Mix all ribeye rub ingredients and rub all over ribeye roast. Refrigerate on lowest shelf uncovered overnight. Remove from fridge 1 hour before roasting.
Preheat oven to 250°F. Roast ribeye in a roasting pan until meat thermometer inserted into thickest part reads 115°F.
Remove from oven and let rest for at least 20 minutes. The ribeye can sit out up to 2 hours or be refrigerated until ready to eat. If refrigerating, make sure to bring the ribeye back to room temperature before reheating.
To reheat the ribeye roast, place roast back in the oven and cook for an additional 15 minutes, until internal temperature is 125°F and the top is browned and crisp. Let ribeye roast rest for at least 20 min before carving. Happy Eating!