Gene's right, Bob. Try Negronne, Vista, Black Mission or any of that type; Ronde de Bordeaux; Chicago Hardy, Sal's EL, Sal's Corleone, or any of the Mongibello types; Celeste varieties. However, noto bene, "cold hardy" is a relative term. Some Say don't put a tree younger than five years on the ground. Most say you still have to winterize. I keep all mine in pots and garage them in the winter. Someone out there will offer you more and better advice than this.