Middleburg, Florida, sits in USDA hardiness zone 9a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Among the crops suited to this profile: artichoke, fig, california poppy, and cabbage. The site-level story — soil, sun, drainage — decides the rest.
Even in Middleburg, 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 Middleburg 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 Middleburg — soil, climate, flood, and parcel records. How we handle your address.
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Middleburg — the short answer
Middleburg, Florida: USDA zone 9a, about 300 days between hard freezes, across 13K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 9
- Clay County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 6
- Clay County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~300
- Clay County normal — NOAA 1991–2020, nearest to this town
- Town area
- 13K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Clay County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Middleburg's average, not your lot's — a low corner or a tree line moves it. Against Middleburg's 300-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Middleburg
Each reading below is measured for Middleburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsMiddleburg runs about 300 days between hard freezes (read from Clay County, the closest normal to Middleburg) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredMiddleburg sits in USDA hardiness zone 9a.
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 Middleburg is in
Middleburg sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Middleburg's own centroid rather than borrowed from Clay County.
What Grows in Middleburg
Every plant below cleared Middleburg's own zone 9a and its 300-day season. Each card opens that plant's Florida profile. How we score.
Is it too late to plant in Middleburg?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 6 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Middleburg
Closest first, within ~10 miles of Middleburg. Listing isn't leaking, and distance isn't exposure.
- B & K FIBERGLASSBrownfields · 0.6 mi
- ISLANDS MECHANICAL CONTRACTORBrownfields · 0.6 mi
- R & S AUTO CENTERBrownfields · 0.8 mi
- CIRCLE K #2726016Underground Storage Tanks · 0.9 mi
- CIRCLE K #2726100Underground Storage Tanks · 0.9 mi
- CIRCLE K #2726290Underground Storage Tanks · 0.9 mi
- ALMA'S CRAFTSUnderground Storage Tanks · 0.9 mi
- BURGART ENTERPRISES BODY SHOPBrownfields · 0.9 mi
- MASTER LINKS INCUnderground Storage Tanks · 1.0 mi
- COLEMAN AUTO REPAIRBrownfields · 1.0 mi
- CIRCLE K #2726286Underground Storage Tanks · 1.0 mi
- SPRINT #6286Brownfields · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Middleburg'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 Middleburg.
Total Sites
149
within ~10 miles of Middleburg
Risk Level
Moderate
Highest-severity
4 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Middleburg
Severity Distribution
within ~10 miles of Middleburg
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 Middleburg
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 Middleburg average
Your land is one point inside Middleburg
Everything above resolves to Middleburg as a whole — one PHZM band, read across 13K acres, with hard-freeze dates borrowed from Clay County’s record because no 30-year normal resolves at this town’s own centroid. 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 Middleburg Average
Middleburg Average
- ●USDA Zones 9a, averaged across Middleburg
- ●One soil character for all of Middleburg
- ●Frost dates read at Middleburg's scale: Feb 9 to Dec 6
YOUR Parcel
- ✓Your exact zone, not Middleburg's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Middleburg
Pull a site-specific report for your exact address in Middleburg, Florida — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Middleburg averages can't show:
We read public map data around Middleburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Middleburg average
How we know this about Middleburg
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 Clay County’s record, because none resolves here; 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 Middleburg
When does frost risk typically end in Middleburg?
The last hard freeze (28°F) in Middleburg typically lands around Feb 9, 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 Mar 2.
When is the first frost in Middleburg?
The first hard freeze (28°F) in Middleburg typically arrives around Dec 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 22, so the watching starts about Nov 6 — about 300 days after the spring freeze cleared.
How long is the growing season in Middleburg?
Measured between 28°F hard freezes, Middleburg sees about 300 frost-free days — roughly Feb 9 through Dec 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 2 to Nov 22, about 265 days.
Is the soil safe to grow vegetables in Middleburg?
The federal record around Middleburg shows 149 documented sites, mostly Underground Storage Tanks entries (79), the nearest Brownfields record about 0.6 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Middleburg?
From about Nov 6 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 Dec 6 (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 Dec 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Middleburg's scale — its 9a band and its 300-day season. Your yard writes its own version of Middleburg'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 Middleburg’s own scale
5 of the readings below were taken at Middleburg's own scale — the 12,554 acres it covers and 149 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Middleburg's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 149 documented contamination sites on the federal record near Middleburg, the closest Brownfields record about 0.6 miles out from the town centreFederal environmental registers
- Middleburg's boundary and the 12,554 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~300-day seasonGrowable Ground crop-matching engine
- The ecoregion at Middleburg's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Middleburg has no normal of its own, so its county's is the closest measured readfrom Clay County
- Soil character — no town-scale survey exists, so Middleburg's 12,554 acres read through its county's SSURGO summaryfrom Clay County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Clay County
- The growing challenges every Florida grower plans around — written at state scale, so they stay on the state guidefrom Florida
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Clay County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Middleburg's 12,554 acreswhy one lot differs from the next →
- Which side of Middleburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 12,554 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.6 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 Middleburg-wide figureread your own land →
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