Butler County, in Pennsylvania, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Well-matched crops include apple, tomato, grape, and mountain laurel, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Butler 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
Butler County holds more than one microclimate.
Soils and elevations shift across Butler County, so your frost dates and drainage aren't the county average. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Quick Facts
USDA Zones
6a
Last Hard Freeze (28°F)
Apr 1
County normal — light frosts run a few weeks later
First Hard Freeze (28°F)
Nov 16
County normal — light frosts arrive a few weeks earlier
County Area
505K acres
Hardiness Zone Range
Zone maps are averages across Butler County. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil in Butler County
Across Butler County, the ground is predominantly Ultisols, where Gilpin, Wharton, and Buchanan are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 4.8–5.6, strongly acidic. Rainfall drains through hydrologic group C soils.
Soil order
Ultisols
Drainage
Well drained
Prime farmland
16%
Hydric soils
13%
Soil still varies lot by lot — soil types explained.
What Grows in Butler County
Plants matched to Butler County's USDA zones 6a — each links to its full growing profile.
Is it too late to plant in Butler County?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 16 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Growing Challenges in Pennsylvania
What an experienced grower plans around here — each one has a move.
Rocky shale soils in the ridge-and-valley region
Build up over shale rather than into it — raised beds with imported soil give roots depth the ridge won't.
Short mountain seasons in the Poconos and Alleghenies
Mountain growers stretch the season with cold frames and fast varieties — the missing weeks are recoverable.
Deer pressure is among the highest in the US
In the hardest-hit deer country, a tall fence is the only reliable line — resistant plants cover the rest.
For cultivar selection, pest pressure, and planting-time guidance specific to Pennsylvania, the Penn State Extension is the authoritative local source.
Safe to Grow Here?
What the federal record shows across Butler County — and how to grow with it.
We checked the federal record across Butler County — 964 documented sites across 7 of the 9 source types we track.
The most significant on record: 3 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Butler County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Severity Distribution
across Butler County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Butler County, two things run higher than the national average — PFAS (12 sites) and Toxic Release Inventory (88 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxic Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Butler County
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Your Specific Parcel Matters
Butler County Average
- ●USDA Zones 6a
- ●Generic soil type for the area
- ●State-average frost dates
YOUR Parcel
- ✓Your exact hardiness zone
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Butler County
Pull a site-specific report for your exact address in Butler County, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Key Growing Facts for Butler County, Pennsylvania
- USDA Hardiness Zones: 6a (USDA PHZM 2023)
- Last Hard Freeze (28°F): Apr 1 (county normal, NOAA 1991–2020 Climate Normals — light frosts can follow for a few weeks)
- First Hard Freeze (28°F): Nov 16 (county normal, NOAA 1991–2020 Climate Normals — light frosts can arrive a few weeks earlier)
- Days Between Hard Freezes: ~229 (county normal, NOAA 1991–2020 Climate Normals)
- County Land Area: 505K acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. County boundaries: US Census TIGER/Line 2025.
Frost dates here are the Butler County average. Low spots and tree cover move them by days on any one yard — see your exact frost windows.
Frequently Asked Questions
What hardiness zone is Butler County, Pennsylvania?
Butler County sits in USDA hardiness zone 6a, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
Is it too late to plant in Butler County?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 16 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
When does frost risk typically end in Butler County?
The last hard freeze (28°F) in Butler County typically lands around Apr 1, per NOAA 1991–2020 climate normals — an earlier marker than the light-frost dates many planting charts quote. That marks the hard freeze, not the last light frost — light frosts can still bite for a few more weeks, so tender transplants usually wait another 2–3 weeks.
How long is the growing season in Butler County?
Measured between 28°F hard freezes, Butler County sees about 229 frost-free days — roughly Apr 1 through Nov 16, per NOAA 1991–2020 climate normals. Tender crops get a somewhat shorter practical window, since lighter frosts reach a few weeks past the hard-freeze dates on both ends.
What vegetables grow in Butler County?
Butler County's zone 6a supports a wide range — strong performers include Apple, Tomato, Grape, Mountain Laurel, and Mushroom. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Which hardiness zone is Butler County, really?
Officially, Butler County sits in USDA zone 6a (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
Is the soil safe to grow vegetables in Butler County?
The federal record around Butler County runs heavier than most — 964 documented sites — 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.
Just moved to Butler County — what should I know before planting?
Start with three facts. Butler County sits in USDA zone 6a, which sets what survives winter; the last 28°F hard freeze typically clears around Apr 1, with about 229 frost-free days to work with (NOAA 1991–2020 climate normals); and 964 documented sites sit on the federal record here, so a soil test before food beds is the smart first step. From there, matching plants to your actual soil and sun is the fun part.
Everything on this page is a Butler County average. Your yard writes its own version — 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.