North Grosvenor Dale, Connecticut, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, hazelnut, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in North Grosvenor Dale, 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 North Grosvenor Dale 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 North Grosvenor Dale — soil, climate, flood, and parcel records. How we handle your address.
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North Grosvenor Dale — the short answer
North Grosvenor Dale, Connecticut: USDA zone 6a, about 190 days between hard freezes, across 1K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 15
- 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
- ~190
- 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 North Grosvenor Dale's average, not your lot's — a low corner or a tree line moves it. Against North Grosvenor Dale's 190-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in North Grosvenor Dale
Each reading below is measured for North Grosvenor Dale itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorth Grosvenor Dale runs about 190 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
MeasuredNorth Grosvenor Dale 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 North Grosvenor Dale is in
North Grosvenor Dale sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at North Grosvenor Dale's own centroid rather than borrowed from Northeastern Connecticut Planning Region.
What Grows in North Grosvenor Dale
Every plant below cleared North Grosvenor Dale's own zone 6a and its 190-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in North Grosvenor Dale?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 15 (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. 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 North Grosvenor Dale
Spotted lanternfly documented 20 miles from North Grosvenor Dale, first recorded 2021. What to watch for.
What's on the federal record near North Grosvenor Dale
Closest first, within ~10 miles of North Grosvenor Dale. Listing isn't leaking, and distance isn't exposure.
- L. BLAIN, INC.Underground Storage Tanks · 800 ft
- CUMBERLAND FARMS #657Underground Storage Tanks · 1400 ft
- BATES AUTO PARTS INC.Underground Storage Tanks · 1400 ft
- NORTH GROSVENORDALE C.O. 7531Underground Storage Tanks · 1400 ft
- CARL'S SERVICE STATION, INC.Underground Storage Tanks · 1400 ft
- TRI STATE CITGOUnderground Storage Tanks · 1400 ft
- MORIN'S BOTTLED GAS , INC.Underground Storage Tanks · 1400 ft
- TRI-S ENVIRONMENTALBrownfields · 1500 ft
- SANITARY DASH MANUFACTURING COMPANY INCORPORATEDToxics Release Inventory · 1800 ft
- SANITARY DASH MANUFACTURING COMPANY INCORPORATEDBrownfields · 1800 ft
- MXI HHHWCBrownfields · 1.2 mi
- THOMPSON PUBLIC WORKS GARAGEUnderground Storage Tanks · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from North Grosvenor Dale'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 North Grosvenor Dale.
Total Sites
698
within ~10 miles of North Grosvenor Dale
Risk Level
Elevated
Highest-severity
15 Superfund sites
Sources Checked
within ~10 miles of North Grosvenor Dale
Severity Distribution
within ~10 miles of North Grosvenor Dale
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around North Grosvenor Dale, two things run higher than the national average within ~10 miles of North Grosvenor Dale — Superfund (15 sites) and Toxics Release Inventory (51 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 North Grosvenor Dale
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 North Grosvenor Dale average
Your land is one point inside North Grosvenor Dale
Everything above resolves to North Grosvenor Dale 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 North Grosvenor Dale Average
North Grosvenor Dale Average
- ●USDA Zones 6a, averaged across North Grosvenor Dale
- ●One soil character for all of North Grosvenor Dale
- ●Frost dates read at North Grosvenor Dale's scale: Apr 15 to Oct 22
YOUR Parcel
- ✓Your exact zone, not North Grosvenor Dale's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in North Grosvenor Dale
Pull a site-specific report for your exact address in North Grosvenor Dale, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that North Grosvenor Dale averages can't show:
We read public map data around North Grosvenor Dale — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the North Grosvenor Dale average
How we know this about North Grosvenor Dale
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 North Grosvenor Dale’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 North Grosvenor Dale
When does frost risk typically end in North Grosvenor Dale?
The last hard freeze (28°F) in North Grosvenor Dale typically lands around Apr 15, 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 6.
When is the first frost in North Grosvenor Dale?
The first hard freeze (28°F) in North Grosvenor Dale 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 190 days after the spring freeze cleared.
How long is the growing season in North Grosvenor Dale?
Measured between 28°F hard freezes, North Grosvenor Dale sees about 190 frost-free days — roughly Apr 15 through Oct 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 6 to Oct 8, about 155 days.
Is the soil safe to grow vegetables in North Grosvenor Dale?
The federal record around North Grosvenor Dale is a meaningful one — 698 documented sites, mostly Brownfields entries (283), the nearest Underground Storage Tanks record about 0.2 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 North Grosvenor Dale?
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 North Grosvenor Dale's scale — its 6a band and its 190-day season. Your yard writes its own version of North Grosvenor Dale'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 North Grosvenor Dale’s own scale
7 of the readings below were taken at North Grosvenor Dale's own scale — its own ~190-day season between 28°F freezes, the 1,450 acres it covers and 698 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- North Grosvenor Dale's own USDA hardiness band, zones 6aUSDA PHZM 2023
- North Grosvenor Dale's own 28°F hard-freeze dates, about Apr 15 and Oct 22 and the ~190-day span between themNOAA 1991–2020 Climate Normals
- 698 documented contamination sites on the federal record near North Grosvenor Dale, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- North Grosvenor Dale's boundary and the 1,450 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~190-day seasonGrowable Ground crop-matching engine
- The ecoregion at North Grosvenor Dale's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of North Grosvenor Dalelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so North Grosvenor Dale's 1,450 acres read through its county's SSURGO summaryfrom Northeastern Connecticut County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Northeastern 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 Northeastern Connecticut County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among North Grosvenor Dale's 1,450 acreswhy one lot differs from the next →
- Which side of North Grosvenor Dale you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,450 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 North Grosvenor Dale-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutNorth Grosvenor Dale sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides