Clearfield County, in Pennsylvania, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, blackberry, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Clearfield County lies within Appalachia — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Clearfield County holds more than one microclimate.
Soils and elevations shift across Clearfield County, so your frost dates and drainage aren't the county average. 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 Clearfield County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Clearfield County — the short answer
Clearfield County, Pennsylvania: USDA zone 6a, about 171 days between hard freezes, across 733K acres.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 18
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~171
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 733K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 6a is Clearfield County's average, not your lot's — a low corner or a tree line moves it. Against Clearfield County's 171-day season, see what your own ground reads.
Heat in Clearfield County
Across a year, Clearfield County accumulates about 2,286 growing degree days above 50°F, about 261 fewer than the middle Pennsylvania county — ahead of 17 of Pennsylvania’s 67 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Clearfield County
Across Clearfield County, the ground is predominantly Ultisols, where Hazleton, Rayne, and Gilpin are the most extensive named soil series. The soil is generally well drained with a channery silt loam surface. Topsoil pH runs about 4.5–5.2, very strongly acidic. Rainfall drains through hydrologic group C soils.
Soil order
Ultisols
Drainage
Well drained
Prime farmland
16%
Hydric soils
4%
Soil still varies lot by lot — soil types explained.
How the ground varies across Clearfield County
The USDA soil survey maps 64% of Clearfield County as well drained — but another 35% drains differently: 29% moderately well drained, 4% poorly drained.
Hazleton is the most extensive named soil at 14% of mapped acres, then Rayne (13%) and Gilpin (11%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Clearfield County
Each reading below is measured for Clearfield County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Clearfield County are well drained, in hydrologic group C — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Clearfield County runs about pH 4.5–5.2, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredClearfield County runs about 171 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
MeasuredClearfield County sits in USDA hardiness zone 6a.
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 Clearfield County is in
Clearfield County spans 2 EPA Level III ecoregions — Central Appalachians (69%) and North Central Appalachians (27%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Clearfield County
We scored all 1,086 plants against Clearfield County's own USDA zone 6a and its own 171-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Pennsylvania profile.
Is it too late to plant in Clearfield County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 18 — 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 Clearfield County
Spotted lanternfly documented 1 miles from Clearfield County, first recorded 2019. What to watch for.
- monarch butterfly113 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Clearfield County
USGS estimates 4,181 lb of Glyphosate on Clearfield County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (1,092 lb) and Atrazine (1,001 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Clearfield County — and how to grow with it.
We checked the federal record across Clearfield County — 668 documented sites across 6 of the 9 source types we track.
The most significant on record: 1 Superfund site (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Clearfield County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Clearfield County
Closest first, across Clearfield County. Listing isn't leaking, and distance isn't exposure.
- UNI MART 04003Underground Storage Tanks · 0.7 mi
- GEARHART EXCAVATINGUnderground Storage Tanks · 0.7 mi
- TMP ACQUISITIONS COBrownfields · 0.7 mi
- HYDE VOL FIRE COUnderground Storage Tanks · 0.8 mi
- CLEARFIELD CNTY MAINT BLDG 2 2Underground Storage Tanks · 0.9 mi
- SHANER ENERGY CLEARFIELDUnderground Storage Tanks · 0.9 mi
- CLEARFIELD CURWENSVILLE CCUnderground Storage Tanks · 1.0 mi
- CLEARFIELD PA ARMY NATIONAL GUARD RCBrownfields · 1.0 mi
- MANSUN BUS COUnderground Storage Tanks · 1.0 mi
- SWISHER CONCRETE PRODUCTSToxics Release Inventory · 1.1 mi
- KWIK FILL M0090 211Brownfields · 1.2 mi
- KWIK FILL M 90Underground Storage Tanks · 1.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clearfield County'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 Clearfield County.
Total Sites
668
across Clearfield County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Clearfield County
Severity Distribution
across Clearfield County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Clearfield County, PFAS runs higher than the national average — 6 sites across Clearfield County. That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Clearfield County
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 Clearfield County average
Your land is one point inside Clearfield County
Everything above resolves to Clearfield County as a whole — one PHZM band and one county frost record, read across 733K 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 county 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 county average.
Your Lot vs the Clearfield County Average
Clearfield County Average
- ●USDA Zones 6a, averaged across Clearfield County
- ●One soil character for all of Clearfield County
- ●Frost dates read at Clearfield County's scale: Apr 30 to Oct 18
YOUR Parcel
- ✓Your exact zone, not Clearfield County's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Clearfield County
Pull a site-specific report for your exact address in Clearfield County, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clearfield County averages can't show:
We read public map data around Clearfield County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clearfield County average
How we know this about Clearfield County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Clearfield County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Clearfield County
When does frost risk typically end in Clearfield County?
The last hard freeze (28°F) in Clearfield County typically lands around Apr 30, 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 21.
How long is the growing season in Clearfield County?
Measured between 28°F hard freezes, Clearfield County sees about 171 frost-free days — roughly Apr 30 through Oct 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Oct 4, about 136 days.
Is the soil safe to grow vegetables in Clearfield County?
The federal record around Clearfield County is a meaningful one — 668 documented sites, mostly Underground Storage Tanks entries (355), the nearest Underground Storage Tanks 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.
Everything above is measured at Clearfield County's scale — its 6a band and its 171-day season. Your yard writes its own version of Clearfield County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Pennsylvania's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Clearfield County’s own scale
9 of the readings below were taken at Clearfield County's own scale — its own ~171-day span between 28°F freezes, the 3 most extensive soil series mapped here and 668 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Clearfield County's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Clearfield County's own 28°F hard-freeze dates and its ~171-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Clearfield CountyUSDA NRCS SSURGO
- 668 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record about 0.7 miles outFederal environmental registers
- Clearfield County's boundary and the 732,838 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~171-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Clearfield County spans, Central Appalachians the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Clearfield County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Clearfield County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Pennsylvania grower plans around — written at state scale, so they stay on the state guidefrom Pennsylvania
What this page can’t tell you
- How the season shifts across Clearfield County — the ~171 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Clearfield County's 732,838 acreswhy one lot differs from the next →
- Which of those 668 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Clearfield Countyread your own land →