Joppatowne, Maryland, sits in USDA hardiness zone 8a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor cabbage, fig, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Joppatowne, 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 Joppatowne 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 Joppatowne — soil, climate, flood, and parcel records. How we handle your address.
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Joppatowne — the short answer
Joppatowne, Maryland: USDA zone 8a, about 257 days between hard freezes, across 4K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~257
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K 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 Joppatowne's average, not your lot's — a low corner or a tree line moves it. Against Joppatowne's 257-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Joppatowne
Each reading below is measured for Joppatowne itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredJoppatowne runs about 257 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredJoppatowne 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 Joppatowne is in
Joppatowne sits in the Southeastern Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Joppatowne's own centroid, and it is not what its county reads: Harford County is mostly Northern Piedmont. The wider page above you is answering a different question about different ground.
What Grows in Joppatowne
Every plant below cleared Joppatowne's own zone 8a and its 257-day season. Each card opens that plant's Maryland profile. How we score.
Is it too late to plant in Joppatowne?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 28 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Joppatowne
Spotted lanternfly documented 3 miles from Joppatowne, first recorded 2020. What to watch for.
What's on the federal record near Joppatowne
Closest first, within ~10 miles of Joppatowne. Listing isn't leaking, and distance isn't exposure.
- GENCO'S AUTOBODYBrownfields · 650 ft
- SPECIALTY ENVIRONMENTAL SVCSBrownfields · 650 ft
- JOPPATOWNE HIGH SCHOOLBrownfields · 1700 ft
- HA Dd 108Nitrate · 1800 ft
- Former Joppa Sand & Gravel SiteUnderground Storage Tanks · 2000 ft
- JOPPATOWNE ELEMENTARY SCHOOLBrownfields · 2600 ft
- MarineMax, Inc.Underground Storage Tanks · 0.5 mi
- Mobil Station 16 HDMUnderground Storage Tanks · 0.6 mi
- RB ENVIRONMENTAL SVS INCBrownfields · 0.6 mi
- MIKE'S CUSTOM AUTOMOTIVEBrownfields · 0.7 mi
- MDTA BRIDGE H-X758001Brownfields · 0.7 mi
- Sheetz #316Underground Storage Tanks · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Joppatowne'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 Joppatowne.
Sources Checked
within ~10 miles of Joppatowne
Severity Distribution
within ~10 miles of Joppatowne
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 Joppatowne
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 Joppatowne average
Your land is one point inside Joppatowne
Everything above resolves to Joppatowne as a whole — one PHZM band and one 28°F frost record, read across 4K 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 Joppatowne Average
Joppatowne Average
- ●USDA Zones 8a, averaged across Joppatowne
- ●One soil character for all of Joppatowne
- ●Frost dates read at Joppatowne's scale: Mar 16 to Nov 28
YOUR Parcel
- ✓Your exact zone, not Joppatowne's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Joppatowne
Pull a site-specific report for your exact address in Joppatowne, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Joppatowne averages can't show:
We read public map data around Joppatowne — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Joppatowne average
How we know this about Joppatowne
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 Joppatowne’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 Joppatowne
When does frost risk typically end in Joppatowne?
The last hard freeze (28°F) in Joppatowne typically lands around Mar 16, 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 Apr 6.
When is the first frost in Joppatowne?
The first hard freeze (28°F) in Joppatowne typically arrives around Nov 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 14, so the watching starts about Oct 29 — about 257 days after the spring freeze cleared.
How long is the growing season in Joppatowne?
Measured between 28°F hard freezes, Joppatowne sees about 257 frost-free days — roughly Mar 16 through Nov 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 6 to Nov 14, about 222 days.
Is the soil safe to grow vegetables in Joppatowne?
The federal record around Joppatowne is a meaningful one — 1,421 documented sites, mostly Underground Storage Tanks entries (607), the nearest Brownfields record about 0.1 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Joppatowne?
From about Oct 29 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 Nov 28 (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 Nov 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Joppatowne's scale — its 8a band and its 257-day season. Your yard writes its own version of Joppatowne'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 Joppatowne’s own scale
7 of the readings below were taken at Joppatowne's own scale — its own ~257-day season between 28°F freezes, the 4,307 acres it covers and 1,421 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Joppatowne's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Joppatowne's own 28°F hard-freeze dates, about Mar 16 and Nov 28 and the ~257-day span between themNOAA 1991–2020 Climate Normals
- 1,421 documented contamination sites on the federal record near Joppatowne, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Joppatowne's boundary and the 4,307 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~257-day seasonGrowable Ground crop-matching engine
- Joppatowne sits in the Southeastern Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Joppatownelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Joppatowne's 4,307 acres read through its county's SSURGO summaryfrom Harford County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Harford 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 Harford County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Joppatowne's 4,307 acreswhy one lot differs from the next →
- Which side of Joppatowne you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,307 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 miles 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 Joppatowne-wide figureread your own land →
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