Rockhill, Pennsylvania, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
A short list that earns its place here — cabbage, hazelnut, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Rockhill, 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 Rockhill 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 Rockhill — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Rockhill — the short answer
Rockhill, Pennsylvania: USDA zone 7a, about 212 days between hard freezes, across 186 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~212
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 186 acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 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 7a is Rockhill's average, not your lot's — a low corner or a tree line moves it. Against Rockhill's 212-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rockhill
Each reading below is measured for Rockhill itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRockhill runs about 212 days between hard freezes — 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
MeasuredRockhill sits in USDA hardiness zone 7a.
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 Rockhill is in
Rockhill sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rockhill's own centroid rather than borrowed from Huntingdon County.
What Grows in Rockhill
Every plant below cleared Rockhill's own zone 7a and its 212-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Rockhill?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Rockhill
Spotted lanternfly documented 2 miles from Rockhill, first recorded 2021. What to watch for.
What's on the federal record near Rockhill
Closest first, within ~10 miles of Rockhill. Listing isn't leaking, and distance isn't exposure.
- ROCKHILL ELEMUnderground Storage Tanks · 75 ft
- C BLACK PETRO STA 8Underground Storage Tanks · 1300 ft
- MARTIN GEN STORE 228Underground Storage Tanks · 1800 ft
- MARTIN OIL CO MARTIN GENERAL STOREBrownfields · 2000 ft
- GEORGE H VIENER SVC CTRUnderground Storage Tanks · 2300 ft
- SANDY RIDGE EXPRESSUnderground Storage Tanks · 2500 ft
- ORBISONIA QUARRYUnderground Storage Tanks · 1.9 mi
- KEITHS SUNOCOUnderground Storage Tanks · 1.9 mi
- HU 278Nitrate · 1.9 mi
- HU 282Nitrate · 2.7 mi
- HU 277Nitrate · 3.0 mi
- SHIRLEYSBURG GARAGEUnderground Storage Tanks · 3.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rockhill'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 Rockhill.
Total Sites
107
within ~10 miles of Rockhill
Risk Level
Moderate
Highest-severity
4 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Rockhill
Severity Distribution
within ~10 miles of Rockhill
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rockhill, two things run higher than the national average within ~10 miles of Rockhill — CAFO (9 sites) and Nitrate (34 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Rockhill
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 Rockhill average
Your land is one point inside Rockhill
Everything above resolves to Rockhill as a whole — one PHZM band and one 28°F frost record, read across 186 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 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 Rockhill Average
Rockhill Average
- ●USDA Zones 7a, averaged across Rockhill
- ●One soil character for all of Rockhill
- ●Frost dates read at Rockhill's scale: Apr 6 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Rockhill's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rockhill
Pull a site-specific report for your exact address in Rockhill, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rockhill averages can't show:
We read public map data around Rockhill — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rockhill average
How we know this about Rockhill
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 Rockhill’s own record; 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 Rockhill
When does frost risk typically end in Rockhill?
The last hard freeze (28°F) in Rockhill typically lands around Apr 6, 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 27.
When is the first frost in Rockhill?
The first hard freeze (28°F) in Rockhill typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 212 days after the spring freeze cleared.
How long is the growing season in Rockhill?
Measured between 28°F hard freezes, Rockhill sees about 212 frost-free days — roughly Apr 6 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 27 to Oct 21, about 177 days.
Is the soil safe to grow vegetables in Rockhill?
The federal record around Rockhill shows 107 documented sites, mostly Underground Storage Tanks entries (49), the nearest Underground Storage Tanks record under a tenth of a mile out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Rockhill?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rockhill's scale — its 7a band and its 212-day season. Your yard writes its own version of Rockhill'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 Rockhill’s own scale
7 of the readings below were taken at Rockhill's own scale — its own ~212-day season between 28°F freezes, the 186 acres it covers and 107 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rockhill's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Rockhill's own 28°F hard-freeze dates, about Apr 6 and Nov 4 and the ~212-day span between themNOAA 1991–2020 Climate Normals
- 107 documented contamination sites on the federal record near Rockhill, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Rockhill's boundary and the 186 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~212-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rockhill's own centroid, the Ridge and ValleyUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Rockhilllydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rockhill's 186 acres read through its county's SSURGO summaryfrom Huntingdon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Huntingdon County
- The growing challenges every Pennsylvania grower plans around — written at state scale, so they stay on the state guidefrom Pennsylvania
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Huntingdon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rockhill's 186 acreswhy one lot differs from the next →
- Which side of Rockhill you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 186 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Rockhill-wide figureread your own land →
More in Pennsylvania
Growing region
Nearby growing guides