Rock Hill, Louisiana, 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.
Reliable performers under these conditions include artichoke, fig, california poppy, and cabbage; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Rock Hill, 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 Rock Hill 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 Rock Hill — soil, climate, flood, and parcel records. How we handle your address.
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Rock Hill — the short answer
Rock Hill, Louisiana: USDA zone 9a, about 289 days between hard freezes, across 2K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 16
- Grant Parish normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 2
- Grant Parish normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~289
- Grant Parish normal — NOAA 1991–2020, nearest to this town
- Town area
- 2K 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 Grant Parish’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Rock Hill's average, not your lot's — a low corner or a tree line moves it. Against Rock Hill's 289-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rock Hill
Each reading below is measured for Rock Hill itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsRock Hill runs about 289 days between hard freezes (read from Grant Parish, the closest normal to Rock Hill) — 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
MeasuredRock Hill 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 Rock Hill is in
Rock Hill sits in the South Central Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rock Hill's own centroid rather than borrowed from Grant Parish.
What Grows in Rock Hill
Every plant below cleared Rock Hill's own zone 9a and its 289-day season. Each card opens that plant's Louisiana profile. How we score.
Is it too late to plant in Rock Hill?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 2 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near Rock Hill
Closest first, within ~10 miles of Rock Hill. Listing isn't leaking, and distance isn't exposure.
- G-249Nitrate · 0.7 mi
- R & R OIL COBrownfields · 0.8 mi
- G-353Nitrate · 1.9 mi
- Tiger TraxxUnderground Storage Tanks · 1.9 mi
- G-388BNitrate · 2.1 mi
- G-388ANitrate · 2.1 mi
- DOLLAR GENERAL STORE #23202Brownfields · 2.2 mi
- Sparrows GroceryUnderground Storage Tanks · 2.2 mi
- G-387Nitrate · 2.3 mi
- G-230Nitrate · 2.6 mi
- G-294Nitrate · 2.7 mi
- G-64Nitrate · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rock Hill'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 Rock Hill.
Total Sites
473
within ~10 miles of Rock Hill
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Rock Hill
Severity Distribution
within ~10 miles of Rock Hill
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rock Hill, Nitrate runs higher than the national average — 274 sites within ~10 miles of Rock Hill. That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Rock Hill
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 Rock Hill average
Your land is one point inside Rock Hill
Everything above resolves to Rock Hill as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Grant Parish’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 Rock Hill Average
Rock Hill Average
- ●USDA Zones 9a, averaged across Rock Hill
- ●One soil character for all of Rock Hill
- ●Frost dates read at Rock Hill's scale: Feb 16 to Dec 2
YOUR Parcel
- ✓Your exact zone, not Rock Hill's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rock Hill
Pull a site-specific report for your exact address in Rock Hill, Louisiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rock Hill averages can't show:
We read public map data around Rock Hill — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rock Hill average
How we know this about Rock Hill
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 Grant Parish’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 Rock Hill
When does frost risk typically end in Rock Hill?
The last hard freeze (28°F) in Rock Hill typically lands around Feb 16, 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 9.
When is the first frost in Rock Hill?
The first hard freeze (28°F) in Rock Hill typically arrives around Dec 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 18, so the watching starts about Nov 2 — about 289 days after the spring freeze cleared.
How long is the growing season in Rock Hill?
Measured between 28°F hard freezes, Rock Hill sees about 289 frost-free days — roughly Feb 16 through Dec 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 9 to Nov 18, about 254 days.
Is the soil safe to grow vegetables in Rock Hill?
The federal record around Rock Hill is a meaningful one — 473 documented sites, mostly Nitrate entries (274), the nearest Nitrate record about 0.7 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 Rock Hill?
From about Nov 2 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 2 (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 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rock Hill's scale — its 9a band and its 289-day season. Your yard writes its own version of Rock Hill'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 Rock Hill’s own scale
5 of the readings below were taken at Rock Hill's own scale — the 2,466 acres it covers and 473 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Rock Hill's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 473 documented contamination sites on the federal record near Rock Hill, the closest Nitrate record about 0.7 miles out from the town centreFederal environmental registers
- Rock Hill's boundary and the 2,466 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~289-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rock Hill's own centroid, the South Central PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Rock Hill has no normal of its own, so its county's is the closest measured readfrom Grant Parish
- Soil character — no town-scale survey exists, so Rock Hill's 2,466 acres read through its county's SSURGO summaryfrom Grant County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Grant County
- The growing challenges every Louisiana grower plans around — written at state scale, so they stay on the state guidefrom Louisiana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Grant County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rock Hill's 2,466 acreswhy one lot differs from the next →
- Which side of Rock Hill you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,466 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.7 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 Rock Hill-wide figureread your own land →
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