Maryland’s plant hardiness runs from USDA zone 5b in the western highlands to zone 8a on the lower Eastern Shore. Of the 65 landscape species this site tracks, 57 survive winter anywhere in that range, 8 survive only in part of it, and none fail across the whole state. The catch: which zone you garden in changes the answer for those 8.
What will not survive a winter in Maryland
That 5b-to-8a spread is wide by national standards, built entirely on one number: the average annual extreme minimum temperature, tracked under the USDA Plant Hardiness Zone Map. It says nothing about summer heat, soil, or rainfall, and it’s a statewide range rather than a single number. A recommendation dated to spring planting should point to a reference station near the reader, not to the range as a whole, because Garrett County and the Eastern Shore are not living through the same winter.
Here’s the useful news for anyone comparing plant lists across states: among the 65 species this site documents, zero fail across the entire Maryland range. There’s no table to build here, because there’s nothing to put in it. Every plant that shows up in this state’s dataset survives winter somewhere in Maryland.
That’s not the same as saying every plant is happy everywhere in the state. Hardy means survival, not comfort. A species can be rated hardy at the warm end of its range and still struggle there, because the upper number in a hardiness rating is frequently a heat limit rather than a cold one. A plant can survive a Maryland winter and still sulk through a Maryland summer for reasons the hardiness rating never measured. That distinction matters more in the next section, where the split isn’t survival at all, but which part of the state a plant is rated for in the first place.
The plants that work in part of the state and not the rest
Eight of the 65 documented species are rated hardy in only part of Maryland’s 5b-8a range. That’s the entire reason a state-level page like this one exists instead of a single blanket list: a gardener in Oakland, Maryland (5b) and one in Ocean City (7b-8a) are not being given the same answer, and treating them the same would be wrong for one of them.
These eight split into two groups, by which end of the range they drop out of.
| Plant | Its hardiness range | Where it fails in Maryland |
|---|---|---|
| Ficus carica (fig) | varies by cultivar | Not hardy in zones 5b, 6a, 6b |
| Hydrangea macrophylla | varies by cultivar | Not hardy in zone 5b |
| Lagerstroemia indica (crape myrtle) | varies by cultivar | Not hardy in zone 5b |
| Magnolia grandiflora | varies by cultivar | Not hardy in zone 5b |
| Syringa vulgaris (lilac) | varies by cultivar | Not hardy in zones 7b, 8a |
| Weigela florida | varies by cultivar | Not hardy in zones 7a, 7b |
| Picea abies (Norway spruce) | varies by cultivar | Not hardy in zone 8a |
| Thuja occidentalis (arborvitae) | varies by cultivar | Not hardy in zone 8a |
Four of these drop out at the cold end, meaning gardeners in the western Maryland highlands should look elsewhere. Three drop out at the warm end, meaning the lower Eastern Shore is where they fail. Weigela florida is the odd one, failing across two mid-range zones rather than at either extreme. The list names where each plant fails; it doesn’t say why, and no mechanism should be guessed onto it here.
Figuring out which side of that split applies to your own address means knowing your county’s zone, not just “Maryland’s” zone. The insulation page for this territory carries the county-level zone picture that pins this down.
The soil and the summer they will be planted into
Maryland’s representative soil, the Sassafras series, is an old, weathered Ultisol: acid at the surface (pH around 5.3), sandy (67 percent sand, 10 percent clay, 23 percent silt), low in organic matter (about 1.6 percent), and well drained. For a woody plant, that drainage matters more than the acidity. Winter-wet roots, not winter cold, are what kills more shrubs and perennials than any freeze does, and a well-drained sandy loam like Sassafras sheds that risk on its own. It’s the representative soil for the state as mapped, not a promise about any one backyard; a filled lot, a river bottom, or hill-country clay will behave nothing like it, and a soil test is the only way to know what’s actually under a given yard.
Summer rainfall at the reference station averages about 12.6 inches across June, July and August, with June the driest month at 3.98 inches and July the wettest at 4.48. Those numbers only mean something once they’re crossed with the ground they’re falling on. On a sandy, well-drained soil like Sassafras, an inch of rain moves through within a day; on a heavier clay soil elsewhere in the state, the same inch sits for a week. Add days at or above 90°F, common in a Maryland summer, and a single thunderstorm mostly runs off rather than soaking into the root zone. None of that converts cleanly into a watering schedule; it’s a reason to keep an eye on the soil under a specific plant rather than trust the state average.
When to plant, here
At the reference station, the last spring frost falls between April 3 and April 16, and the first fall frost between October 26 and November 5. Those are averages built on 1991-2020 records, not a guarantee for any given year, and western Maryland (Garrett and Allegany counties) runs weeks later on both ends, while the Eastern Shore runs milder.
The reasoning behind picking a window matters more than obeying a date. A newly planted woody species needs time to grow roots before it’s asked to support leaves through summer heat or survive a hard freeze with an undeveloped root system. That’s why nurseries and extension offices generally split the year into two windows rather than one.
| Window | What it suits | Main risk |
|---|---|---|
| Spring (after last frost, April 3-16 at the reference station) | Most Trees, Shrubs and Perennials; a full growing season to establish roots before winter | A late frost catching new growth if planted too early |
| Autumn (before first frost, October 26-November 5 at the reference station) | Many trees and shrubs, which root through the cooler months before spring growth | Less time to establish roots before a hard freeze, especially in the coldest part of the state’s range |
In the 5b end of Maryland, that autumn window closes faster than it does near the Bay, leaving less margin for a plant to root in before the ground freezes. Whichever window is chosen, a first-season plant needs regular water regardless of what its mature drought rating says. Drought tolerance ratings describe an established root system, not a plant still settling into the ground.
Where to read about each one
Of the 65 species crossed against Maryland’s range, 57 come back hardy statewide. Among the trees: Acer rubrum, Acer saccharum, Amelanchier canadensis, Betula nigra, Carpinus caroliniana, Cercis canadensis, Cornus florida, Ginkgo biloba, Juniperus virginiana, Liquidambar styraciflua, Nyssa sylvatica, Pinus strobus, Platanus occidentalis, Quercus alba, Quercus rubra, and Tilia americana. Among the shrubs: Aronia arbutifolia, Buxus sempervirens, Clethra alnifolia, Fothergilla gardenii, Hydrangea paniculata, Ilex glabra, Ilex verticillata, Itea virginica, Kalmia latifolia, Physocarpus opulifolius, Spiraea japonica, and Viburnum dentatum. Among the perennials: Achillea millefolium, Amsonia hubrichtii, Asclepias tuberosa, Baptisia australis, Echinacea purpurea, Heuchera americana, Iris sibirica, Lavandula angustifolia, Monarda didyma, Phlox paniculata, Rudbeckia fulgida, Salvia nemorosa, and Hylotelephium spectabile. A number of fruiting trees and shrubs also clear the whole range statewide, among them Asimina triloba, Diospyros virginiana, Prunus persica, Pyrus communis, and Vaccinium corymbosum.
The plant data behind all of it comes from the North Carolina Extension Gardener Plant Toolbox, a university extension database, and the ranges listed here are hardiness ranges crossed against Maryland’s own zone map, not the adaptation ranges used elsewhere on this site for apple varieties, which measure something different entirely.