How to Cook Crab Legs from Costco

Costco sells pre-cooked, flash-frozen king crab legs and snow crab clusters. They come ready to heat and serve.

The warehouse stocks both wild-caught Alaskan red king crab and golden king crab sections in their seafood department. You can find them in 10-pound boxes or smaller 2-pound packages.

Most people grab these for holiday dinners, special occasions, or a weeknight splurge. The convenience factor is huge since the legs are already cooked.

This guide covers five cooking methods with exact times and temperatures. Expect anywhere from 5 to 20 minutes depending on your approach.

You will need basic kitchen equipment: a large stock pot, steamer basket, baking sheet, or air fryer.

Product Details

Product: Kirkland Signature Wild Cooked King Crab Legs and Claws

Type: Pre-cooked, flash frozen

Package Size: 10 lbs (box) or 2 lbs (smaller packages)

Price: $32.99-$34.99 per pound at Costco (prices vary by location, updated December 2024)

Storage: Keep frozen at 0 degrees F or below

Calories per Serving: 130 calories per leg (134g)

Main Ingredients: King crab, salt (from natural seawater)

Item Number: 27621 (Golden King Crab Sections)

Cooking Methods Comparison

Method	Time	Equipment	Result	Best For
Steaming	5-7 min	Stock pot, steamer basket	Moist, tender meat	Best overall flavor
Boiling	3-5 min	Large pot	Quick, evenly heated	Large batches
Baking	15-20 min	Oven, baking sheet	Slightly caramelized	Hands-off cooking
Air Fryer	5-7 min	Air fryer	Crispy shell, easy crack	Small servings
Grilling	10-14 min	Outdoor grill	Smoky flavor	Summer cookouts

Recommended Method: Steaming produces the most tender, flavorful crab meat without diluting the natural sweetness.

Method 1: Steaming (Recommended)

Steaming takes 5-7 minutes for thawed legs at medium-high heat. This method keeps the meat moist and preserves that sweet, delicate flavor Bering Sea crab is known for. Works for 2-4 servings easily.

Step 1: How Do You Prepare the Crab Legs?

Thaw overnight in the refrigerator for best results. If short on time, run cold water over the frozen clusters for 30 minutes.

Instructions:

1. Remove crab legs from packaging and rinse under cold water
2. Check for any ice crystals and remove debris

Equipment: Large stock pot (8-12 quart), steamer basket or rack, tongs

Step 2: What Temperature and Time Do You Use?

Fill the pot with 2 inches of water. The water should sit below the steamer basket level.

Instructions:

1. Bring water to a rolling boil over high heat
2. Place crab legs in steamer basket above the water line
3. Cover and reduce heat to medium

Temperature: Medium-high heat (water at a steady simmer)

Time: 5-7 minutes for thawed legs, 10-12 minutes for frozen

Step 3: When Do You Check the Crab?

The steam does all the work here. No flipping required.

Instructions:

1. Check at 5 minutes for thawed crab
2. Look for steam escaping from the shells

Checkpoint: At 5-minute mark, smell for that distinct sweet seafood aroma

Step 4: How Do You Know When It’s Done?

Since Costco crab comes pre-cooked, you are just reheating. The shells will be hot to touch and release steam.

Instructions:

1. Meat should be opaque white with pink highlights
2. Shells feel hot when touched carefully
3. Strong seafood aroma fills the kitchen

Target Temperature: 145 degrees F internal (FDA recommendation for reheated seafood)

Visual Indicator: Steam rising from shell joints, meat appears pearly white

Method 2: Boiling

Boiling works best for large batches and party-sized portions. Takes just 3-5 minutes once the water returns to a boil. The trade-off is slightly less concentrated flavor since some escapes into the water.

Step 1: How Do You Prepare the Crab Legs?

Thawing is optional for this method. Frozen legs work fine but add 2 minutes to cook time.

Instructions:

1. Fill a large pot three-quarters full with water
2. Add 2 tablespoons of sea salt and optional Old Bay seasoning

Equipment: 12-16 quart stock pot, slotted spoon or spider strainer, colander

Step 2: What Temperature and Time Do You Use?

Get that water to a full rolling boil before adding the crab.

