Dundalk, Maryland, sits in USDA hardiness zone 8a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Dundalk, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Dundalk lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Dundalk — soil, climate, flood, and parcel records. How we handle your address.
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Dundalk — the short answer
Dundalk, Maryland: USDA zone 8a, about 268 days between hard freezes, across 8K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Dec 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~268
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 8K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 8a is Dundalk's average, not your lot's — a low corner or a tree line moves it. Against Dundalk's 268-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dundalk
Each reading below is measured for Dundalk itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDundalk runs about 268 days between hard freezes — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDundalk sits in USDA hardiness zone 8a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Dundalk is in
Dundalk sits in the Middle Atlantic Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dundalk's own centroid, and it is not what its county reads: Baltimore County is mostly Northern Piedmont. The wider page above you is answering a different question about different ground.
What Grows in Dundalk
Every plant below cleared Dundalk's own zone 8a and its 268-day season. Each card opens that plant's Maryland profile. How we score.
Is it too late to plant in Dundalk?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 10; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 3 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
Documented around Dundalk
Spotted lanternfly documented 2 miles from Dundalk, first recorded 2021. What to watch for.
What's on the federal record near Dundalk
Closest first, within ~10 miles of Dundalk. Listing isn't leaking, and distance isn't exposure.
- SALLY BEAUTY SUPPLY #3786Brownfields · 150 ft
- CVS PHARMACY #4429Brownfields · 250 ft
- Amoco Oil Co.Underground Storage Tanks · 300 ft
- Dundalk ShellUnderground Storage Tanks · 400 ft
- Wise Avenue MotorsUnderground Storage Tanks · 750 ft
- Wise Ave BPUnderground Storage Tanks · 900 ft
- FREESTATE OIL LLCBrownfields · 1200 ft
- Dundalk Oil CompanyUnderground Storage Tanks · 1400 ft
- Amoco Service Station #5153Underground Storage Tanks · 1600 ft
- GRANGE ELEMENTARY SCHOOLBrownfields · 1800 ft
- PATAPSCO SENIOR HIGH SCHOOLBrownfields · 2000 ft
- ROH CLEANERSBrownfields · 2100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Dundalk's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Dundalk.
Sources Checked
within ~10 miles of Dundalk
Severity Distribution
within ~10 miles of Dundalk
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Dundalk
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Dundalk average
Your land is one point inside Dundalk
Everything above resolves to Dundalk as a whole — one PHZM band and one 28°F frost record, read across 8K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Dundalk Average
Dundalk Average
- ●USDA Zones 8a, averaged across Dundalk
- ●One soil character for all of Dundalk
- ●Frost dates read at Dundalk's scale: Mar 10 to Dec 3
YOUR Parcel
- ✓Your exact zone, not Dundalk's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dundalk
Pull a site-specific report for your exact address in Dundalk, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dundalk averages can't show:
We read public map data around Dundalk — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dundalk average
How we know this about Dundalk
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Dundalk’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Dundalk
When does frost risk typically end in Dundalk?
The last hard freeze (28°F) in Dundalk typically lands around Mar 10, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Mar 31.
When is the first frost in Dundalk?
The first hard freeze (28°F) in Dundalk typically arrives around Dec 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 19, so the watching starts about Nov 3 — about 268 days after the spring freeze cleared.
How long is the growing season in Dundalk?
Measured between 28°F hard freezes, Dundalk sees about 268 frost-free days — roughly Mar 10 through Dec 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 31 to Nov 19, about 233 days.
Is the soil safe to grow vegetables in Dundalk?
The federal record around Dundalk runs heavier than most — 4,281 documented sites, mostly Underground Storage Tanks entries (2,098), the nearest Brownfields record under a tenth of a mile out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Dundalk?
From about Nov 3 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Dec 3 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Dec 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dundalk's scale — its 8a band and its 268-day season. Your yard writes its own version of Dundalk's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Dundalk’s own scale
7 of the readings below were taken at Dundalk's own scale — its own ~268-day season between 28°F freezes, the 8,376 acres it covers and 4,281 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dundalk's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Dundalk's own 28°F hard-freeze dates, about Mar 10 and Dec 3 and the ~268-day span between themNOAA 1991–2020 Climate Normals
- 4,281 documented contamination sites on the federal record near Dundalk, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Dundalk's boundary and the 8,376 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~268-day seasonGrowable Ground crop-matching engine
- Dundalk sits in the Middle Atlantic Coastal Plain — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Dundalklydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dundalk's 8,376 acres read through its county's SSURGO summaryfrom Baltimore County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Baltimore County
- The growing challenges every Maryland grower plans around — written at state scale, so they stay on the state guidefrom Maryland
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Baltimore County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dundalk's 8,376 acreswhy one lot differs from the next →
- Which side of Dundalk you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 8,376 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record under a tenth of a mile out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Dundalk-wide figureread your own land →
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