USDA Zone 6: Deciduous Trees

Alder, mountain (Alnus tenuifolia)
Amur maackia (Maackia amurensis)
Apricot, Japanese flowering (Prunus mume)
Ash, European mountain (Sorbus aucuparia)
Aspen, quaking (Populus tremuloides)
Beech, American (Fagus grandifolia)
Beech, weeping (Fagus sylvatica 'Pendula')
Birch, paper (also called canoe birch, white birch) (Betula papyrifera)
Birch, river (Betula nigra)
Box elder (Acer negundo)
Buckeye, yellow (Aesculus flava)
Buckeye, red (Aesculus pavia)
Butternut (Juglans cinerea)
Cherry, Japanese flowering (Prunus x yedoensis)
Cherry, weeping Higan (Prunus subhirtella var. pendula)
Chittamwood, gum bumelia (Bumelia lanuginosa)
Chokecherry, Amur (Prunus maackii)
Coffeetree, Kentucky (Gymnocladus dioicus)
Cottonwood, black (Populus balsamifera)
Crabapple, flowering (Malus)
Dove-tree (Davidia involucrata)
Corneliancherry dogwood (Cornus mas)
Dogwood, flowering (Cornus florida)
Dogwood, kousa (Cornus kousa)
Elm, American (Ulmus americana)
Elm, Lacebark or Chinese (Ulmus parvifolia)
Elm, water, planertree (Planera aquatica)
Elm, winged (Ulmus alata)
Evodia (Evodia sp.)
Franklinia (Franklinia alatamaha)
Fringetree, Chinese (Chionanthus retusus)
Fringetree, white (Chionanthus virginicus)
Goldenrain tree (Koelreuteria paniculata)
Hackberry, common (Celtis occidentalis)
Hawthorn, green (Crataegus viridis)
Hickory, pignut (Carya glabra)
Honeylocust (Gleditsia triacanthos var. inermis)
Hophornbeam, Eastern, American hophornbeam, ironwood (Ostrya virginiana)
Hoptree (Ptelea trifoliata)
Hornbeam, European (Carpinus betulus)
Horsechestnut, common, European horsechestnut (Aesculus hippocastanum)
Horsechestnut, red (Aesculus x carnea)
Jujube, Chinese date (Ziziphus jujuba)
Katsuratree (Cercidiphyllum japonicum)
Laburnum, waterer or goldenchain tree (Laburnum x watereri)
Linden, Littleleaf (Tilia cordata)
Locust, black (Robinia pseudoacacia)
Magnolia, Ashe (Magnolia ashei)
Magnolia, saucer (Magnolia x soulangiana)
Magnolia, star (Magnolia stellata)
Magnolia, sweetbay (Magnolia virginiana)
Maple, amur (Acer ginnala)
Maple, bigleaf (Acer macrophyllum)
Maple, hedge (Acer campestre)
Maple, Japanese (Acer palmatum) (hardiness depends on cultivar)
Maple, Norway (Acer platanoides)
Maple, paperbark (Acer griseum)
Maple, red (Acer rubrum)
Maple, Southern sugar, Florida maple (Acer barbatum), marginal in Zone 6
Maple, trident (Acer buergerianum)
Maple, vine (Acer circinatum)
Oak, bluejack (Quercus incana)
Oak, bur (Quercus macrocarpa)
Oak, chestnut (Quercus prinus)
Oak, laurel (Quercus laurifolia)
Oak, Oregon white (Quercus garryana)
Oak, pin (Quercus palustris)
Oak, post (Quercus stellata)
Oak, Shumard (Quercus shumardii)
Oak, swamp chestnut (Quercus michauxii)
Oak, water (Quercus nigra)
Oak, white (Quercus alba)
Osage orange (Maclura pomifera)
Pawpaw, common (Asimina triloba)
Pear, flowering (Pyrus sp.)
Pecan (Carya illinoinensis)
Persimmon (Diospyros virginiana)
Pistache, Chinese (Pistacia chinensis)
Plum, blireiana (Prunus x blireiana)
Poplar, white (Populus alba)
Possumhaw (Ilex decidua)
Redbud, Eastern (Cercis canadensis)
Redwood, dawn (Metasequoia glyptostroboides) (deciduous conifer)
Sassafras, common (Sassafras albidum)
Silverbell, Carolina (Halesia tetraptera)
Snowbell, fragrant (Styrax obassia)
Snowbell, Japanese (Styrax japonicus)
Soapberry, western (Sapindus drummondii)
Stewartia, Japanese (Stewartia pseudocamellia)
Sourwood (Oxydendrum arboreum)
Sugarberry (Celtis laevigata)
Sweetgum (Liquidambar styraciflua)
Tupelo, black (Nyssa sylvatica)
Tupelo, water (Nyssa aquatica)
Walnut, black (Juglans nigra)
Walnut, English (Juglans regia)
Winterberry (Ilex verticillata)
Witchhazel, common (Hamamelis virginiana)
Yellowwood, American yellowwood (Cladrastis lutea)
Zelkova, Japanese (Zelkova serrata)