Preheat the Traeger grill by setting the temperature to 225F and allow to heat with the lid closed for 15 minutes.
Prepare the pork tenderloin by trimming off any silver skin and fat. Generously sprinkle the pork tenderloin with Traeger pork rub. You can do this ahead of time if needed. After seasoning, place the pork tenderloin on a sheet pan with a wire rack and refrigerate for 2-4 hours.
Once the Traeger has reached 225F, lay the pork loin in the grill grate and close the lid. Cook the pork loin for and hour and a half, flipping the pork tenderloin halfway through to create grill marks on both sides.
Once the pork loin has reached an internal temperature of 145F, remove it from the grill and allow it to reset for 10 minutes before slicing.