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How Long to Cook a 10 lb Prime Rib — Large Roast Guide

A 10-pound prime rib (4–5 bone standing rib roast) feeds 10–12 people and represents a serious commitment — both in cost and timing. At 325°F, plan 3–4 hours from oven-in to resting-done, including the mandatory 30–45 minute rest period for a roast this large. The high-heat sear method works exceptionally well here: 500°F for 25–30 minutes creates a dramatic crust, then reduce to 325°F. Use a leave-in probe thermometer to monitor continuously without opening the oven.

A 10-pound prime rib requires a 40–45 minute rest minimum. Carryover cooking adds 10–15°F in a large roast. Pull from the oven at 110°F for medium-rare (finishing at 125°F after rest). Place on a cutting board tented with foil — do not place back in the hot roasting pan during rest.

Frequently Asked Questions

How long to cook prime rib per pound?
At 325°F after an initial high-heat sear: rare is about 13 min/lb (pull at 115°F), medium rare 15 min/lb (pull at 120°F), and medium 17 min/lb (pull at 130°F). Always use a meat thermometer — weight estimates can vary by 20% due to bone content and refrigerator temperature.
What temperature should I pull prime rib from the oven?
Pull prime rib 10–15°F below your target: rare pull at 115°F (reaches 125°F), medium rare pull at 120°F (reaches 130°F), medium pull at 130°F (reaches 140°F). Carryover cooking during the 30-minute rest does the rest of the work.
Should I sear prime rib before or after cooking?
Searing before (traditional method) works well — 450°F for 20 min to build the crust, then reduce to 325°F to finish low and slow. Reverse-searing after (rest, then high-heat finish) gives more control over doneness but requires watching closely.

Frequently Asked Questions

How long does a 10 lb prime rib take to cook?
At 325°F, a 10-pound prime rib takes approximately 3–4 hours (18–20 minutes per pound). At 350°F, about 2.5–3.5 hours. These are estimates — use an instant-read or probe thermometer and pull at 110–115°F for medium-rare. Rest 40–45 minutes before carving. Total time from oven-in to first slice: approximately 4.5–5 hours.
How many people does a 10 lb prime rib feed?
A 10-pound bone-in prime rib (4–5 ribs) feeds 10–12 people for a main course with sides. A 10-pound boneless prime rib feeds 12–14. For a holiday party with many appetizers and sides, a 10-pound bone-in roast stretches to 14–16 servings. Bones account for about 30% of the weight — factor this into your per-person planning.
What is the best temperature for prime rib?
Most people prefer prime rib at medium-rare (130–135°F after rest). The cut is expensive and well-marbled — cooking past medium (145°F) wastes its potential. Doneness levels: rare 120–125°F, medium-rare 130–135°F, medium 140–145°F. The center of the roast will be your target doneness; slices toward the ends will be one doneness level higher, which can satisfy guests who prefer more well-done.

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