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I did a cpl 6 pounders last Dec. They took ~3.5 hours. I pan seared them, rubbed with Meathead's cow rust, and placed them on the WSM that averaged 230*.
No such thing as a dumb question. A standing rib roast is also called a Prime Rib Roast by many. Since it is such a great cut of meat many of us suggest no rub and just simple spices such as salt, pepper, garlic, and maybe rosemary. Here are links to several threads on the subject
Don't be scared of it, it is really easy. I keep the spice simple because I want the flavor of that good beef to come out so I just use some SPOG. Smoke it low, 200*-225* because it doesn't really take too long and I want time for smoke penetration. About 30 -45 minutes per pound but watch the IT, I feel a good rib roast should be med/rare so I take it to 130* then pull it and put it under a foil tent for about 45 mins - 1 hour, slice and enjoy!
I've also pulled and rested then sliced and threw on a 500* grill for about a min per side for a real nice sear, really steps up the flavor!
Jalee, I used to use tapatalk before SMF came out with the mobile version. The mobile version is much better than tap. To get to it all you have to do is click on mobile at the bottom of any page.