Mill Hall, Pennsylvania, sits in USDA hardiness zone 6b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: cabbage, hazelnut, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Mill Hall, 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 Mill Hall 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 Mill Hall — soil, climate, flood, and parcel records. How we handle your address.
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Mill Hall — the short answer
Mill Hall, Pennsylvania: USDA zone 6b, about 196 days between hard freezes, across 589 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~196
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 589 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 6b is Mill Hall's average, not your lot's — a low corner or a tree line moves it. Against Mill Hall's 196-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mill Hall
Each reading below is measured for Mill Hall itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMill Hall runs about 196 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredMill Hall sits in USDA hardiness zone 6b.
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 Mill Hall is in
Mill Hall sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Mill Hall's own centroid, and it is not what its county reads: Clinton County is mostly North Central Appalachians. The wider page above you is answering a different question about different ground.
What Grows in Mill Hall
Every plant below cleared Mill Hall's own zone 6b and its 196-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Mill Hall?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Documented around Mill Hall
Spotted lanternfly documented 3 miles from Mill Hall, first recorded 2023. What to watch for.
What's on the federal record near Mill Hall
Closest first, within ~10 miles of Mill Hall. Listing isn't leaking, and distance isn't exposure.
- MILLER BROS. AUTO SALESBrownfields · 300 ft
- AEPUnderground Storage Tanks · 900 ft
- STAR GARAGEUnderground Storage Tanks · 900 ft
- TETCO SUSQUEHANNABrownfields · 1100 ft
- DANS GULF SVCUnderground Storage Tanks · 1100 ft
- UNI MART 04034Underground Storage Tanks · 1200 ft
- CONFERS SVC STAUnderground Storage Tanks · 1200 ft
- VALLEY OIL & GASUnderground Storage Tanks · 1200 ft
- WEBBS SUPER GRO PRODUnderground Storage Tanks · 1200 ft
- MILL HALL ELEM SCHUnderground Storage Tanks · 1500 ft
- CN 6Nitrate · 1600 ft
- BALD EAGLE NITTANY HIGH SCHUnderground Storage Tanks · 2500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Mill Hall'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 Mill Hall.
Sources Checked
within ~10 miles of Mill Hall
Severity Distribution
within ~10 miles of Mill Hall
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mill Hall, two things run higher than the national average within ~10 miles of Mill Hall — CAFO (4 sites) and Nitrate (94 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 Mill Hall
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 Mill Hall average
Your land is one point inside Mill Hall
Everything above resolves to Mill Hall as a whole — one PHZM band and one 28°F frost record, read across 589 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 Mill Hall Average
Mill Hall Average
- ●USDA Zones 6b, averaged across Mill Hall
- ●One soil character for all of Mill Hall
- ●Frost dates read at Mill Hall's scale: Apr 17 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Mill Hall's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mill Hall
Pull a site-specific report for your exact address in Mill Hall, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mill Hall averages can't show:
We read public map data around Mill Hall — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mill Hall average
How we know this about Mill Hall
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 Mill Hall’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 Mill Hall
When does frost risk typically end in Mill Hall?
The last hard freeze (28°F) in Mill Hall typically lands around Apr 17, 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 May 8.
When is the first frost in Mill Hall?
The first hard freeze (28°F) in Mill Hall typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 196 days after the spring freeze cleared.
How long is the growing season in Mill Hall?
Measured between 28°F hard freezes, Mill Hall sees about 196 frost-free days — roughly Apr 17 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 16, about 161 days.
Is the soil safe to grow vegetables in Mill Hall?
The federal record around Mill Hall is a meaningful one — 316 documented sites, mostly Underground Storage Tanks entries (148), the nearest Brownfields record under a tenth of a mile 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 Mill Hall?
From about Sep 30 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 Oct 30 (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 Oct 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mill Hall's scale — its 6b band and its 196-day season. Your yard writes its own version of Mill Hall'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 Mill Hall’s own scale
7 of the readings below were taken at Mill Hall's own scale — its own ~196-day season between 28°F freezes, the 589 acres it covers and 316 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mill Hall's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Mill Hall's own 28°F hard-freeze dates, about Apr 17 and Oct 30 and the ~196-day span between themNOAA 1991–2020 Climate Normals
- 316 documented contamination sites on the federal record near Mill Hall, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Mill Hall's boundary and the 589 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~196-day seasonGrowable Ground crop-matching engine
- Mill Hall sits in the Ridge and Valley — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Mill Halllydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mill Hall's 589 acres read through its county's SSURGO summaryfrom Clinton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Clinton 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 Clinton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mill Hall's 589 acreswhy one lot differs from the next →
- Which side of Mill Hall you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 589 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Mill Hall-wide figureread your own land →
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