Ansonia, Connecticut, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Ansonia, 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 Ansonia 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 Ansonia — soil, climate, flood, and parcel records. How we handle your address.
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Ansonia — the short answer
Ansonia, Connecticut: USDA zone 6b, about 215 days between hard freezes, across 4K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~215
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K 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 Ansonia's average, not your lot's — a low corner or a tree line moves it. Against Ansonia's 215-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ansonia
Each reading below is measured for Ansonia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAnsonia runs about 215 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredAnsonia 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 Ansonia is in
Ansonia sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Ansonia's own centroid rather than borrowed from Naugatuck Valley Planning Region.
What Grows in Ansonia
Every plant below cleared Ansonia's own zone 6b and its 215-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Ansonia?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Ansonia
Spotted lanternfly documented 1 miles from Ansonia, first recorded 2022. What to watch for.
What's on the federal record near Ansonia
Closest first, within ~10 miles of Ansonia. Listing isn't leaking, and distance isn't exposure.
- ANSONIA HEAT & FUEL CO., INC.Underground Storage Tanks · 1500 ft
- BHCAREBrownfields · 2200 ft
- FITZPATRICK'S AUTOMOTIVEBrownfields · 2200 ft
- ANSONIA TIRE CENTERUnderground Storage Tanks · 2300 ft
- 241 MAIN LLCBrownfields · 2500 ft
- VALLEY CAR WASHUnderground Storage Tanks · 2500 ft
- WANTROBA FUELUnderground Storage Tanks · 2500 ft
- BILL'S GAS STATIONUnderground Storage Tanks · 2500 ft
- ANSONIA XPRESSMARTUnderground Storage Tanks · 2500 ft
- STOP & SHOP STORE #635Underground Storage Tanks · 2500 ft
- ANSONIA NIKE SITEUnderground Storage Tanks · 2500 ft
- EME, LLCUnderground Storage Tanks · 2500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Ansonia'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 Ansonia.
Sources Checked
within ~10 miles of Ansonia
Severity Distribution
within ~10 miles of Ansonia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Ansonia, two things run higher than the national average within ~10 miles of Ansonia — Superfund (28 sites) and Toxics Release Inventory (138 sites). That's not a problem with your land — it's information about 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 Ansonia
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 Ansonia average
Your land is one point inside Ansonia
Everything above resolves to Ansonia as a whole — one PHZM band and one 28°F frost record, read across 4K 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 city 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 Ansonia Average
Ansonia Average
- ●USDA Zones 6b, averaged across Ansonia
- ●One soil character for all of Ansonia
- ●Frost dates read at Ansonia's scale: Apr 4 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Ansonia's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ansonia
Pull a site-specific report for your exact address in Ansonia, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ansonia averages can't show:
We read public map data around Ansonia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ansonia average
How we know this about Ansonia
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Ansonia’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 city grain anywhere on this page — there is no city-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 Ansonia
When does frost risk typically end in Ansonia?
The last hard freeze (28°F) in Ansonia typically lands around Apr 4, 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 Apr 25.
When is the first frost in Ansonia?
The first hard freeze (28°F) in Ansonia typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 215 days after the spring freeze cleared.
How long is the growing season in Ansonia?
Measured between 28°F hard freezes, Ansonia sees about 215 frost-free days — roughly Apr 4 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 22, about 180 days.
Is the soil safe to grow vegetables in Ansonia?
The federal record around Ansonia is a meaningful one — 2,154 documented sites, mostly Underground Storage Tanks entries (1,070), the nearest Underground Storage Tanks record about 0.3 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 Ansonia?
From about Oct 6 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 Nov 5 (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 Nov 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ansonia's scale — its 6b band and its 215-day season. Your yard writes its own version of Ansonia'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 Ansonia’s own scale
7 of the readings below were taken at Ansonia's own scale — its own ~215-day season between 28°F freezes, the 3,852 acres it covers and 2,154 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Ansonia's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Ansonia's own 28°F hard-freeze dates, about Apr 4 and Nov 5 and the ~215-day span between themNOAA 1991–2020 Climate Normals
- 2,154 documented contamination sites on the federal record near Ansonia, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Ansonia's boundary and the 3,852 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~215-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ansonia's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Ansonialydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Ansonia's 3,852 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 Ansonia's 3,852 acreswhy one lot differs from the next →
- Which side of Ansonia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,852 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Ansonia-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutAnsonia sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides