Millboro, Virginia, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — cabbage, pawpaw, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Millboro, 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 Millboro 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 Millboro — soil, climate, flood, and parcel records. How we handle your address.
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Millboro — the short answer
Millboro, Virginia: USDA zone 7a, about 202 days between hard freezes, across 761 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~202
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 761 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 Millboro's average, not your lot's — a low corner or a tree line moves it. Against Millboro's 202-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Millboro
Each reading below is measured for Millboro itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMillboro runs about 202 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
MeasuredMillboro 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 Millboro is in
Millboro sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Millboro's own centroid rather than borrowed from Bath County.
What Grows in Millboro
Every plant below cleared Millboro's own zone 7a and its 202-day season. Each card opens that plant's Virginia profile. How we score.
Is it too late to plant in Millboro?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 27 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Millboro
Spotted lanternfly documented 14 miles from Millboro, first recorded 2023. What to watch for.
What's on the federal record near Millboro
Closest first, within ~10 miles of Millboro. Listing isn't leaking, and distance isn't exposure.
- BARC Electric CooperativeUnderground Storage Tanks · 250 ft
- HARDING JOSEPH J (JR )Underground Storage Tanks · 500 ft
- OLD MILLBORO ELEMENTARY SCHOOLUnderground Storage Tanks · 600 ft
- Millboro General StoreUnderground Storage Tanks · 1300 ft
- BACOVA GUILD LTDToxics Release Inventory · 2600 ft
- DOUTHAT ST PARKBrownfields · 0.5 mi
- BLUEGRASS WOODS INCBrownfields · 0.6 mi
- VDOT Millboro Area HeadquartersUnderground Storage Tanks · 1.3 mi
- Millboro Mercantile and GroceryUnderground Storage Tanks · 1.6 mi
- DEITZ HARDWARD & SUPPLYUnderground Storage Tanks · 1.6 mi
- DEITZ SHOPPING CENTERUnderground Storage Tanks · 1.6 mi
- IDAS PLACE / FORMERLY LAWRENCES STOREUnderground Storage Tanks · 3.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Millboro'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 Millboro.
Total Sites
27
within ~10 miles of Millboro
Risk Level
Low
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Millboro
Severity Distribution
within ~10 miles of Millboro
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Millboro, two things run higher than the national average within ~10 miles of Millboro — Toxics Release Inventory (3 sites) and Underground Storage Tanks (20 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Millboro
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 Millboro average
Your land is one point inside Millboro
Everything above resolves to Millboro as a whole — one PHZM band and one 28°F frost record, read across 761 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 Millboro Average
Millboro Average
- ●USDA Zones 7a, averaged across Millboro
- ●One soil character for all of Millboro
- ●Frost dates read at Millboro's scale: Apr 8 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Millboro's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Millboro
Pull a site-specific report for your exact address in Millboro, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Millboro averages can't show:
We read public map data around Millboro — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Millboro average
How we know this about Millboro
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 Millboro’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 Millboro
When does frost risk typically end in Millboro?
The last hard freeze (28°F) in Millboro typically lands around Apr 8, 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 29.
When is the first frost in Millboro?
The first hard freeze (28°F) in Millboro typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 202 days after the spring freeze cleared.
How long is the growing season in Millboro?
Measured between 28°F hard freezes, Millboro sees about 202 frost-free days — roughly Apr 8 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 13, about 167 days.
Is the soil safe to grow vegetables in Millboro?
The federal record around Millboro is light — 27 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (20), the nearest Underground Storage Tanks record under a tenth of a mile out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Millboro?
From about Sep 27 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 Oct 27 (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 Oct 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Millboro's scale — its 7a band and its 202-day season. Your yard writes its own version of Millboro'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 Millboro’s own scale
7 of the readings below were taken at Millboro's own scale — its own ~202-day season between 28°F freezes, the 761 acres it covers and 27 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Millboro's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Millboro's own 28°F hard-freeze dates, about Apr 8 and Oct 27 and the ~202-day span between themNOAA 1991–2020 Climate Normals
- 27 documented contamination sites on the federal record near Millboro, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Millboro's boundary and the 761 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~202-day seasonGrowable Ground crop-matching engine
- The ecoregion at Millboro's own centroid, the Ridge and ValleyUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Millborolydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Millboro's 761 acres read through its county's SSURGO summaryfrom Bath County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Bath 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 Bath County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Millboro's 761 acreswhy one lot differs from the next →
- Which side of Millboro you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 761 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 Millboro-wide figureread your own land →
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