Zone 1

Below -45.6 C
Below -50 F

Betula glandulosa  (Dwarf birch)
Empetrum nigrum  (Crowberry)
Populus fremuloides  (Quaking aspen)
Potentilla pensylvanica  (Pennsylvania cinquefoil)
Rhododendron lapponicum  (Lapland rhododendron)
Salix reticulate  (Netleaf willow)

Zone 2
-50 to -40 F
-45.6 to -40 C

Betula papyrifera  (Paper birch)
Cornus canadensis  (Bunchberry dogwood)
Elaeagnus commutata  (Silverberry)
Larix laricina  (Eastern larch)
Potentilla fruticosa  (Bush cinquefoil)
Viburnum trilobum  (American cranberry bush)

Zone 3
-40 to -30 F
-40 to -34.5 C

Berberis thunbetgii  (Japanese bayberry)
Elaeagnus angustifolia  (Russian olive)
Junipercus communes  (Common juniper)
Lonicera tatarica  (Tatarian honeysuckle)
Malus baocata  (Siberian crabapple)
Thuia occidentalis (American arborvitae)

Zone 4
-30 to -20 F
-34.5 to -28.9 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)

Zone 5
-20 to -10 F
-28.9 to -23.3 C

Cornus florida  (Flowering dogwood)
Deutzia gracilis  (Slender deutzia)
Ligustrum vulgare  (Common privet)
Paithenocissus tricuspidata  (Boston ivy)
Rosa multiflora  (Japanese rose)
Taxus cuspidata  (Japanese yew)

Zone 6
-10 to 0 F
-23.3 to -17.8 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)

Zone 7
0 to 10 F
-17.8 to -12.3 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)

Zone 8
10 to 20 F
-12.3 to -6.6 C
Arbutus unedo  (Strawberry tree)
Choisya temata  (Mexican orange)
Olearia haastii  (New Zealand daisy-bush)
Pittosporum tobira  (Japanese pittosporum)
Prunus laurocerasus  (Cherry-laurel)
Viburnum tinus  (Laurestinus)

Zone 9
20 to 30 F
-6.6 to -1.1 C

Asparagus setacous  (Asparagus fern)
Eucalyptus globulus  (Tasmanian blue gum)
Syzygium paniculatum  (Australian bush cherry)
Fuchsia hybrids  (Fuchsia)
Grevillea robusta  (Silk-oak)
Schinus molle  (California pepper tree)

Zone 10
30 to 40 F
-1.1 to 4.4 C

Bougainvillea spectabilis  (Bougainvillea)
Cassia fistula  (Golden shower)
Eucalyptus citriodora  (Lemon eucalyptus)
Ficus elastica  (Rubber plant)
Ensete ventricosum  (Ensete)
Roystonea regia  (Royal palm)