Louisa, Virginia, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
On paper, cabbage, hazelnut, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Louisa, 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 Louisa 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 Louisa — soil, climate, flood, and parcel records. How we handle your address.
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Louisa — the short answer
Louisa, Virginia: USDA zone 7a, about 217 days between hard freezes, across 1K 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 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~217
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Louisa's average, not your lot's — a low corner or a tree line moves it. Against Louisa's 217-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Louisa
Each reading below is measured for Louisa itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLouisa runs about 217 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
MeasuredLouisa 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 Louisa is in
Louisa sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Louisa's own centroid rather than borrowed from Louisa County.
What Grows in Louisa
Every plant below cleared Louisa's own zone 7a and its 217-day season. Each card opens that plant's Virginia profile. How we score.
Is it too late to plant in Louisa?
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 3 — 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 Louisa
Spotted lanternfly documented 14 miles from Louisa, first recorded 2023. What to watch for.
What's on the federal record near Louisa
Closest first, within ~10 miles of Louisa. Listing isn't leaking, and distance isn't exposure.
- TRACTOR SUPPLY #1980Brownfields · 1600 ft
- LOUISA WATER GAS EMERGENCY RESPONSESuperfund · 1700 ft
- LOUISA MACHINE & WELDING SHOPUnderground Storage Tanks · 1700 ft
- AVR LOUISA PARTNERSHIPUnderground Storage Tanks · 1700 ft
- TRIANGLE PLAZAUnderground Storage Tanks · 1700 ft
- VDOT ROWUnderground Storage Tanks · 1700 ft
- Louisa Boat and Motor Sales and ServiceUnderground Storage Tanks · 1800 ft
- WALGREENS #10923Brownfields · 1900 ft
- TOWN OF LOUISAUnderground Storage Tanks · 1900 ft
- OLD LOUISA EXXONUnderground Storage Tanks · 1900 ft
- PETTIT BROTHERS GULFUnderground Storage Tanks · 1900 ft
- FRANKS SELF SERVICEUnderground Storage Tanks · 1900 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Louisa'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 Louisa.
Total Sites
135
within ~10 miles of Louisa
Risk Level
High
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Louisa
Severity Distribution
within ~10 miles of Louisa
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Louisa, two things run higher than the national average within ~10 miles of Louisa — Mining (25 sites) and Underground Storage Tanks (88 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Louisa
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 Louisa average
Your land is one point inside Louisa
Everything above resolves to Louisa as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Louisa Average
Louisa Average
- ●USDA Zones 7a, averaged across Louisa
- ●One soil character for all of Louisa
- ●Frost dates read at Louisa's scale: Mar 31 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Louisa's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Louisa
Pull a site-specific report for your exact address in Louisa, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Louisa averages can't show:
We read public map data around Louisa — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Louisa average
How we know this about Louisa
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 Louisa’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 Louisa
When does frost risk typically end in Louisa?
The last hard freeze (28°F) in Louisa 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 Louisa?
The first hard freeze (28°F) in Louisa typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 217 days after the spring freeze cleared.
How long is the growing season in Louisa?
Measured between 28°F hard freezes, Louisa sees about 217 frost-free days — roughly Mar 31 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 20, about 182 days.
Is the soil safe to grow vegetables in Louisa?
The federal record around Louisa runs heavier than most — 135 documented sites, mostly Underground Storage Tanks entries (88), the nearest Brownfields 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 Louisa?
From about Oct 4 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 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 Nov 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Louisa's scale — its 7a band and its 217-day season. Your yard writes its own version of Louisa'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 Louisa’s own scale
7 of the readings below were taken at Louisa's own scale — its own ~217-day season between 28°F freezes, the 1,163 acres it covers and 135 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Louisa's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Louisa's own 28°F hard-freeze dates, about Mar 31 and Nov 3 and the ~217-day span between themNOAA 1991–2020 Climate Normals
- 135 documented contamination sites on the federal record near Louisa, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Louisa's boundary and the 1,163 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~217-day seasonGrowable Ground crop-matching engine
- The ecoregion at Louisa's own centroid, the PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Louisalydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Louisa's 1,163 acres read through its county's SSURGO summaryfrom Louisa County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Louisa County
- The growing challenges every Virginia grower plans around — written at state scale, so they stay on the state guidefrom Virginia
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Louisa County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Louisa's 1,163 acreswhy one lot differs from the next →
- Which side of Louisa you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,163 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Louisa-wide figureread your own land →
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