Zone 4 Information
Zone 4 has blustery winters and warm summers. The area extends across the upper U.S. from Idaho to the Great Lakes. Parts of Connecticut, Delaware, District of Columbia, Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, and West Virginia are also included in this zone. Opportunities abound to grow lots of plants, so you can spend the long winters planning for beautiful gardens.
Zone 4 was divided in 1990 into two areas by the National Arboretum to provide gardeners with even more environmental detail: 4a and 4b.
4a - Minimum temperature of -30 to -25 F (-31.7 to -34.4 C) Places like Minneapolis/St.Paul, Minnesota Lewistown, Montana.
4b - Minimum temperature of -25 to -20 F (-28.9 to -31.6 C) Places like Northwood, Iowa and Nebraska.
Here's a partial list of plants that thrive in Zone 4
Creeping Cotoneaster(Cotoneaster adpressus)
Alpine Aster(Aster alpinus)
Japanese Barberry(Berberis thunbergii)
English Oak(Quercus robur)
Bee Balm(Monarda didyma 'Marshall's Delight')
Dwarf Periwinkle(Vinca minor variegatum)
Sugar maple(Acer saccharum)