Mount Joy, Pennsylvania, sits in USDA hardiness zone 7a — 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, hazelnut, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Mount Joy, 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 Mount Joy 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 Mount Joy — soil, climate, flood, and parcel records. How we handle your address.
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Mount Joy — the short answer
Mount Joy, Pennsylvania: USDA zone 7a, about 225 days between hard freezes, across 2K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~225
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 7a is Mount Joy's average, not your lot's — a low corner or a tree line moves it. Against Mount Joy's 225-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mount Joy
Each reading below is measured for Mount Joy itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMount Joy runs about 225 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
MeasuredMount Joy sits in USDA hardiness zone 7a.
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 Mount Joy is in
Mount Joy sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Mount Joy's own centroid rather than borrowed from Lancaster County.
What Grows in Mount Joy
Every plant below cleared Mount Joy's own zone 7a and its 225-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Mount Joy?
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 Mar 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — 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 Mount Joy
Spotted lanternfly documented 2 miles from Mount Joy, first recorded 2019. What to watch for.
What's on the federal record near Mount Joy
Closest first, within ~10 miles of Mount Joy. Listing isn't leaking, and distance isn't exposure.
- REIST SEED COUnderground Storage Tanks · 300 ft
- RUTT APPLIANCESUnderground Storage Tanks · 400 ft
- MT JOY FARMERS COOP ASSOCUnderground Storage Tanks · 450 ft
- SICO 300 MOUNT JOY BULK PLTUnderground Storage Tanks · 500 ft
- SPANGLERS FLOUR MILLUnderground Storage Tanks · 750 ft
- WILKINS ROGERS MILLSBrownfields · 750 ft
- WILKINS ROGERS MILLSToxics Release Inventory · 750 ft
- AUTOKRAFT BOX CORPUnderground Storage Tanks · 900 ft
- LANCASTER CO AVTS MOUNT JOYBrownfields · 950 ft
- ST MARKS UNITED METH CHUnderground Storage Tanks · 1100 ft
- WILLIAM P STRUBE INCUnderground Storage Tanks · 1100 ft
- SCHOCK PRESB HOMEUnderground Storage Tanks · 1300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Mount Joy'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 Mount Joy.
Sources Checked
within ~10 miles of Mount Joy
Severity Distribution
within ~10 miles of Mount Joy
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mount Joy, two things run higher than the national average within ~10 miles of Mount Joy — CAFO (73 sites) and Toxics Release Inventory (94 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Mount Joy
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 Mount Joy average
Your land is one point inside Mount Joy
Everything above resolves to Mount Joy as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Mount Joy Average
Mount Joy Average
- ●USDA Zones 7a, averaged across Mount Joy
- ●One soil character for all of Mount Joy
- ●Frost dates read at Mount Joy's scale: Mar 31 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Mount Joy's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mount Joy
Pull a site-specific report for your exact address in Mount Joy, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mount Joy averages can't show:
We read public map data around Mount Joy — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mount Joy average
How we know this about Mount Joy
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 Mount Joy’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 Mount Joy
When does frost risk typically end in Mount Joy?
The last hard freeze (28°F) in Mount Joy typically lands around Mar 31, 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 21.
When is the first frost in Mount Joy?
The first hard freeze (28°F) in Mount Joy typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 225 days after the spring freeze cleared.
How long is the growing season in Mount Joy?
Measured between 28°F hard freezes, Mount Joy sees about 225 frost-free days — roughly Mar 31 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 28, about 190 days.
Is the soil safe to grow vegetables in Mount Joy?
The federal record around Mount Joy runs heavier than most — 1,289 documented sites, mostly Underground Storage Tanks entries (609), the nearest Underground Storage Tanks 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 Mount Joy?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mount Joy's scale — its 7a band and its 225-day season. Your yard writes its own version of Mount Joy'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 Mount Joy’s own scale
7 of the readings below were taken at Mount Joy's own scale — its own ~225-day season between 28°F freezes, the 1,543 acres it covers and 1,289 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mount Joy's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Mount Joy's own 28°F hard-freeze dates, about Mar 31 and Nov 11 and the ~225-day span between themNOAA 1991–2020 Climate Normals
- 1,289 documented contamination sites on the federal record near Mount Joy, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Mount Joy's boundary and the 1,543 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~225-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mount Joy's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Mount Joylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mount Joy's 1,543 acres read through its county's SSURGO summaryfrom Lancaster County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lancaster County
- The growing challenges every Pennsylvania grower plans around — written at state scale, so they stay on the state guidefrom Pennsylvania
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Lancaster County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mount Joy's 1,543 acreswhy one lot differs from the next →
- Which side of Mount Joy you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,543 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Mount Joy-wide figureread your own land →