Noroton Heights, Connecticut, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Noroton Heights, 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 Noroton Heights 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 Noroton Heights — soil, climate, flood, and parcel records. How we handle your address.
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Noroton Heights — the short answer
Noroton Heights, Connecticut: USDA zone 7a, about 237 days between hard freezes, across 561 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 561 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 7a is Noroton Heights's average, not your lot's — a low corner or a tree line moves it. Against Noroton Heights's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Noroton Heights
Each reading below is measured for Noroton Heights itself — here is what it means for a garden here, and the move an experienced grower makes about it.

Season length
MeasuredNoroton Heights runs about 237 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
MeasuredNoroton Heights sits in USDA hardiness zone 7a.
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 Noroton Heights is in
Noroton Heights sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Noroton Heights's own centroid rather than borrowed from Western Connecticut Planning Region.
What Grows in Noroton Heights
Every plant below cleared Noroton Heights's own zone 7a and its 237-day season. Each card opens that plant's Connecticut profile. How we score.






























Is it too late to plant in Noroton Heights?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 22 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Noroton Heights
Spotted lanternfly documented 2 miles from Noroton Heights, first recorded 2020. What to watch for.
What's on the federal record near Noroton Heights
Closest first, within ~10 miles of Noroton Heights. Listing isn't leaking, and distance isn't exposure.
- BEN HIRSCHLERBrownfields · 900 ft
- NOROTON HEIGHTS RR STATIONBrownfields · 1700 ft
- DARIEN FABRICARE CENTER INCBrownfields · 1700 ft
- CLEAN HARBORSBrownfields · 1800 ft
- Global Montello Group #5961Underground Storage Tanks · 2000 ft
- LINDEN CLEANERS, INC.Underground Storage Tanks · 2100 ft
- STOP & SHOP #626Underground Storage Tanks · 2100 ft
- MOBIL OIL CORP SERV STA G5JBrownfields · 2200 ft
- ALLIANCE ENERGY LLC# 839Underground Storage Tanks · 0.6 mi
- DARIEN AUTO BODYBrownfields · 0.7 mi
- Ray’s Mirror Shine LLCUnderground Storage Tanks · 0.8 mi
- DARIEN HIGH SCHOOLUnderground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Noroton Heights'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 Noroton Heights.
Total Sites
1,414
within ~10 miles of Noroton Heights
Risk Level
Elevated
Highest-severity
15 Superfund sites
Sources Checked
within ~10 miles of Noroton Heights
Severity Distribution
within ~10 miles of Noroton Heights
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 Noroton Heights
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 Noroton Heights average
Your land is one point inside Noroton Heights
Everything above resolves to Noroton Heights as a whole — one PHZM band and one 28°F frost record, read across 561 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 Noroton Heights Average
Noroton Heights Average
- ●USDA Zones 7a, averaged across Noroton Heights
- ●One soil character for all of Noroton Heights
- ●Frost dates read at Noroton Heights's scale: Mar 30 to Nov 22
YOUR Parcel
- ✓Your exact zone, not Noroton Heights's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Noroton Heights
Pull a site-specific report for your exact address in Noroton Heights, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Noroton Heights averages can't show:
We read public map data around Noroton Heights — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Noroton Heights average
How we know this about Noroton Heights
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 Noroton Heights’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 Noroton Heights
When does frost risk typically end in Noroton Heights?
The last hard freeze (28°F) in Noroton Heights typically lands around Mar 30, 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 20.
When is the first frost in Noroton Heights?
The first hard freeze (28°F) in Noroton Heights typically arrives around Nov 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 8, so the watching starts about Oct 23 — about 237 days after the spring freeze cleared.
How long is the growing season in Noroton Heights?
Measured between 28°F hard freezes, Noroton Heights sees about 237 frost-free days — roughly Mar 30 through Nov 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Nov 8, about 202 days.
Is the soil safe to grow vegetables in Noroton Heights?
The federal record around Noroton Heights is a meaningful one — 1,414 documented sites, mostly Underground Storage Tanks entries (721), the nearest Brownfields 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 Noroton Heights?
From about Oct 23 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 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 Nov 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Noroton Heights's scale — its 7a band and its 237-day season. Your yard writes its own version of Noroton Heights'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 Noroton Heights’s own scale
7 of the readings below were taken at Noroton Heights's own scale — its own ~237-day season between 28°F freezes, the 561 acres it covers and 1,414 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Noroton Heights's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Noroton Heights's own 28°F hard-freeze dates, about Mar 30 and Nov 22 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 1,414 documented contamination sites on the federal record near Noroton Heights, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Noroton Heights's boundary and the 561 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~237-day seasonGrowable Ground crop-matching engine
- The ecoregion at Noroton Heights's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Noroton Heightslydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Noroton Heights's 561 acres read through its county's SSURGO summaryfrom Western Connecticut County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Western 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 Western Connecticut County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Noroton Heights's 561 acreswhy one lot differs from the next →
- Which side of Noroton Heights you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 561 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Noroton Heights-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutNoroton Heights sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides
