Covering Roses

Question

At what time in the fall should I cover my Knockout roses ? The roses are in an area that is extremely windy and open to lots of snow/rain.

Answer 1

I usually wait until the first good hard frost and then several days of cold nights that send them off to their "Winters Nap" known as dormancy. That way the foliage has started drying out and falling off so the covering will not be as likely to entrap moisture that will cause over wintering funguses or molds.