Oven Roasted Prime Rib (Reverse Sear)
A low-and-slow 250°F roast to 120°F internal, then a 500°F blast for the crust — the reverse-sear method that puts a bakery-red rosy center corner-to-corner.
oven Timer
Set for 150 mins @ 250°F then 500°F sear
Ingredients
Base recipe calibrated for 8 adults.
Get to the Point
Dry-brine 6 lb bone-in roast 24 hrs; rest at room temp 2 hrs before cooking.
Roast bone-side down at 250°F to 120°F internal (about 2.5 hrs for medium-rare).
Rest tented 25 min, then blast 500°F for 8 min until crust bubbles deep brown.
Slice against the grain in 1/2-inch slabs, one per rib bone.
Step-by-Step Guided Instructions
Rub a 6 lb bone-in standing rib roast all over with 2 tbsp kosher salt and 1 tbsp coarse black pepper. Set on a wire rack over a sheet pan, uncovered, in the fridge for 24 hours.
The dry brine is the single biggest flavor investment you can make. Skin dries out, forming the crust foundation, and the salt penetrates all the way to the bone.
Two hours before cooking, pull the roast from the fridge and let it sit on the counter uncovered. This drops the temperature differential between surface and center so the roast cooks evenly.
A cold-from-the-fridge roast has a gray band 3/4 inch thick around a barely-cooked center. Tempering shrinks the band to a thin edge.
Preheat oven to 250°F. Rub the roast with 2 tbsp softened butter, 3 minced garlic cloves, 1 tbsp minced fresh rosemary, and 1 tbsp minced fresh thyme. Set bone-side down on a rack in a roasting pan. Insert a probe thermometer into the thickest part.
The rib bones are a natural roasting rack — bone-side down elevates the meat from pan drippings and lets convection circulate all around.
Roast at 250°F until the probe reads 120°F for medium-rare (about 2.5 hours for a 6-lb roast, or roughly 25 minutes per pound). Pull the roast when the probe hits 120°F — no earlier, no later.
The probe is the single most important piece of equipment here. Time-per-pound is a guess; internal temp is fact. Trust the probe.
Move the roast to a cutting board, tent loosely with foil, and rest 25 minutes while the oven cranks to 500°F. Internal temp will carry over to 128°F — the target for medium-rare after the sear.
Cutting a hot roast releases every drop of juice onto the board. Resting gives the muscle fibers time to relax and hold their liquid — this is not optional.
Return the rested roast to the 500°F oven for 6-8 minutes until the crust bubbles, browns, and darkens to a mahogany color. Pull, transfer to the board, and slice against the grain into 1/2-inch slabs.
The sear only browns — it does not raise the internal temp meaningfully in 8 minutes. Watch the crust color, not a timer.
Buy the roast at least 3 days before you cook it and dry-brine the last 24 hours. The 2 days of rest deepen the beef flavor via natural enzymatic aging, and you have never tasted rib roast like it.
Slice a thin outer piece and dice into 1/2-inch cubes for kids — the edge slices are well-done and easier for young mouths. Serve with ketchup, not au jus.
- Yorkshire pudding or popovers
- Creamy horseradish sauce
- Roasted root vegetables and gravy from drippings
Slice cold, then warm slices in a covered skillet with 1 tbsp beef broth over medium-low for 3 minutes only — any longer and medium-rare turns to medium-well. Never microwave prime rib.