Prime rib comes from the primal rib section, specifically ribs six through twelve. That’s the area between the chuck (shoulder) and the loin (where T-bones live). Think of it as the beef equivalent of a penthouse apartment—prime real estate with little exercise. This muscle does almost no work, which is why it’s so marbled, tender, and buttery.
The term “prime” can be confusing. It refers to the cut’s location, not the USDA grade. You can have a Choice or even Select grade prime rib, but the name sticks. True Prime grade beef (as in USDA Prime) is rarer, with more fat marbling, and it’s what high-end steakhouses pray for.
