getting ready to lat out a small vinyard for a brother in law in montrose colorado elevation 5700 feet zone five i i understand it can reach -22-25 but not every year. i think we will try to plant six rows of twelve vines. thinking of the minnisota vines, marquette, la crescent, frontenac gris, with swenson red bluebell, reisling. i have never raised these varietys or in this climate. in southern oklahoma i had to use munson varietys america, and champanel did best and both are pierces resistant, i read that pierces has been found at delta and grand junction just north of us so will most likely need resistant rootstocks. the champanel is totally imune root and plant i have read but is only good thru zone 6. question questions.