If you’ve got a bucket of fresh-caught crab, here’s the simple, no-fuss way we cook it: boil the cleaned crab halves in water that tastes like the ocean, then plunge them into an ice bath. Halving the crabs before cooking shortens the time and makes cleaning so much less messy at the table.
Allergens: Contains: shellfish (crab). Free of: dairy, eggs, peanuts, tree nuts, wheat (for the boil itself; a melted-butter dip adds dairy).
Allergen info: Contains shellfish. The boil itself has no dairy, eggs, peanuts, or tree nuts. Serving with melted butter adds dairy, so use your family’s safe dip instead if needed. Check your seasoning label.
How Long to Boil Crab Halves
- Cleaned/split Dungeness halves: 10–12 minutes
- Smaller blue crab halves: closer to 8–10 minutes
- Larger pieces: the full 12 minutes
Start the timer only after the water comes back to a full rolling boil. These times are for raw crab you caught yourself. Store-bought legs are usually precooked and need much less.
What You’ll Need
- A big stockpot that holds enough water to fully cover the crab
- Long tongs
- A big bowl or clean sink of ice water
- Seafood crackers or mallets
How to Boil Crab Halves
Ingredients
Method
- Prepare the pot: Fill a large pot with enough water to fully cover the crab halves. Season it like seawater, about ½ cup salt per gallon. Add any optional Old Bay, bay leaves, garlic, lemon, or vinegar.
- Bring to a rolling boil over high heat.
- Add the crab: Carefully lower the halves in with tongs (very fresh crab may still move). Wait until the water returns to a full rolling boil, then start your timer.
- Boil 10–12 minutes for Dungeness halves (8–10 for smaller blue crab). Shells turn bright red-orange and the meat looks opaque, white, and firm.
- Ice bath: Move the halves straight into ice water for 3–5 minutes (up to 10 if not eating right away). This stops the cooking and makes the meat easier to pick out.
- Drain, crack, and serve with crackers, lemon wedges, and your dipping sauce.
Notes
- Cook fresh-caught crab the same day. If it’s been on ice a while it’s still fine, as long as the crab was alive when you cleaned and halved it.
- Don’t overcook. It makes the meat tough and rubbery.
- Steaming works too, with the same or slightly less time.
Prefer the Oven?
Try my oven-baked Dungeness crab halves with garlic butter.
Boiled Crab FAQ
How long do you boil crab halves?
10 to 12 minutes for cleaned, split Dungeness halves, timed from when the water returns to a rolling boil.
How do you know when crab is done?
The shells are bright red and the meat is opaque, not translucent, and pulls away easily.
Why put crab in an ice bath?
It stops the cooking so the meat doesn’t turn rubbery, and it makes the meat easier to remove from the shell.
How much salt do you put in crab boil water?
About ½ cup per gallon, so it tastes like seawater.
Is it better to boil or steam crab?
Both work. Steaming uses about the same time and can keep a little more moisture and flavor.
A quick note on photos: I’ve been perfecting these recipes for years, but I never published them because photographing everything takes so much time. As a busy working, homeschooling mom, I decided it was more important to get them out there to help other allergy families. So many of the photos here are AI-generated to show what the dish looks like, but the recipes themselves are real, made in my kitchen and tested on my family.
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Allergy note: I write these recipes with allergy families in mind, but every allergy is different. Always check labels on every product, every time, for allergens and cross-contamination (“may contain” or shared-facility) warnings, since formulations change. When in doubt, check with your allergist.
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