Men's Garden Club of Pittsburgh

Deer Resistant Plants are listed on the bottom of this page

Frost Dates

Question: When can we expect our last frost in Allegheny County?

Answer: On average, residents of Pittsburgh receive their last hard frost on April 20. The average last hard frost for outlying communities is April 30. The frost free date is two weeks later. To be on the safe side, hold off planting tender vegetables and annuals until Memorial Day weekend. The holiday has been known as the traditional frost-free planting date around here for a very good reason-late spring frosts!

Frost-tolerant vegetables such as beets, broccoli, cabbage, carrots, cauliflower, kohlrabi, leeks, lettuce, onions, peas, radishes, spinach and Swiss chard can be. planted outdoors from mid- to late April. Pansies are frost-tolerant and can be planted outdoors at the same time.

The latest USDA Hardiness Zone Map places most of Allegheny, Beaver and Washington counties into Zone 6a, which averages winter lows of minus 5 to minus 10. Northeastern Allegheny County, the southern two-thirds of Butler County and Westmoreland County are listed as Zone 5b, which averages winter lows of minus 10 to minus 15.

To find the first and last frost dates for Pennsylvania click on the link below.

http://www.victoryseeds.com/frost/pa.html

Some Choice Woody Plants Considered "Deer-Resistant"

PSU Cooperative Extension at Pike County

CHOICE EVERGREEN SHRUBS

Andromeda (Pieris japonica)

Bearberry (Arctostaphylos uva-ursi)

Boxwood (Buxus sempervirens)

Daphne (Daphne sp.)

*Inkberry (Ilex glabra)

Littleleaf Boxwood (Buxus microphylla)

Mountain Laurel (Kalmia latifolia) select species

over hybrids, hybrids tend to be less

deer-resistant

*Oregon Grape Holly (Mahonia aquifolium)

Sweet Christmas Box (Sarcococca hookerana

CHOICE EVERGREEN TREES

American Holly (Ilex opaca)

*Austrian Pine (Pinus nigra)

Colorado Blue Spruce (Picea pungens glauca)

Japanese False Cypress (Chamaecyparis pisifera)

Juniper (Juniperus chinensis)

Norway Spruce (Picea abies)

Pines (Pinus sp.)

Pitch Pine (Pinus rigida)

Red Pine (Pinus resinosa)

*Scots Pine (Pinus sylvestris)

Spruce (Picea sp.)

Swiss Stone Pine (Pinus cemba)

White Spruce (Picea glauca)

CHOICE DECIDUOUS SHRUBS

*Beautybush (Kolkwitzia amabilis)

Bluebeard (Caryopteris x clandonensis)

Drooping Leucothoe (Leucothoe fontanesiana)

European Privet (Ligustrum vulgare)

*Forsythia (Forsythia sp.)

*Lilac (Syringa vulgaris)

Pawpaw (Asimina triloba)

*Potentilla (Potentilla fruticosa)

Sweet Fern (Comptonia peregrine)

*Wisteria (Wisteria floribunda)

CHOICE DECIDUOUS TREES

American Hophornbeam (Ostrya virginiana)

Beech (Fagus sp.)

Birch (Betula sp.)

Bottlebrush Buckeye (Aesculus parviflora)

Catalpa (Catalpa sp.)

Chinese Paper Birch (Betula albo-sinensis)

*European White Birch (Betula pendula)

Gray Birch (Betula populifera)

Green Ash (Fraxinus pennsylvanica)

Hawthorn (Crataegus laevigata)

*Japanese Flowering Cherry (Prunus serrulata)

Japanese Maple (Acer palmatum)

Japanese Plum Yew (Cephalotaxus harringtonia)

*Kousa Dogwood (Cornus kousa)

*Larch (Larix decidua)

Locust (Robinia pseudoacacia)

Mockernut Hickory (Carya tomentosa)

Paper Birch (Betula papyrifera)

Pignut Hickory (Carya glabra)

Pin Oak (Quercus palustris)

Poplar (Populus sp.) choose carefully, as many are

invasive or of poor quality

*Saucer Magnolia (Magnolia soulangeana)

Shadbush (Amelanchier canadensis)

 

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