James Island, South Carolina, 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.
On paper, artichoke, fig, california poppy, and cabbage all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in James Island, 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 James Island 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 James Island — soil, climate, flood, and parcel records. How we handle your address.
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James Island — the short answer
James Island, South Carolina: USDA zone 9a, about 320 days between hard freezes, across 3K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 1
- Charleston County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 18
- Charleston County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~320
- Charleston County normal — NOAA 1991–2020, nearest to this town
- Town area
- 3K 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 Charleston County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is James Island's average, not your lot's — a low corner or a tree line moves it. Against James Island's 320-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in James Island
Each reading below is measured for James Island itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsJames Island runs about 320 days between hard freezes (read from Charleston County, the closest normal to James Island) — 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
MeasuredJames Island 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 James Island is in
James Island sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at James Island's own centroid rather than borrowed from Charleston County.
What Grows in James Island
Every plant below cleared James Island's own zone 9a and its 320-day season. Each card opens that plant's South Carolina profile. How we score.
Is it too late to plant in James Island?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 18 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
Documented around James Island
Survey cells within 31 miles of James Island checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 157 miles off. What to watch for.
What's on the federal record near James Island
Closest first, within ~10 miles of James Island. Listing isn't leaking, and distance isn't exposure.
- COLONIAL RESTORATIONBrownfields · 1400 ft
- HARBORVIEW EXXONUnderground Storage Tanks · 2300 ft
- CVS PHARMACY 0483Brownfields · 2400 ft
- HARBORVIEW EXXON 46253Brownfields · 2500 ft
- CRICKET 3873Underground Storage Tanks · 2500 ft
- SOUTHERN BELL ISPLSCISUnderground Storage Tanks · 0.6 mi
- CORNER STOREUnderground Storage Tanks · 0.9 mi
- FREIBERGER PROPERTYUnderground Storage Tanks · 0.9 mi
- CHN- 143Nitrate · 1.2 mi
- FAST POINT 50Underground Storage Tanks · 1.3 mi
- DARLENES COUNTRY STOREUnderground Storage Tanks · 1.3 mi
- YANCY CO INCToxics Release Inventory · 1.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from James Island'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 James Island.
Total Sites
1,106
within ~10 miles of James Island
Risk Level
Elevated
Highest-severity
28 Superfund sites
Sources Checked
within ~10 miles of James Island
Severity Distribution
within ~10 miles of James Island
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around James Island, Superfund runs higher than the national average — 28 sites within ~10 miles of James Island. That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in James Island
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 James Island average
Your land is one point inside James Island
Everything above resolves to James Island as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Charleston 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 James Island Average
James Island Average
- ●USDA Zones 9a, averaged across James Island
- ●One soil character for all of James Island
- ●Frost dates read at James Island's scale: Feb 1 to Dec 18
YOUR Parcel
- ✓Your exact zone, not James Island's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in James Island
Pull a site-specific report for your exact address in James Island, South Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that James Island averages can't show:
We read public map data around James Island — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the James Island average
How we know this about James Island
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 Charleston 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 James Island
When does frost risk typically end in James Island?
The last hard freeze (28°F) in James Island typically lands around Feb 1, 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 22.
When is the first frost in James Island?
The first hard freeze (28°F) in James Island typically arrives around Dec 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 4, so the watching starts about Nov 18 — about 320 days after the spring freeze cleared.
How long is the growing season in James Island?
Measured between 28°F hard freezes, James Island sees about 320 frost-free days — roughly Feb 1 through Dec 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 22 to Dec 4, about 285 days.
Is the soil safe to grow vegetables in James Island?
The federal record around James Island is a meaningful one — 1,106 documented sites, mostly Underground Storage Tanks entries (648), the nearest Brownfields record about 0.3 miles 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.
How do I protect my plants from frost in James Island?
From about Nov 18 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 18 (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 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at James Island's scale — its 9a band and its 320-day season. Your yard writes its own version of James Island'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 James Island’s own scale
6 of the readings below were taken at James Island's own scale — the 3,098 acres it covers and 1,106 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- James Island's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 1,106 documented contamination sites on the federal record near James Island, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- James Island's boundary and the 3,098 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~320-day seasonGrowable Ground crop-matching engine
- The ecoregion at James Island's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
- Lanternfly survey cells around James Island checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — James Island has no normal of its own, so its county's is the closest measured readfrom Charleston County
- Soil character — no town-scale survey exists, so James Island's 3,098 acres read through its county's SSURGO summaryfrom Charleston County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Charleston County
- The growing challenges every South Carolina grower plans around — written at state scale, so they stay on the state guidefrom South Carolina
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Charleston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among James Island's 3,098 acreswhy one lot differs from the next →
- Which side of James Island you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,098 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 James Island-wide figureread your own land →