How long to smoke prime rib
Smoke prime rib at 250°F for about 30 to 35 minutes a pound, and pull at 120°F, for medium rare, before the rest. That is for prime rib (bone-in rib roast); the calculator above fits the time to your weight and your heat.
Rest 15 to 30 minutes before slicing or pulling. USDA counts prime rib safe at 145°F with a 3 minute rest; a thermometer in the thickest part tells you more than the clock.
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Questions
What temperature do you pull prime rib at?
120°F, for medium rare, before the rest. Cook to that temperature rather than to the clock.
How long should prime rib rest?
15 to 30 minutes, loosely covered or wrapped, before slicing or pulling.
Should I cook to time or to temperature?
To temperature. The time tells you when to start and when to start checking; the meat is ready when the thickest part reaches its pull temperature.
Does my smoker change the time?
Not at the same temperature, as far as any cooker maker or test says. What changes is how steady it holds: keep the lid or door shut and the fire even, and the time holds too.