Oklahoma
This is in the top five list of great hybrid teas in my opinion, and is possibly my favorite red rose.  My plant has good disease resistance for a hybrid tea, and very good rebloom even in part shade.  The large, full blooms are the most velvety deep color, and are matched with the most intense fragrance befitting a deep red rose.  See also my Climbing Oklahoma, as that is a wonderfully vigorous plant. 
Bred by Swim and Weeks in 1964, it received the Japan Gold Medal.  Rated as hardy from zone 5.