Chatham County, in Georgia, sits in USDA hardiness zone 9a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include artichoke, fig, california poppy, and cabbage, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Chatham County lies within the Sea Islands — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Chatham County holds more than one microclimate.
Soils and elevations shift across Chatham County, so your frost dates and drainage aren't the county average. 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 Chatham County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Chatham County — the short answer
Chatham County, Georgia: USDA zone 9a, about 304 days between hard freezes, across 277K acres.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 8
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Dec 9
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~304
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 277K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 9a is Chatham County's average, not your lot's — a low corner or a tree line moves it. Against Chatham County's 304-day season, see what your own ground reads.
Heat and winter chill in Chatham County
Across a year, Chatham County accumulates about 6,176 growing degree days above 50°F, about 761 more than the middle Georgia county — ahead of 136 of Georgia’s 159 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Winter banks about 607 hours below 45°F, 529 fewer than the Georgia middle of 1,136. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Chatham County
Across Chatham County, the ground is predominantly Ultisols, where Cape Fear, Ogeechee, and Ocilla are the most extensive named soil series. The soil is generally very poorly drained with a loamy fine sand surface. Topsoil pH runs about 4.8–5.5, strongly acidic. Rainfall drains through hydrologic group B/D soils.
Soil order
Ultisols
Drainage
Very poorly drained
Prime farmland
1%
Hydric soils
64%
Soil still varies lot by lot — soil types explained.
How the ground varies across Chatham County
The USDA soil survey maps 21% of Chatham County as very poorly drained — but another 39% drains differently: 18% poorly drained, 11% somewhat poorly drained.
Cape Fear is the most extensive named soil at 13% of mapped acres, then Ogeechee (12%) and Ocilla (11%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Chatham County
Each reading below is measured for Chatham County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Chatham County are very poorly drained, in hydrologic group B/D — ground that sheds water slowly.
Beds can stay saturated for days after heavy rain, and the roots of most vegetables, berries, and fruit trees suffocate or rot in soil that never drains.
Raised beds or mounded rows lift roots above the wet zone; choose water-tolerant crops for the lowest spots.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Chatham County runs about pH 4.8–5.5, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredChatham County runs about 304 days between hard freezes — 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
MeasuredChatham County 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 Chatham County is in
Chatham County sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Chatham County
We scored all 1,086 plants against Chatham County's own USDA zone 9a and its own 304-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Georgia profile.
Is it too late to plant in Chatham County?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 9 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
Documented around Chatham County
- monarch butterfly94 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Chatham County
USGS estimates 556 lb of Malathion on Chatham County farmland in 2019, its largest by weight, ahead of 2,4-d (497 lb) and Glyphosate (316 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Chatham County — and how to grow with it.
We checked the federal record across Chatham County — 1,285 documented sites across 6 of the 9 source types we track.
The most significant on record: 20 Superfund sites (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Chatham County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Chatham County
Closest first, across Chatham County. Listing isn't leaking, and distance isn't exposure.
- GLEN OF ROBIN HOODPFAS · 0 ft
- GOODYEAR ASCUnderground Storage Tanks · 0.7 mi
- GA ANG/117 TACTICAL CONTROL SQUAUnderground Storage Tanks · 0.7 mi
- BOAEN'S SANITARY SERVICEUnderground Storage Tanks · 0.7 mi
- WALMART SUPERCENTER #605Brownfields · 0.7 mi
- SAM'S CLUB #8202Brownfields · 0.7 mi
- SAMS CLUB #8202Underground Storage Tanks · 0.7 mi
- HUNTLEY JIFFY STORE #361Underground Storage Tanks · 0.7 mi
- SHELL #203Underground Storage Tanks · 0.7 mi
- PUMP N PANTRY #15Underground Storage Tanks · 0.7 mi
- CVS PHARMACY #7228Brownfields · 0.8 mi
- CHATHAM COUNTY FUEL STATIONUnderground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Chatham County'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 Chatham County.
Total Sites
1,285
across Chatham County
Risk Level
Elevated
Highest-severity
20 Superfund sites (none NPL-listed)
Sources Checked
across Chatham County
Severity Distribution
across Chatham County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Chatham County, two things run higher than the national average across Chatham County — PFAS (16 sites) and Superfund (20 sites). That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Chatham County
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 Chatham County average
Your land is one point inside Chatham County
Everything above resolves to Chatham County as a whole — one PHZM band and one county frost record, read across 277K 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 county 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 county average.
Your Lot vs the Chatham County Average
Chatham County Average
- ●USDA Zones 9a, averaged across Chatham County
- ●One soil character for all of Chatham County
- ●Frost dates read at Chatham County's scale: Feb 8 to Dec 9
YOUR Parcel
- ✓Your exact zone, not Chatham County's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Chatham County
Pull a site-specific report for your exact address in Chatham County, Georgia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Chatham County averages can't show:
We read public map data around Chatham County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Chatham County average
How we know this about Chatham County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Chatham County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Chatham County
When does frost risk typically end in Chatham County?
The last hard freeze (28°F) in Chatham County typically lands around Feb 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 Mar 1.
How long is the growing season in Chatham County?
Measured between 28°F hard freezes, Chatham County sees about 304 frost-free days — roughly Feb 8 through Dec 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 1 to Nov 25, about 269 days.
Is the soil safe to grow vegetables in Chatham County?
The federal record around Chatham County is a meaningful one — 1,285 documented sites, mostly Underground Storage Tanks entries (809), the nearest PFAS record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
Everything above is measured at Chatham County's scale — its 9a band and its 304-day season. Your yard writes its own version of Chatham County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Georgia's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Chatham County’s own scale
9 of the readings below were taken at Chatham County's own scale — its own ~304-day span between 28°F freezes, the 3 most extensive soil series mapped here and 1,285 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Chatham County's own USDA hardiness band, zones 9aUSDA PHZM 2023
- Chatham County's own 28°F hard-freeze dates and its ~304-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Chatham CountyUSDA NRCS SSURGO
- 1,285 documented contamination sites inside the county boundary, distance-sorted from its center — the closest PFAS record under a tenth of a mile outFederal environmental registers
- Chatham County's boundary and the 276,989 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~304-day seasonGrowable Ground crop-matching engine
- Chatham County sitting wholly inside the Southern Coastal PlainUS EPA Level III Ecoregions
- Open occurrence records documented in Chatham County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Chatham County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Georgia grower plans around — written at state scale, so they stay on the state guidefrom Georgia
What this page can’t tell you
- How the season shifts across Chatham County — the ~304 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Chatham County's 276,989 acreswhy one lot differs from the next →
- Which of those 1,285 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Chatham Countyread your own land →