Norwich, Connecticut, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, hazelnut, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Norwich, 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 Norwich 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 Norwich — soil, climate, flood, and parcel records. How we handle your address.
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Norwich — the short answer
Norwich, Connecticut: USDA zone 6b, about 213 days between hard freezes, across 18K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 18K 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 Norwich's average, not your lot's — a low corner or a tree line moves it. Against Norwich's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Norwich
Each reading below is measured for Norwich itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorwich runs about 213 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
MeasuredNorwich 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 Norwich is in
Norwich sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Norwich's own centroid rather than borrowed from Southeastern Connecticut Planning Region.
What Grows in Norwich
Every plant below cleared Norwich's own zone 6b and its 213-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Norwich?
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 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Norwich
Spotted lanternfly documented 2 miles from Norwich, first recorded 2022. What to watch for.
What's on the federal record near Norwich
Closest first, within ~10 miles of Norwich. Listing isn't leaking, and distance isn't exposure.
- NORWICH HOSPITALUnderground Storage Tanks · 650 ft
- GOODYEAR AUTO SERVICE CENTERUnderground Storage Tanks · 700 ft
- GOODYEAR AUTO SERV CTRBrownfields · 800 ft
- Ammys Food MartUnderground Storage Tanks · 850 ft
- GRIMES CLEANERS OF NORWICH INCBrownfields · 950 ft
- Stop & Shop Supermarket Co., LLC Store #615Underground Storage Tanks · 1200 ft
- FW WEBB CO NORWICH CT BRANCHBrownfields · 1800 ft
- THE WILLIAM W. BACKUS HOSPITALBrownfields · 1800 ft
- THE WILLIAM W. BACKUS HOSPITALUnderground Storage Tanks · 2000 ft
- AGWAY, INC.Underground Storage Tanks · 2400 ft
- SAM'S FOOD STOREUnderground Storage Tanks · 0.5 mi
- MATLACK, INC.Underground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Norwich'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 Norwich.
Total Sites
647
within ~10 miles of Norwich
Risk Level
Elevated
Highest-severity
7 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Norwich
Severity Distribution
within ~10 miles of Norwich
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Norwich
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 Norwich average
Your land is one point inside Norwich
Everything above resolves to Norwich as a whole — one PHZM band and one 28°F frost record, read across 18K 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 Norwich Average
Norwich Average
- ●USDA Zones 6b, averaged across Norwich
- ●One soil character for all of Norwich
- ●Frost dates read at Norwich's scale: Mar 31 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Norwich's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Norwich
Pull a site-specific report for your exact address in Norwich, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Norwich averages can't show:
We read public map data around Norwich — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Norwich average
How we know this about Norwich
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 Norwich’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 Norwich
When does frost risk typically end in Norwich?
The last hard freeze (28°F) in Norwich typically lands around Mar 31, 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 21.
When is the first frost in Norwich?
The first hard freeze (28°F) in Norwich typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 213 days after the spring freeze cleared.
How long is the growing season in Norwich?
Measured between 28°F hard freezes, Norwich sees about 213 frost-free days — roughly Mar 31 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 16, about 178 days.
Is the soil safe to grow vegetables in Norwich?
The federal record around Norwich is a meaningful one — 647 documented sites, mostly Underground Storage Tanks entries (335), the nearest Underground Storage Tanks 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 Norwich?
From about Sep 30 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 30 (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 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Norwich's scale — its 6b band and its 213-day season. Your yard writes its own version of Norwich'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 Norwich’s own scale
7 of the readings below were taken at Norwich's own scale — its own ~213-day season between 28°F freezes, the 17,961 acres it covers and 647 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Norwich's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Norwich's own 28°F hard-freeze dates, about Mar 31 and Oct 30 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 647 documented contamination sites on the federal record near Norwich, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Norwich's boundary and the 17,961 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Norwich's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Norwichlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Norwich's 17,961 acres read through its county's SSURGO summaryfrom Southeastern Connecticut County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Southeastern Connecticut 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 Southeastern Connecticut County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Norwich's 17,961 acreswhy one lot differs from the next →
- Which side of Norwich you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 17,961 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Norwich-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutNorwich sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides