Clemson, South Carolina, sits in USDA hardiness zone 8a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Clemson, 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 Clemson 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 Clemson — soil, climate, flood, and parcel records. How we handle your address.
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Clemson — the short answer
Clemson, South Carolina: USDA zone 8a, about 248 days between hard freezes, across 5K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 15
- Pickens County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 18
- Pickens County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~248
- Pickens County normal — NOAA 1991–2020, nearest to this town
- City area
- 5K 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 Pickens County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8a is Clemson's average, not your lot's — a low corner or a tree line moves it. Against Clemson's 248-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Clemson
Each reading below is measured for Clemson itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsClemson runs about 248 days between hard freezes (read from Pickens County, the closest normal to Clemson) — 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
MeasuredClemson sits in USDA hardiness zone 8a.
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 Clemson is in
Clemson sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Clemson's own centroid rather than borrowed from Pickens County.
What Grows in Clemson
Every plant below cleared Clemson's own zone 8a and its 248-day season. Each card opens that plant's South Carolina profile. How we score.
Is it too late to plant in Clemson?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 18 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Clemson
Closest first, within ~10 miles of Clemson. Listing isn't leaking, and distance isn't exposure.
- PRISMA HEALTH PEDIATRICS- CLEMSONBrownfields · 1700 ft
- 93 QUICK STOPUnderground Storage Tanks · 1800 ft
- FOODMART 4Underground Storage Tanks · 1800 ft
- C L MARTINS EXXONUnderground Storage Tanks · 2000 ft
- CLEMSON CITY OF (SC3910004)PFAS · 2300 ft
- PUBLIX SUPERMARKET 1379 GATEWAY VILLAGEBrownfields · 2400 ft
- CLEMSON SECTION SHEDUnderground Storage Tanks · 2500 ft
- TIGER MARTUnderground Storage Tanks · 2600 ft
- SC-93 & KELLY RD SITE NEUnderground Storage Tanks · 0.5 mi
- LITTLE GENERAL 617Underground Storage Tanks · 0.5 mi
- KELLEY BP STATIONUnderground Storage Tanks · 0.6 mi
- BUD KELLY BPUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clemson'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 Clemson.
Total Sites
436
within ~10 miles of Clemson
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Clemson
Severity Distribution
within ~10 miles of Clemson
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Clemson, two things run higher than the national average within ~10 miles of Clemson — PFAS (6 sites) and Toxics Release Inventory (29 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Clemson
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 Clemson average
Your land is one point inside Clemson
Everything above resolves to Clemson as a whole — one PHZM band, read across 5K acres, with hard-freeze dates borrowed from Pickens County’s record because no 30-year normal resolves at this city’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 city 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 Clemson Average
Clemson Average
- ●USDA Zones 8a, averaged across Clemson
- ●One soil character for all of Clemson
- ●Frost dates read at Clemson's scale: Mar 15 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Clemson's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Clemson
Pull a site-specific report for your exact address in Clemson, South Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clemson averages can't show:
We read public map data around Clemson — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clemson average
How we know this about Clemson
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Pickens 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 city grain anywhere on this page — there is no city-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 Clemson
When does frost risk typically end in Clemson?
The last hard freeze (28°F) in Clemson typically lands around Mar 15, 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 5.
When is the first frost in Clemson?
The first hard freeze (28°F) in Clemson typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 248 days after the spring freeze cleared.
How long is the growing season in Clemson?
Measured between 28°F hard freezes, Clemson sees about 248 frost-free days — roughly Mar 15 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 5 to Nov 4, about 213 days.
Is the soil safe to grow vegetables in Clemson?
The federal record around Clemson is a meaningful one — 436 documented sites, mostly Underground Storage Tanks entries (273), 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 Clemson?
From about Oct 19 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 Nov 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 Nov 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Clemson's scale — its 8a band and its 248-day season. Your yard writes its own version of Clemson'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 Clemson’s own scale
5 of the readings below were taken at Clemson's own scale — the 5,084 acres it covers and 436 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Clemson's own USDA hardiness band, zones 8aUSDA PHZM 2023
- 436 documented contamination sites on the federal record near Clemson, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Clemson's boundary and the 5,084 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~248-day seasonGrowable Ground crop-matching engine
- The ecoregion at Clemson's own centroid, the PiedmontUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Clemson has no normal of its own, so its county's is the closest measured readfrom Pickens County
- Soil character — no town-scale survey exists, so Clemson's 5,084 acres read through its county's SSURGO summaryfrom Pickens County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pickens 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 Pickens County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Clemson's 5,084 acreswhy one lot differs from the next →
- Which side of Clemson you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,084 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 Clemson-wide figureread your own land →