Port Royal, South Carolina, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — artichoke, fig, california poppy, and cabbage — with any one site's soil, sun, and drainage making the final cut.
Even in Port Royal, 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 Port Royal 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 Port Royal — soil, climate, flood, and parcel records. How we handle your address.
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Port Royal — the short answer
Port Royal, South Carolina: USDA zone 9a, about 317 days between hard freezes, across 11K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 3
- Beaufort County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 17
- Beaufort County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~317
- Beaufort County normal — NOAA 1991–2020, nearest to this town
- Town area
- 11K 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 Beaufort County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Port Royal's average, not your lot's — a low corner or a tree line moves it. Against Port Royal's 317-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Port Royal
Each reading below is measured for Port Royal itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsPort Royal runs about 317 days between hard freezes (read from Beaufort County, the closest normal to Port Royal) — 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
MeasuredPort Royal 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 Port Royal is in
Port Royal sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Port Royal's own centroid rather than borrowed from Beaufort County.
What Grows in Port Royal
Every plant below cleared Port Royal's own zone 9a and its 317-day season. Each card opens that plant's South Carolina profile. How we score.
Is it too late to plant in Port Royal?
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 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 17 — 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.
What's on the federal record near Port Royal
Closest first, within ~10 miles of Port Royal. Listing isn't leaking, and distance isn't exposure.
- PARRIS ISLAND MARINE CORPS RECRUIT DEPOTSuperfund · 1300 ft
- BFT- 11Nitrate · 0.7 mi
- BFT- 566Nitrate · 0.7 mi
- BFT- 102Nitrate · 1.4 mi
- PORT ROYAL SEAFOOD INCUnderground Storage Tanks · 1.5 mi
- US MARINE CORPS RECRUIT DEPOT PARRIS ISLANDBrownfields · 1.8 mi
- US MARINE CORPS RECRUIT DEPOT PARRIS ISLANDToxics Release Inventory · 1.8 mi
- BAY BEVERAGE DISTRIBUTORSUnderground Storage Tanks · 1.8 mi
- MCRD PARRIS ISLAND PV HYBRIDToxics Release Inventory · 1.8 mi
- RIBAUT RD SITEUnderground Storage Tanks · 1.8 mi
- BATTERY MARINA VILLAGE A SC LIMITED PARTNERSHIPUnderground Storage Tanks · 1.9 mi
- GENERAL WAREHOUSE COMPANY INCUnderground Storage Tanks · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Port Royal'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 Port Royal.
Sources Checked
within ~10 miles of Port Royal
Severity Distribution
within ~10 miles of Port Royal
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Port Royal, Superfund runs higher than the national average — 7 sites within ~10 miles of Port Royal. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Port Royal
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 Port Royal average
Your land is one point inside Port Royal
Everything above resolves to Port Royal as a whole — one PHZM band, read across 11K acres, with hard-freeze dates borrowed from Beaufort 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 Port Royal Average
Port Royal Average
- ●USDA Zones 9a, averaged across Port Royal
- ●One soil character for all of Port Royal
- ●Frost dates read at Port Royal's scale: Feb 3 to Dec 17
YOUR Parcel
- ✓Your exact zone, not Port Royal's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Port Royal
Pull a site-specific report for your exact address in Port Royal, South Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Port Royal averages can't show:
We read public map data around Port Royal — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Port Royal average
How we know this about Port Royal
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 Beaufort 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 Port Royal
When does frost risk typically end in Port Royal?
The last hard freeze (28°F) in Port Royal typically lands around Feb 3, 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 24.
When is the first frost in Port Royal?
The first hard freeze (28°F) in Port Royal typically arrives around Dec 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 3, so the watching starts about Nov 17 — about 317 days after the spring freeze cleared.
How long is the growing season in Port Royal?
Measured between 28°F hard freezes, Port Royal sees about 317 frost-free days — roughly Feb 3 through Dec 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 24 to Dec 3, about 282 days.
Is the soil safe to grow vegetables in Port Royal?
The federal record around Port Royal runs heavier than most — 387 documented sites, mostly Underground Storage Tanks entries (199), the nearest Superfund record about 0.2 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Port Royal?
From about Nov 17 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 17 (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 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Port Royal's scale — its 9a band and its 317-day season. Your yard writes its own version of Port Royal'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 Port Royal’s own scale
5 of the readings below were taken at Port Royal's own scale — the 10,883 acres it covers and 387 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Port Royal's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 387 documented contamination sites on the federal record near Port Royal, the closest Superfund record about 0.2 miles out from the town centreFederal environmental registers
- Port Royal's boundary and the 10,883 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~317-day seasonGrowable Ground crop-matching engine
- The ecoregion at Port Royal's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Port Royal has no normal of its own, so its county's is the closest measured readfrom Beaufort County
- Soil character — no town-scale survey exists, so Port Royal's 10,883 acres read through its county's SSURGO summaryfrom Beaufort County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Beaufort 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 Beaufort County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Port Royal's 10,883 acreswhy one lot differs from the next →
- Which side of Port Royal you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,883 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Superfund record about 0.2 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 Port Royal-wide figureread your own land →