Mount Holly, North Carolina, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Mount Holly, 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 Holly 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 Holly — soil, climate, flood, and parcel records. How we handle your address.
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Mount Holly — the short answer
Mount Holly, North Carolina: USDA zone 8a, about 244 days between hard freezes, across 7K acres of city.
- 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 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~244
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 7K 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 Mount Holly's average, not your lot's — a low corner or a tree line moves it. Against Mount Holly's 244-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mount Holly
Each reading below is measured for Mount Holly itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMount Holly runs about 244 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 Holly 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 Mount Holly is in
Mount Holly sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Mount Holly's own centroid rather than borrowed from Gaston County.
What Grows in Mount Holly
Every plant below cleared Mount Holly's own zone 8a and its 244-day season. Each card opens that plant's North Carolina profile. How we score.
Is it too late to plant in Mount Holly?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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 15 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Mount Holly
Spotted lanternfly documented 16 miles from Mount Holly, first recorded 2023. What to watch for.
What's on the federal record near Mount Holly
Closest first, within ~10 miles of Mount Holly. Listing isn't leaking, and distance isn't exposure.
- Oliver MineMining · 1400 ft
- CIRCLE A FOOD STOREUnderground Storage Tanks · 1600 ft
- FREIGHTLINER CORPORATIONUnderground Storage Tanks · 1700 ft
- DAIMLER TRUCKS NORTH AMERICA, LLC - MT. HOLLY PLANTToxics Release Inventory · 0.7 mi
- DAIMLER TRUCKS NORTH AMERICA, LLC - MT. HOLLY PLANTBrownfields · 0.7 mi
- AUTO TRUCK TRANSPORT USAUnderground Storage Tanks · 0.8 mi
- NEW NGC, INC. D/B/A NATIONAL GYPSUM COMPANYBrownfields · 0.8 mi
- NEW NGC, INC. D/B/A NATIONAL GYPSUM COMPANYToxics Release Inventory · 0.8 mi
- LEE'S QUICK STOPUnderground Storage Tanks · 0.9 mi
- MOUNT HOLLY SEWAGE PUMP STATIONUnderground Storage Tanks · 1.0 mi
- DYSTAR LP MOUNT HOLLY PLANTToxics Release Inventory · 1.0 mi
- DUKE ENERGY CAROLINAS, LLC - MT HOLLY STATIONBrownfields · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Mount Holly'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 Holly.
Sources Checked
within ~10 miles of Mount Holly
Severity Distribution
within ~10 miles of Mount Holly
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mount Holly, two things run higher than the national average within ~10 miles of Mount Holly — Superfund (23 sites) and Toxics Release Inventory (113 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Mount Holly
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 Holly average
Your land is one point inside Mount Holly
Everything above resolves to Mount Holly as a whole — one PHZM band and one 28°F frost record, read across 7K 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 city 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 Holly Average
Mount Holly Average
- ●USDA Zones 8a, averaged across Mount Holly
- ●One soil character for all of Mount Holly
- ●Frost dates read at Mount Holly's scale: Mar 16 to Nov 15
YOUR Parcel
- ✓Your exact zone, not Mount Holly's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mount Holly
Pull a site-specific report for your exact address in Mount Holly, North Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mount Holly averages can't show:
We read public map data around Mount Holly — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mount Holly average
How we know this about Mount Holly
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Mount Holly’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 city grain anywhere on this page — there is no city-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 Holly
When does frost risk typically end in Mount Holly?
The last hard freeze (28°F) in Mount Holly 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 Mount Holly?
The first hard freeze (28°F) in Mount Holly typically arrives around Nov 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 1, so the watching starts about Oct 16 — about 244 days after the spring freeze cleared.
How long is the growing season in Mount Holly?
Measured between 28°F hard freezes, Mount Holly sees about 244 frost-free days — roughly Mar 16 through Nov 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 6 to Nov 1, about 209 days.
Is the soil safe to grow vegetables in Mount Holly?
The federal record around Mount Holly runs heavier than most — 1,301 documented sites, mostly Underground Storage Tanks entries (796), the nearest Mining record about 0.3 miles 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 Holly?
From about Oct 16 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 15 (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 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mount Holly's scale — its 8a band and its 244-day season. Your yard writes its own version of Mount Holly'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 Holly’s own scale
7 of the readings below were taken at Mount Holly's own scale — its own ~244-day season between 28°F freezes, the 7,210 acres it covers and 1,301 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mount Holly's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Mount Holly's own 28°F hard-freeze dates, about Mar 16 and Nov 15 and the ~244-day span between themNOAA 1991–2020 Climate Normals
- 1,301 documented contamination sites on the federal record near Mount Holly, the closest Mining record about 0.3 miles out from the town centreFederal environmental registers
- Mount Holly's boundary and the 7,210 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~244-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mount Holly's own centroid, the PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Mount Hollylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mount Holly's 7,210 acres read through its county's SSURGO summaryfrom Gaston County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Gaston County
- The growing challenges every North Carolina grower plans around — written at state scale, so they stay on the state guidefrom North Carolina
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Gaston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mount Holly's 7,210 acreswhy one lot differs from the next →
- Which side of Mount Holly you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 7,210 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining record about 0.3 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 Mount Holly-wide figureread your own land →
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