Harlem, Florida, sits in USDA hardiness zone 10a — a zone band wide enough that plant choice, not possibility, is the interesting question.
On paper, okra, meyer lemon, california poppy, and artichoke all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Harlem, 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 Harlem 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 Harlem — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Harlem — the short answer
Harlem, Florida: USDA zone 10a, about 329 days between hard freezes, across 673 acres of town.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 25
- Hendry County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 20
- Hendry County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~329
- Hendry County normal — NOAA 1991–2020, nearest to this town
- Town area
- 673 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 Hendry County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Harlem's average, not your lot's — a low corner or a tree line moves it. Against Harlem's 329-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Harlem
Each reading below is measured for Harlem itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsHarlem runs about 329 days between hard freezes (read from Hendry County, the closest normal to Harlem) — 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
MeasuredHarlem sits in USDA hardiness zone 10a.
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 Harlem is in
Harlem sits in the Southern Florida Coastal Plain — EPA Level III, inside the wider Tropical Wet Forests. That is read at Harlem's own centroid, and it is not what its county reads: Hendry County is mostly Southern Coastal Plain. The wider page above you is answering a different question about different ground.
What Grows in Harlem
Every plant below cleared Harlem's own zone 10a and its 329-day season. Each card opens that plant's Florida profile. How we score.
Is it too late to plant in Harlem?
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 Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 20 — 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 Harlem
Closest first, within ~10 miles of Harlem. Listing isn't leaking, and distance isn't exposure.
- K&J FOOD STOREUnderground Storage Tanks · 1400 ft
- HARLEMUnderground Storage Tanks · 1700 ft
- S -1240Nitrate · 0.6 mi
- CLEWISTON GOLF COURSEBrownfields · 0.8 mi
- U.S. SUGAR CORPORATIONToxics Release Inventory · 0.8 mi
- CLEWISTON SUGAR HOUSEBrownfields · 0.9 mi
- CLEWISTON SUGAR HOUSEToxics Release Inventory · 0.9 mi
- CLEWISTON CITY PUBLIC WORKS DEPTBrownfields · 1.0 mi
- S -1235Nitrate · 1.1 mi
- S -1213Nitrate · 1.1 mi
- CLEWISTON CITY-GARAGEUnderground Storage Tanks · 1.2 mi
- WALMART SUPERCENTER #2484Brownfields · 1.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Harlem'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 Harlem.
Total Sites
148
within ~10 miles of Harlem
Risk Level
Moderate
Highest-severity
9 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Harlem
Severity Distribution
within ~10 miles of Harlem
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 Harlem
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 Harlem average
Your land is one point inside Harlem
Everything above resolves to Harlem as a whole — one PHZM band, read across 673 acres, with hard-freeze dates borrowed from Hendry 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 Harlem Average
Harlem Average
- ●USDA Zones 10a, averaged across Harlem
- ●One soil character for all of Harlem
- ●Frost dates read at Harlem's scale: Jan 25 to Dec 20
YOUR Parcel
- ✓Your exact zone, not Harlem's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Harlem
Pull a site-specific report for your exact address in Harlem, Florida — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Harlem averages can't show:
We read public map data around Harlem — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Harlem average
How we know this about Harlem
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 Hendry 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 Harlem
When does frost risk typically end in Harlem?
The last hard freeze (28°F) in Harlem typically lands around Jan 25, 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 Feb 15.
When is the first frost in Harlem?
The first hard freeze (28°F) in Harlem typically arrives around Dec 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 6, so the watching starts about Nov 20 — about 329 days after the spring freeze cleared.
How long is the growing season in Harlem?
Measured between 28°F hard freezes, Harlem sees about 329 frost-free days — roughly Jan 25 through Dec 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 15 to Dec 6, about 294 days.
Is the soil safe to grow vegetables in Harlem?
The federal record around Harlem shows 148 documented sites, mostly Underground Storage Tanks entries (56), the nearest Underground Storage Tanks record about 0.3 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 Harlem?
From about Nov 20 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Harlem's scale — its 10a band and its 329-day season. Your yard writes its own version of Harlem'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 Harlem’s own scale
5 of the readings below were taken at Harlem's own scale — the 673 acres it covers and 148 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Harlem's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 148 documented contamination sites on the federal record near Harlem, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Harlem's boundary and the 673 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~329-day seasonGrowable Ground crop-matching engine
- Harlem sits in the Southern Florida Coastal Plain — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Harlem has no normal of its own, so its county's is the closest measured readfrom Hendry County
- Soil character — no town-scale survey exists, so Harlem's 673 acres read through its county's SSURGO summaryfrom Hendry County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hendry 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 Hendry County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Harlem's 673 acreswhy one lot differs from the next →
- Which side of Harlem you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 673 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Harlem-wide figureread your own land →