| Zone |
Average Minimum Temperature Range |
Indicator Plants (Representative plants that grow well in this Zone but not in colder Zones.) |
3a
 |
-40 to -35 F -37 to -40 C |
Berberis thunbergii (Japanese bayberry)
Elaeagnus angustifolia (Russian olive)
Junipercus communes (Common juniper)
Lonicera tatarica (Tatarian honeysuckle)
Malus baocata (Siberian crabapple)
Thuja occidentalis (American arborvitae) |
3b
 |
-35 to -30 F -34 to -37 C |
4a
 |
-30 to -25 F -32 to -34 C |
Acer saccharum (Sugar maple)
Hydrangea paniculata (Panicle hydrangea)
Juniperus chinensis (Chinese juniper)
Ligustrum amurense (Amur River privet)
Parthenocissus quinquefolia (Virginia creeper)
Spiraea x vanhouttei (Vanhouffe spirea)
|
4b
 |
-25 to -20 F -29 to -32 C |
5a
 |
-20 to -15 F -26 to -29 C |
Cornus florida (Flowering dogwood)
Deutzia gracilis (Slender deutzia)
Ligustrum vulgare (Common privet)
Parthenocissus tricuspidata (Boston ivy)
Rosa multiflora (Japanese rose)
Taxus cuspidata (Japanese yew) |
5b
 |
-15 to -10 F -23 to -26 C |
6a
 |
-10 to -5 F -21 to -23 C |
Acer palmatum (Japanese maple)
Buxus sempervirens (Common boxwood)
Euonymus follunei (Winter creeper)
Hedera helix (English ivy)
Ilex opaca (American holly)
Ligustrum ovalifolium (California privet) |
6b
 |
-5 to 0 F -18 to -21 C |
7a
 |
0 to 5 F -15 to -18 C |
Acer macrophylium (Bigleaf maple)
Rhododendron Kurume hybrids (Kurume azalea)
Cedrus atlantica (Atlas cedar)
Cotoneaster microphylla (Small-leaf cotoneaster)
Ilex aquifolium (English holly)
Taxus baccata (English yew)
|