Instructions:

1. Bring seasoned water to a boil over high heat
2. Gently lower crab legs into the pot
3. Wait for water to return to a boil, then start timing

Temperature: High heat, full boil (212 degrees F)

Time: 3-5 minutes thawed, 5-7 minutes frozen

Step 3: When Do You Stir or Check?

Give the pot a gentle stir to ensure even heating.

Instructions:

1. Stir once at the 2-minute mark
2. Make sure all legs are submerged

Checkpoint: At 3 minutes, check one leg by cracking the shoulder joint

Step 4: How Do You Know When It’s Done?

The shells turn a brighter red-orange color when heated through.

Instructions:

1. Remove with slotted spoon to a colander
2. Let drain for 30 seconds before serving
3. Meat should be steaming and opaque

Visual Indicator: Bright orange shells, steam escaping from joints

Method 3: Oven Baking

Baking at 350 degrees F for 15-20 minutes produces a slight caramelization on the shell. This hands-off method works great when you have other dishes to prepare. Perfect for holiday dinners when stovetop space is limited.

Step 1: How Do You Prepare the Crab Legs?

Thaw the legs completely for best results with baking.

Instructions:

1. Preheat oven to 350 degrees F
2. Line a large baking sheet with aluminum foil
3. Arrange legs in a single layer

Equipment: Baking sheet, aluminum foil, pastry brush

Step 2: What Temperature and Time Do You Use?

Add moisture to prevent drying out.

Instructions:

1. Add 1/4 inch of water to the bottom of the pan
2. Brush legs with melted butter or olive oil
3. Cover tightly with foil to trap steam

Temperature: 350 degrees F

Time: 15-20 minutes covered, up to 25 minutes for larger legs

Step 3: When Do You Check?

No need to flip when covered properly.

Instructions:

1. Check at 15 minutes by carefully lifting foil corner
2. Look for steam escaping

Checkpoint: At 15-minute mark

Step 4: How Do You Know When It’s Done?

Open the foil carefully to avoid steam burns.

Instructions:

1. Shells should feel hot throughout
2. Crack one leg to check meat temperature
3. Meat should be opaque and flaky

Target Temperature: 145 degrees F internal

Visual Indicator: Steaming shells, slightly glossy appearance from butter

Method 4: Air Fryer

Air frying at 370 degrees F takes 5-7 minutes and makes the shells easier to crack. The circulating hot air removes moisture from the shell while keeping the meat tender inside. Great for 2 servings at a time.

Step 1: How Do You Prepare the Crab Legs?

Thawed legs work best in the air fryer. Snow crab clusters fit better than large king crab.

Instructions:

1. Rinse and pat dry with paper towels
2. Lightly brush with olive oil
3. Season with Old Bay or Cajun seasoning

Equipment: Air fryer (5-6 quart capacity), tongs, aluminum foil (optional)

Step 2: What Temperature and Time Do You Use?

Arrange in a single layer for even cooking.

Instructions:

1. Preheat air fryer to 370 degrees F
2. Place legs in basket without overcrowding
3. For extra moisture, wrap in foil first

Temperature: 370 degrees F

Time: 5-7 minutes for thawed, 8-10 minutes for frozen

Step 3: When Do You Check?

Flip halfway for even heating.

Instructions:

1. Open basket at 3-minute mark
2. Flip or rearrange legs

Checkpoint: At 3-4 minute mark

Step 4: How Do You Know When It’s Done?

The shells will feel dry to the touch and crack easier than steamed legs.

Instructions:

1. Check the shoulder joint for white, opaque meat
2. Shells should be hot throughout
3. Aromatic seafood smell

Visual Indicator: Dry, hot shells that crack with minimal pressure

Method 5: Grilling

Grilling at 300 degrees F for 10-14 minutes adds smoky flavor and impressive char marks. This works well for summer gatherings when you want to keep cooking outdoors.

Step 1: How Do You Prepare the Crab Legs?

Always thaw before grilling for even cooking.

Instructions:

1. Thaw completely in refrigerator overnight
2. Brush liberally with olive oil or melted butter
3. Season as desired

Equipment: Outdoor grill, long-handled tongs, grill brush

Step 2: What Temperature and Time Do You Use?

