Hardy cyclamen can survive brief and sometimes prolonged periods at temperatures below 0 degrees especially with snow cover. It is difficult to know how well they will grow in zones as low as 4 though growers have had success. It may depend on finding a favorable micro climate in colder winter areas. Weather buffers of trees, shrubs, buildings, amount of moisture, sun, etc. can make a difference in successfully growing cyclamen in severe cold. It is good to keep in mind that winter is their growing season when they need light and moisture. My opinion is some may survive three months of snow cover but they are not likely to thrive. As a general rule they will grow best in areas where average winter temperatures are above the freezing mark.

Hardy Cyclamen are ideally suited to growing in a shaded rockery or naturalized in the light shade of woodland borders. Here they combine with ferns, hardy perennials, and spring flowering bulbs of Scilla, Erythroniums, and Fritillaries. Planted in beds of their own they will create a colony of amazing color. Hardy cyclamen are one of the few flowering plants that will grow in the dry shade, one of the most challenging spots in any garden. Cyclamen roots are noncompetitive and can be planted among the roots of trees and large shrubs, both deciduous and evergreen.

https://hardycyclamens.secure.guardedhost.com/grow-hardy-cyclamen-outdoors.html