Cornwall Bridge, Connecticut, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Cornwall Bridge, 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 Cornwall Bridge 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 Cornwall Bridge — soil, climate, flood, and parcel records. How we handle your address.
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Cornwall Bridge — the short answer
Cornwall Bridge, Connecticut: USDA zone 6a, about 195 days between hard freezes, across 1K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~195
- 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 Cornwall Bridge's average, not your lot's — a low corner or a tree line moves it. Against Cornwall Bridge's 195-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cornwall Bridge
Each reading below is measured for Cornwall Bridge itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCornwall Bridge runs about 195 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
MeasuredCornwall Bridge 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 Cornwall Bridge is in
Cornwall Bridge sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at Cornwall Bridge's own centroid rather than borrowed from Northwest Hills Planning Region.
What Grows in Cornwall Bridge
Every plant below cleared Cornwall Bridge's own zone 6a and its 195-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Cornwall Bridge?
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 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — 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 Cornwall Bridge
Spotted lanternfly documented 10 miles from Cornwall Bridge, first recorded 2021. What to watch for.
What's on the federal record near Cornwall Bridge
Closest first, within ~10 miles of Cornwall Bridge. Listing isn't leaking, and distance isn't exposure.
- SHARON MAINTENANCE GARAGEUnderground Storage Tanks · 0.5 mi
- SCASCO INC - CORNWALL PLANTToxics Release Inventory · 1.0 mi
- CT-CRN 13Nitrate · 1.0 mi
- CORNWALL BRIDGE CITGOUnderground Storage Tanks · 1.1 mi
- LORCH FARMUnderground Storage Tanks · 1.1 mi
- LIANE DUNNUnderground Storage Tanks · 1.1 mi
- HOUSATONIC STATE PARKUnderground Storage Tanks · 2.0 mi
- CT-SR 14Nitrate · 2.2 mi
- CT-CRN 6Nitrate · 2.4 mi
- CT-WR 6Nitrate · 2.4 mi
- CT-SR 15Nitrate · 2.7 mi
- CT-SR 16Nitrate · 2.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Cornwall Bridge'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 Cornwall Bridge.
Total Sites
260
within ~10 miles of Cornwall Bridge
Risk Level
Elevated
Highest-severity
3 Superfund sites
Sources Checked
within ~10 miles of Cornwall Bridge
Severity Distribution
within ~10 miles of Cornwall Bridge
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cornwall Bridge, Nitrate runs higher than the national average — 108 sites within ~10 miles of Cornwall Bridge. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Cornwall Bridge
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 Cornwall Bridge average
Your land is one point inside Cornwall Bridge
Everything above resolves to Cornwall Bridge 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 Cornwall Bridge Average
Cornwall Bridge Average
- ●USDA Zones 6a, averaged across Cornwall Bridge
- ●One soil character for all of Cornwall Bridge
- ●Frost dates read at Cornwall Bridge's scale: Apr 17 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Cornwall Bridge's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cornwall Bridge
Pull a site-specific report for your exact address in Cornwall Bridge, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cornwall Bridge averages can't show:
We read public map data around Cornwall Bridge — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cornwall Bridge average
How we know this about Cornwall Bridge
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 Cornwall Bridge’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 Cornwall Bridge
When does frost risk typically end in Cornwall Bridge?
The last hard freeze (28°F) in Cornwall Bridge typically lands around Apr 17, 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 8.
When is the first frost in Cornwall Bridge?
The first hard freeze (28°F) in Cornwall Bridge typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 195 days after the spring freeze cleared.
How long is the growing season in Cornwall Bridge?
Measured between 28°F hard freezes, Cornwall Bridge sees about 195 frost-free days — roughly Apr 17 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 15, about 160 days.
Is the soil safe to grow vegetables in Cornwall Bridge?
The federal record around Cornwall Bridge is a meaningful one — 260 documented sites, mostly Underground Storage Tanks entries (117), the nearest Underground Storage Tanks record about 0.5 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 Cornwall Bridge?
From about Sep 29 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cornwall Bridge's scale — its 6a band and its 195-day season. Your yard writes its own version of Cornwall Bridge'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 Cornwall Bridge’s own scale
7 of the readings below were taken at Cornwall Bridge's own scale — its own ~195-day season between 28°F freezes, the 1,314 acres it covers and 260 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cornwall Bridge's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Cornwall Bridge's own 28°F hard-freeze dates, about Apr 17 and Oct 29 and the ~195-day span between themNOAA 1991–2020 Climate Normals
- 260 documented contamination sites on the federal record near Cornwall Bridge, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Cornwall Bridge's boundary and the 1,314 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~195-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cornwall Bridge's own centroid, the Northeastern HighlandsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Cornwall Bridgelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cornwall Bridge's 1,314 acres read through its county's SSURGO summaryfrom Northwest Hills County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Northwest Hills 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 Northwest Hills County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cornwall Bridge's 1,314 acreswhy one lot differs from the next →
- Which side of Cornwall Bridge you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,314 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Cornwall Bridge-wide figureread your own land →