Medium heat prevents the shells from scorching.

Instructions:

1. Preheat grill to 300 degrees F
2. Place legs directly on clean grates
3. Close lid to trap heat

Temperature: 300 degrees F (medium heat)

Time: 5-7 minutes per side

Step 3: When Do You Flip?

One flip is all you need.

Instructions:

1. Flip at 5-7 minute mark
2. Look for light char marks on the first side

Checkpoint: At 5-7 minute mark, flip once

Step 4: How Do You Know When It’s Done?

Light grill marks and steaming shells indicate readiness.

Instructions:

1. Remove when shells are hot throughout
2. Meat should be opaque and steaming
3. Light char marks add flavor without burning

Visual Indicator: Light grill marks, steaming joints, aromatic smell

Safety and Quality Indicators

Food Safety:

• Internal Temperature: 145 degrees F minimum (FDA guideline for reheated seafood)
• Steam Check: Meat should steam when shell is cracked
• Thawing: Thaw in refrigerator overnight or under cold running water. Never thaw at room temperature.

Quality Indicators (Done Properly):

• Color: Opaque white meat with pink or red highlights
• Texture: Tender, slightly flaky, not rubbery
• Temperature: Hot throughout, steaming when cracked
• Appearance: Bright orange-red shells

Signs of Overcooking:

• Rubbery, tough meat texture
• Dry, stringy flesh
• Meat sticks to shell and tears when removing

Serving Suggestions

Portion Size: 1 pound per person as a main course (3-4 leg clusters). Half pound per person as part of a larger spread.

Serving Ideas:

• Classic garlic butter sauce with fresh lemon wedges
• Seafood boil spread with corn on the cob and red potatoes
• Surf and turf pairing with grilled ribeye steak

Pairing Recommendations:

• Drawn butter, clarified butter, or lemon butter sauce
• Steamed vegetables or grilled asparagus
• Crisp white wine like Chardonnay or Sauvignon Blanc
• Crusty bread for dipping in leftover butter

Building a full Costco seafood spread? Try pairing with Costco lobster tails for an impressive surf combination. Or go bigger with Dungeness crab from Costco if you prefer West Coast varieties.

Storage and Reheating

Leftover Storage:

• Refrigerate within 2 hours of cooking
• Store in airtight container or sealed bag
• Consume within 2-3 days
• Keep shells on for better moisture retention

Reheating Instructions:

• Microwave: Not recommended (makes meat rubbery)
• Stovetop: Quick saute in butter for 2-3 minutes over medium heat
• Steamer: 2-3 minutes over simmering water
• Target Temperature: 145 degrees F

Troubleshooting Common Issues

Issue: Meat is rubbery and tough

Cause: Overcooked. Since the crab is pre-cooked, it only needs reheating.

Solution: Reduce cooking time by 2-3 minutes. Check doneness earlier.

Issue: Meat is cold in the center

Cause: Not thawed properly before cooking, or removed too early.

Solution: Thaw completely before cooking or add 3-5 minutes for frozen legs.

Issue: Shell is hard to crack

Cause: This is normal for king crab due to thick, spiny shells.

Solution: Use a crab cracker tool or kitchen shears. Score the shell lengthwise before cooking to make extraction easier.

Issue: Meat tastes bland

Cause: Old or previously refrozen crab, or quality issue at purchase.

Solution: Season the water or butter generously with Old Bay or Cajun seasoning. Check package dates before buying.

Issue: Water-logged meat after boiling

Cause: Boiled too long or shells were cracked before cooking.

Solution: Switch to steaming method or reduce boil time. Keep shells intact during cooking.

Product Variations and Related Items

Similar Costco Seafood Products:

• Snow Crab Clusters: Smaller, sweeter meat, lower price point around $15-20 per pound
• Golden King Crab Sections: Smaller than red king crab but similar flavor, often more available
• Southern King Crab: Harvested from Argentina, milder flavor, lower cost

Cooking Time Adjustments:

• Snow crab legs cook 1-2 minutes faster than king crab
• Larger leg portions need 2-3 additional minutes
• Dungeness crab follows similar timing to snow crab

Looking for more warehouse club seafood ideas? Check out how to prepare Costco frozen shrimp or Costco scallops for additional options.

