon types.

Customers overall seem to appreciate the quality and convenience, doling out a collective 4.3 out of 5 stars from 82 reviews on Costco's frozen sockeye product page. In a 2025 Costco Reddit discussion, shoppers repeatedly praised both the flavor and individual packaging. One commenter noted that the portions make it especially easy to cook for two rather than tackling an oversized fillet.

Purchase the Kirkland Signature Wild Alaskan Sockeye Salmon in a 3-pound bag for about $43.

Cod is the counterpoint to sockeye on this list: mild, uncomplicated, and adaptable on so many levels. Costco's Kirkland Signature Wild Alaskan Pacific Cod comes in a 2-pound package of wild-caught cod loins. The pieces are hand-trimmed, boneless, and skinless, with individual portions weighing roughly 5 to 8 ounces. 

That mildness is one of cod's most-loved features, especially for anyone preferring a less "fishy" persona on their plate. Whether lightly fried, baked, or seared in a hot, sizzling pan, these moist, flaky cod loins thrive in citrusy sauces, fresh-herb preparations, blackened for fish tacos, or sautéed Mediterranean-style with lemon, garlic, and olive oil. It also works for a crispy breaded fillet in comfort foods like fish n' chips. 

These cod loins have some remarkably devoted Costco shoppers. In a June 2026 Reddit discussion started by a customer whose warehouse had stopped the product, the poster described Kirkland's wild cod as a longtime household staple, appealing for its return. A separate July 2026 Reddit discussion about Costco's frozen seafood included customers naming Pacific cod among the fish they regularly buy, with one simply responding, "Cod all the time." Availability can vary by warehouse, but if yours stocks it, this is a solid choice for a mild fish with plenty of dining potential. This product came in third on our ranked list of Costco frozen seafood staples.

Purchase Kirkland Signature Wild Alaskan Pacific Cod in a 2-pound package for about $43. 

Mahi-mahi earns a spot among the best fish cuts partially because its firm structure accommodates two important things: outdoor or indoor grilling, and the bold seasonings that complement its natural flavor. It also remains, in essence, a mild fish that doesn't overpower the plate. Costco's version, the Kirkland Signature Wild Pacific Mahi-Mahi, comes in a 3-pound package of boneless, skinless, center-cut portions weighing roughly 4 to 8 ounces each.

The pieces are individually vacuum-packed and quick frozen to seal in flavor, releasing it just in time for that seafood dinner you're craving. The flaky texture and moistness of mahi-mahi fish makes it versatile enough for absorbing aromatic herbs and spice rubs, earthy Cajun seasonings, or the bold flavors of blackened fish. Mahi-mahi is well known for starring in many recipe versions of fish tacos. In fact, Costco customers show plenty of enthusiasm for using this wild Pacific cod in that way.

In one Reddit discussion asking shoppers to name Costco's best frozen fish for the money, a customer says the mahi-mahi goes into tacos with mango salsa at their house about once a week, while another calls it the best frozen fish available in their area. A separate Reddit Costco discussion expands the scope a bit. Shopper recommendations included using the frozen mahi-mahi for grilling, blackening, breading, air-frying, and making fish tacos.

Purchase the Kirkland Signature Wild Pacific Mahi-Mahi in a 3-pound bag for about $43.

Not every fish on this Costco list comes out of the freezer section. The Kirkland Signature Fresh Farmed Steelhead Fillet is large and ready to portion. You can cook it in any way you like, whether that involves your favorite time-tested techniques or newbie experimental recipes. Since it's a fresh offering, details can vary with regional inventory. However, you can generally expect boneless and skinless fresh fillets sold in packages averaging about 3 pounds or less. The large portion is especially handy when feeding several folks for dinner — or popping into your freezer for future meals.

Though very similar to salmon in appearance, steelhead is actually a trout fish. Its relatively mild flavor makes it adaptable to many of the same recipes as salmon. Many chefs, both professional and home-kitchen devotees, praise steelhead for its preparation and cooking versatility. The fish is suitable for pan-searing, roasting, curing, smoking, and grilling. Costco shoppers appear to be particularly enthusiastic about these steelhead fillets, often comparing them to salmon.

In one Reddit discussion about Costco steelhead, someone who cooked the whole fresh fillets more than once said, "If I ordered salmon at a restaurant and they brought me steelhead, I wouldn't know the difference." Other discussions bring comments about how the steelhead is excellent for grilling and smoking, with one customer noting how it takes a hotter smoke than salmon without drying out.

Purchase the Kirkland Signature Fresh Farmed Steelhead Fillet for about $12.50 per pound.

Kirkland Signature Tilapia Loinscome in a 3-pound resealable bag of farm-raised, boneless and skinless tilapia in individually vacuum-packed and quick frozen portions. The fish has no added preservatives or additives and is Aquaculture Stewardship Council (ASC) certified. For devotees of sustainability, the certification basically verifies that it meets ASC standards for things like environmental responsibility, animal welfare, working conditions, farm management, and more.

Tilapia doesn't necessarily carry the prestigious reputation of wild sockeye or mahi-mahi, but that's partially what makes Costco's version so appealing. It's an everyday eater with an easy blank canvas for any type of seasoning, sauce, or cooking style, while the frozen packaging keeps meal times flexible for changing schedules or personal cravings. 

This fish has a notably strong Costco customer rating with 4.8 out of 5 stars from 51 reviews on the Costco product page. One favorable customer review describes struggles with getting an 81-year-old family member to eat any protein but loves the tilapia. Reddit feedback offers more details about why people keep buying the product. In a Costco discussion devoted specifically to the Kirkland tilapia loins, one shopper called them an easy dinner staple. Another said they liked how quickly the individually wrapped pieces defrosted, and someone else described them as their children's favorite fish. Shoppers in the same discussion suggested preparations ranging from lemon, butter, and garlic to Creole seasoning, panko breading, and air frying.

Purchase the Kirkland Signature Tilapia Loins at Costco for about $18.50 per bag.