Terryville, Connecticut, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, hazelnut, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Terryville, 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 Terryville 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 Terryville — soil, climate, flood, and parcel records. How we handle your address.
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Terryville — the short answer
Terryville, Connecticut: USDA zone 6a, about 196 days between hard freezes, across 2K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~196
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Terryville's average, not your lot's — a low corner or a tree line moves it. Against Terryville's 196-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Terryville
Each reading below is measured for Terryville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTerryville 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
MeasuredTerryville 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 Terryville is in
Terryville sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Terryville's own centroid rather than borrowed from Naugatuck Valley Planning Region.
What Grows in Terryville
Every plant below cleared Terryville's own zone 6a and its 196-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Terryville?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 27 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
Documented around Terryville
Spotted lanternfly documented 5 miles from Terryville, first recorded 2023. What to watch for.
What's on the federal record near Terryville
Closest first, within ~10 miles of Terryville. Listing isn't leaking, and distance isn't exposure.
- WESTERN AUTO ST. SERVICE CENTERUnderground Storage Tanks · 300 ft
- PETIT'SUnderground Storage Tanks · 650 ft
- MC CALLUM DIE COMPANY INC.Underground Storage Tanks · 650 ft
- MAYFAIR GARAGE, INC.Underground Storage Tanks · 900 ft
- RITE AID 10378Brownfields · 950 ft
- VICS OIL & HEATINGUnderground Storage Tanks · 950 ft
- SUNOCO SERVICE STATIONBrownfields · 950 ft
- FURNICE SOURCE LLC THEBrownfields · 1000 ft
- TERRYVILLE PATCOUnderground Storage Tanks · 1200 ft
- DEFUNCT EAGLE LOCK CO.Underground Storage Tanks · 1300 ft
- PLYMOUTH MAINTENANCE GARAGE FACILITYUnderground Storage Tanks · 1400 ft
- PLYMOUTH MAINTENANCE GARAGEUnderground Storage Tanks · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Terryville'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 Terryville.
Sources Checked
within ~10 miles of Terryville
Severity Distribution
within ~10 miles of Terryville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Terryville, two things run higher than the national average within ~10 miles of Terryville — Superfund (56 sites) and Toxics Release Inventory (189 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Terryville
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 Terryville average
Your land is one point inside Terryville
Everything above resolves to Terryville as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Terryville Average
Terryville Average
- ●USDA Zones 6a, averaged across Terryville
- ●One soil character for all of Terryville
- ●Frost dates read at Terryville's scale: Apr 14 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Terryville's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Terryville
Pull a site-specific report for your exact address in Terryville, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Terryville averages can't show:
We read public map data around Terryville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Terryville average
How we know this about Terryville
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 Terryville’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 Terryville
When does frost risk typically end in Terryville?
The last hard freeze (28°F) in Terryville typically lands around Apr 14, 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 5.
When is the first frost in Terryville?
The first hard freeze (28°F) in Terryville typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 196 days after the spring freeze cleared.
How long is the growing season in Terryville?
Measured between 28°F hard freezes, Terryville sees about 196 frost-free days — roughly Apr 14 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 13, about 161 days.
Is the soil safe to grow vegetables in Terryville?
The federal record around Terryville runs heavier than most — 2,144 documented sites, mostly Underground Storage Tanks entries (1,062), the nearest Underground Storage Tanks record under a tenth of a mile out — 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.
How do I protect my plants from frost in Terryville?
From about Sep 27 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Terryville's scale — its 6a band and its 196-day season. Your yard writes its own version of Terryville'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 Terryville’s own scale
7 of the readings below were taken at Terryville's own scale — its own ~196-day season between 28°F freezes, the 1,767 acres it covers and 2,144 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Terryville's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Terryville's own 28°F hard-freeze dates, about Apr 14 and Oct 27 and the ~196-day span between themNOAA 1991–2020 Climate Normals
- 2,144 documented contamination sites on the federal record near Terryville, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Terryville's boundary and the 1,767 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~196-day seasonGrowable Ground crop-matching engine
- The ecoregion at Terryville's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Terryvillelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Terryville's 1,767 acres read through its county's SSURGO summaryfrom Naugatuck Valley County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Naugatuck Valley County
- The growing challenges every Connecticut grower plans around — written at state scale, so they stay on the state guidefrom Connecticut
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Naugatuck Valley County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Terryville's 1,767 acreswhy one lot differs from the next →
- Which side of Terryville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,767 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 Terryville-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutTerryville sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides