Pork butt vs pork shoulder, the confusing names explained
Walk into a butcher shop, look at the pork case, and you'll see "Boston butt," "pork shoulder," and sometimes "picnic shoulder" or "pork butt roast." They're not all the same thing. But they're confusingly related. Most people use the names interchangeably and end up buying the wrong cut for what they're trying to cook.
Here's the actual breakdown, with the anatomy, the history, and which one you want for pulled pork, carnitas, or smoked bacon.
They are both "shoulder," technically
The whole pork shoulder is a primal cut that runs from the top of the pig's front leg up through what would be a human shoulder blade area. In a commercial butcher operation, this primal gets separated into two sub-primals:
- Boston butt (also called "pork butt"): the upper portion of the shoulder. Contains the shoulder blade bone. Roughly 6-10 pounds.
- Picnic shoulder (also called "pork shoulder picnic" or sometimes just "pork shoulder"): the lower portion, closer to the front leg. Contains a section of leg bone. Roughly 5-9 pounds.
So "pork shoulder" is technically the whole primal. "Boston butt" is the top half. "Picnic" is the bottom half. But in practice, most stores sell the butt as "pork butt" or "Boston butt" and the picnic as "pork shoulder," even though technically both are shoulder.
And that's where the confusion starts.
Why is it called a "butt" when it comes from the front?
Because of barrels. Back in colonial New England, butchers shipped pork in wooden barrels called "butts." The Boston butchers figured out that the upper shoulder was the best section to pack into these barrels, so they became associated with Boston. "Boston butt" entered the vernacular, stuck, and never made sense geographically since then.
It's got nothing to do with the pig's rear. Pig's rear is called "ham."
Which one for pulled pork?
Boston butt. Always.
The butt has better intramuscular marbling, a uniform shape that cooks evenly, and a single bone (the shoulder blade) that's easy to remove once the meat is done. The picnic has a tougher texture, more connective tissue, a layer of skin on top that you have to deal with, and a leg bone that's more awkward to work around.
Every BBQ championship I've ever watched uses Boston butt for pulled pork. Costco sells bone-in Boston butts in two-packs, around 16 pounds total, usually under $2/lb. That's the play.
Which one for carnitas or cuban-style mojo?
Either works, but butt is easier.
For carnitas (braise-then-crisp Mexican-style), Boston butt cubed into 2-inch chunks is perfect. The fat content renders into the braise, and the meat shreds easily. Picnic shoulder works but you'll need to remove the skin and deal with tougher cuts of connective tissue.
For Cuban mojo pork, bone-in Boston butt again. Marinate 24 hours in citrus, garlic, oregano, cumin. Roast at 325F until probe-tender.
What's the picnic shoulder good for?
Three things.
Bacon. The picnic has a skin layer ("rind") that cures beautifully. Home bacon makers love the picnic for this. Cure with pink salt and brown sugar for a week, cold-smoke at 170F for 4-6 hours, and slice.
Stew meat and ground pork. The picnic is cheap, and cubed or ground it becomes excellent base material. Sausage, chili, pork ragu.
Budget pulled pork. If your grocery store has picnic on sale at $1.29/lb and butt is $2.49/lb, and you're feeding a big group, picnic will absolutely make pulled pork. Just remove the skin before rubbing, and expect slightly stringier texture.
Cook times and method (both cuts)
Both Boston butt and picnic are collagen-heavy cuts that reward the same low-and-slow treatment. 225F pit, hickory or pecan wood, smoke to 165F internal, optionally wrap in foil or butcher paper, finish to 203F probe-tender, rest wrapped for 45-60 minutes.
The SmokeMeatCalc home calculator handles both: use the pork butt preset for either cut. Expect 1.5 to 2 hours per pound at 225F. An 8-pound cut typically runs 12-16 hours.
How to pick a good butt at the store
Three things I check:
- Marbling on the cut surface. You want visible fat threading through the meat, not just a cap. Butts with more marbling stay juicier.
- Weight. 7-9 pounds is ideal. Under 6 pounds you're fighting a dry flat; over 10 pounds you're adding 4+ hours without much upside.
- Color. Fresh pink, not gray or iridescent. If it's been sitting in the case a while, ask for a fresh one from the back.
Boston butts are sold bone-in or boneless. Bone-in holds moisture better during the cook and gives you a doneness signal (the blade bone wiggles out clean when probe-tender). Boneless cooks faster and is easier to portion. For smoking, always bone-in.
The Costco two-pack play
Costco in most US regions sells two-packs of bone-in Boston butts in Cryovac, total weight around 16 pounds. This is the best deal in BBQ. One butt for this weekend, one butt in the freezer for next month. Cryovac keeps fresh in the fridge for 3 weeks unopened, and 4-6 months frozen without quality loss.
Sam's Club runs the same deal. Walmart carries single Boston butts at around $1.89/lb last I checked.
One more naming note: "pork butt roast"
Some supermarkets sell a "pork butt roast" that's actually a boneless picnic shoulder trimmed and tied into a roast shape. Read the label. If it says "pork shoulder" anywhere, or if it has visible skin on one side, it's a picnic dressed up for the home oven. For smoking, go back to the case and find the Boston butt with the bone in.
The simple rule
Pulled pork? Bone-in Boston butt, 7-9 pounds, 225F, 1.5 to 2 hr/lb, pull at 203F. That's it. Use the calculator to plan the start time.
Smoking brisket instead? Different cut, different rules. Head to brisketcalc.com for that one.