Berwick, Maine, 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.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Berwick, 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 Berwick 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 Berwick — soil, climate, flood, and parcel records. How we handle your address.
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Berwick — the short answer
Berwick, Maine: USDA zone 6a, about 186 days between hard freezes, across 1K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~186
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 6a is Berwick's average, not your lot's — a low corner or a tree line moves it. Against Berwick's 186-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Berwick
Each reading below is measured for Berwick itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBerwick runs about 186 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
MeasuredBerwick 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 Berwick is in
Berwick sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Berwick's own centroid rather than borrowed from York County.
What Grows in Berwick
Every plant below cleared Berwick's own zone 6a and its 186-day season. Each card opens that plant's Maine profile. How we score.
Is it too late to plant in Berwick?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 22 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Berwick
Spotted lanternfly documented 18 miles from Berwick, first recorded 2022. What to watch for.
What's on the federal record near Berwick
Closest first, within ~10 miles of Berwick. Listing isn't leaking, and distance isn't exposure.
- CUMBERLAND FARMS #1817Brownfields · 700 ft
- CUMBERLAND FARMS INC 1817Underground Storage Tanks · 800 ft
- PRIME TANNING CO INCUnderground Storage Tanks · 1000 ft
- PRIME TANNING COMPANY, INCToxics Release Inventory · 1000 ft
- GATEWAY GAS INCUnderground Storage Tanks · 1500 ft
- TURCOTTE CONCRETE FLOORS INCUnderground Storage Tanks · 1900 ft
- ROULEAUS AUTO REPAIRUnderground Storage Tanks · 2500 ft
- GREEN VALLEY 55236 FRM GETTYUnderground Storage Tanks · 2600 ft
- PUBLIC LIBRARYUnderground Storage Tanks · 0.5 mi
- SOMERSWORTH WATER TRT FACILITYUnderground Storage Tanks · 0.6 mi
- BERWICK PUBLIC WORKSUnderground Storage Tanks · 0.6 mi
- HILLTOP FAMILY PRACTICEBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Berwick'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 Berwick.
Sources Checked
within ~10 miles of Berwick
Severity Distribution
within ~10 miles of Berwick
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Berwick, two things run higher than the national average within ~10 miles of Berwick — Toxics Release Inventory (48 sites) and PFAS (5 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Berwick
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 Berwick average
Your land is one point inside Berwick
Everything above resolves to Berwick as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Berwick Average
Berwick Average
- ●USDA Zones 6a, averaged across Berwick
- ●One soil character for all of Berwick
- ●Frost dates read at Berwick's scale: Apr 19 to Oct 22
YOUR Parcel
- ✓Your exact zone, not Berwick's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Berwick
Pull a site-specific report for your exact address in Berwick, Maine — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Berwick averages can't show:
We read public map data around Berwick — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Berwick average
How we know this about Berwick
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 Berwick’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 Berwick
When does frost risk typically end in Berwick?
The last hard freeze (28°F) in Berwick typically lands around Apr 19, 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 10.
When is the first frost in Berwick?
The first hard freeze (28°F) in Berwick typically arrives around Oct 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 8, so the watching starts about Sep 22 — about 186 days after the spring freeze cleared.
How long is the growing season in Berwick?
Measured between 28°F hard freezes, Berwick sees about 186 frost-free days — roughly Apr 19 through Oct 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 10 to Oct 8, about 151 days.
Is the soil safe to grow vegetables in Berwick?
The federal record around Berwick is a meaningful one — 602 documented sites, mostly Underground Storage Tanks entries (301), the nearest Brownfields record about 0.1 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 Berwick?
From about Sep 22 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Berwick's scale — its 6a band and its 186-day season. Your yard writes its own version of Berwick'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 Berwick’s own scale
7 of the readings below were taken at Berwick's own scale — its own ~186-day season between 28°F freezes, the 1,007 acres it covers and 602 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Berwick's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Berwick's own 28°F hard-freeze dates, about Apr 19 and Oct 22 and the ~186-day span between themNOAA 1991–2020 Climate Normals
- 602 documented contamination sites on the federal record near Berwick, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Berwick's boundary and the 1,007 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~186-day seasonGrowable Ground crop-matching engine
- The ecoregion at Berwick's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Berwicklydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Berwick's 1,007 acres read through its county's SSURGO summaryfrom York County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom York County
- The growing challenges every Maine grower plans around — written at state scale, so they stay on the state guidefrom Maine
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom York County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Berwick's 1,007 acreswhy one lot differs from the next →
- Which side of Berwick you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,007 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Berwick-wide figureread your own land →
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