Pick the Roast. If you can, choose USDA Prime. If you can't find it, then go with Choice. Ask your butcher to cut off the bone and tie it back on. Optional if you'd like your butcher to trim some fat before tieing the bones on.
Apply the Rub. Pour olive oil onto the roast, rubbing it all over. Liberally sprinkle on the kosher salt, black pepper, and garlic powder to cover the entire roast.
Rest in Fridge. Place the rib roast in a pan or dish and place it inside your refrigerator uncovered for 24 hours.
Remove from Fridge. 1-2 hours before cooking, remove the roast from the fridge to sit on the kitchen counter. This allows it to get to room temperature.
Start Smoker. Set your pellet grill or smoker to 250°F. Use hickory, oak, or your preferred wood.
Begin Smoking. Once the grill is ready, place the rib roast inside, keeping it in a pan. Insert a probe thermometer into the center of the meat.
Remove and Rest. Once the internal temperature reaches 120°F, remove the roast from the smoker. You can keep it in the same pan or transfer it to another rimmed dish or pan. Loosely cover with tin foil and rest the roast for at least 30 minutes or up to 1.5 hours. After resting, cut the butcher twine and remove bones. You can slice the bones to serve.
Sear the Meat. After resting, sear the outside of the roast by either placing it back in the smoker or oven set at 500°F for 10-15 minutes. You can also heat a cast-iron skillet with a drizzle of olive oil until it's scorching and place the roast inside. In the pan, turn the meat every couple of minutes, so you sear each side.
Slice and Serve. After searing, you don't need to let it rest. Slice the rib roast into about ½ inch slices and serve with au jus or horseradish.