Which Method Should You Choose?

Choose Steaming when:

• You want the most tender, flavorful meat
• Cooking for 2-6 people
• You have 10-15 minutes

Choose Boiling when:

• Feeding a crowd (8+ people)
• Speed is the priority
• You want to add seasoning to the water

Choose Baking when:

• Stovetop space is limited
• You want hands-off cooking
• Making a holiday dinner with multiple dishes

Choose Air Fryer when:

• Cooking 1-2 servings
• You want easy-to-crack shells
• No large pots are available

Choose Grilling when:

• You want smoky flavor
• Hosting a summer cookout
• Kitchen space is limited

Time Comparison: Boiling (3-5 min) < Air Fryer (5-7 min) = Steaming (5-7 min) < Grilling (10-14 min) < Baking (15-20 min)

Texture Ranking: Steaming (most tender) > Boiling (tender) > Baking (slightly firm) > Air Fryer (easy crack) > Grilling (charred exterior)

FAQ on How To Cook Crab Legs Costco

How long do you cook frozen crab legs from Costco?

Frozen king crab legs take 10-12 minutes to steam and 5-7 minutes to boil.

Thawed legs cook faster at 5-7 minutes steaming or 3-5 minutes boiling.

The air fryer method needs 8-10 minutes at 370 degrees F for frozen clusters.

Are Costco crab legs already cooked?

Yes. Costco sells pre-cooked, flash-frozen crab legs harvested from the Bering Sea.

The legs are cooked immediately after catch to preserve freshness.

You are simply reheating them, which explains the short cooking time across all methods.

What is the best way to cook Costco king crab legs?

Steaming produces the most tender meat with the best flavor retention.

Fill a stock pot with 2 inches of water. Place legs in a steamer basket above the water line.

Cover and steam for 5-7 minutes until hot throughout.

Do you need to thaw Costco crab legs before cooking?

Thawing is recommended but not required.

Overnight refrigerator thawing yields the best results. Cold running water works for quick 30-minute thawing.

Cooking from frozen adds 3-5 minutes to any method and may cause uneven heating.

How much do Costco crab legs cost per pound?

Kirkland Signature wild caught king crab runs $32.99-$34.99 per pound depending on location.

The 10-pound box costs approximately $330-$350 total.

Smaller 2-pound packages are available at similar per-pound pricing.

How many crab legs per person should I buy?

Plan for 1 pound per person as a main course.

That equals roughly 3-4 leg clusters per serving. For appetizer portions, half a pound works.

A 10-pound box feeds 8-10 adults comfortably for a seafood dinner.

Can you cook Costco crab legs in an air fryer?

Absolutely. Set the air fryer to 370 degrees F and cook for 5-7 minutes.

Snow crab clusters fit better than large Alaskan king crab legs.

The hot air makes shells easier to crack while keeping the crab meat tender inside.

What seasonings go best with Costco crab legs?

Old Bay seasoning is the classic choice for steamed or boiled crab.

Cajun seasoning adds heat. Garlic butter sauce with fresh lemon juice works for dipping.

Keep it simple since quality king crab has natural sweetness worth preserving.

How do you know when crab legs are done cooking?

Look for steam escaping from shell joints and a strong seafood aroma.

The meat should appear opaque white with pink highlights when cracked open.

Shells feel hot to touch. Internal temperature reaches 145 degrees F per FDA guidelines.

Why are my Costco crab legs rubbery?

Overcooking causes rubbery texture. Since the legs are pre-cooked, they only need brief reheating.

Reduce cook time by 2-3 minutes on your next batch.

Steaming prevents this better than boiling, which can waterlog the delicate crab meat.

Conclusion

Learning how to cook Crab legs Costco takes minutes once you pick your method.

Steaming with a steamer basket delivers the most tender results. Boiling works for large batches. The air fryer makes shells crack easier.

Since Kirkland Signature crab legs come pre-cooked and wild caught, you are just reheating them.

Pair with garlic butter sauce, fresh lemon, and Old Bay seasoning for a restaurant-quality seafood dinner at home.

Grab a crab cracker tool and enjoy those snow crab clusters or king crab legs however you like them best.