Cook Time for a 10 lb Prime Rib
Low-and-slow phase only; add a 30-minute rest and a 10-minute sear.
| Smoker or oven | Per pound | 10 lb roast |
|---|---|---|
| 225°F / 107°C | about 35 min | about 5–6.5 h |
| 250°F / 121°C | 30–35 min | about 4.5–6 h |
Pull it at 115–120°F (46–49°C) for rare, 120–125°F (49–52°C) for medium-rare or 130–135°F (54–57°C) for medium.
Schedule for Dinner at 6 pm
At 250°F:
| Step | Start at |
|---|---|
| Dry-brine | the day before |
| Out of the fridge | 10:45 am |
| Light the smoker | 11:15 am |
| Roast on | 11:45 am |
| Off to rest | 5:00 pm |
| Sear at 500°F | 5:30 pm |
| Carve and serve | 6:00 pm |
The roast holds, tented, for up to an hour, so start a little early.
How Many People It Serves
Plan 1 lb bone-in per person, or one rib for every two guests. A 10 lb roast with 5 ribs serves about 10 people.
Plan Your Prime Rib
Answer a few quick questions and get a full step-by-step plan.
Frequently Asked Questions
How long does a 10 lb prime rib take at 250°F?
About about 4.5–6 h to reach 120–125°F for medium-rare, then 30 minutes of resting and a 10-minute sear.
How long does a 10 lb prime rib take at 225°F?
About about 5–6.5 h, roughly 35 minutes per lb, plus resting and searing.
How many people does a 10 lb prime rib feed?
About 10 people: 1 lb bone-in each, or one rib for every two guests.
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