Knollcrest, Connecticut, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Among the crops suited to this profile: cabbage, blackberry, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Knollcrest, 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 Knollcrest 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 Knollcrest — soil, climate, flood, and parcel records. How we handle your address.
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Knollcrest — the short answer
Knollcrest, Connecticut: USDA zone 6b, about 193 days between hard freezes, across 108 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~193
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 108 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 Knollcrest's average, not your lot's — a low corner or a tree line moves it. Against Knollcrest's 193-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Knollcrest
Each reading below is measured for Knollcrest itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredKnollcrest runs about 193 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
MeasuredKnollcrest 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 Knollcrest is in
Knollcrest sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at Knollcrest's own centroid rather than borrowed from Western Connecticut Planning Region.
What Grows in Knollcrest
Every plant below cleared Knollcrest's own zone 6b and its 193-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Knollcrest?
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 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 26 — 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 Knollcrest
Spotted lanternfly documented 4 miles from Knollcrest, first recorded 2022. What to watch for.
What's on the federal record near Knollcrest
Closest first, within ~10 miles of Knollcrest. Listing isn't leaking, and distance isn't exposure.
- BOGUS HILL COMMUNITYBrownfields · 0.5 mi
- CT-BD 11Nitrate · 1.6 mi
- CT-NMI 29Nitrate · 2.1 mi
- BROOKFIELD BAY MARINABrownfields · 2.1 mi
- CT-NFF 11Nitrate · 2.1 mi
- NEW FAIRFIELD AUTO SERVICE, INC.Underground Storage Tanks · 2.1 mi
- Pegmatite QuarryMining · 2.3 mi
- NEW MILFORD BLOCK & SUPPLY CORP.Underground Storage Tanks · 2.3 mi
- MODELVISION INCBrownfields · 2.5 mi
- BROOKFIELD DOT GARAGESuperfund · 2.5 mi
- CT-NFF 9Nitrate · 2.5 mi
- NEW FAIRFIELD AUTO BODYBrownfields · 2.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Knollcrest'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 Knollcrest.
Sources Checked
within ~10 miles of Knollcrest
Severity Distribution
within ~10 miles of Knollcrest
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Knollcrest, Superfund runs higher than the national average — 16 sites within ~10 miles of Knollcrest. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Knollcrest
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 Knollcrest average
Your land is one point inside Knollcrest
Everything above resolves to Knollcrest as a whole — one PHZM band and one 28°F frost record, read across 108 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 Knollcrest Average
Knollcrest Average
- ●USDA Zones 6b, averaged across Knollcrest
- ●One soil character for all of Knollcrest
- ●Frost dates read at Knollcrest's scale: Apr 16 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Knollcrest's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Knollcrest
Pull a site-specific report for your exact address in Knollcrest, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Knollcrest averages can't show:
We read public map data around Knollcrest — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Knollcrest average
How we know this about Knollcrest
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 Knollcrest’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 Knollcrest
When does frost risk typically end in Knollcrest?
The last hard freeze (28°F) in Knollcrest typically lands around Apr 16, 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 7.
When is the first frost in Knollcrest?
The first hard freeze (28°F) in Knollcrest typically arrives around Oct 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 12, so the watching starts about Sep 26 — about 193 days after the spring freeze cleared.
How long is the growing season in Knollcrest?
Measured between 28°F hard freezes, Knollcrest sees about 193 frost-free days — roughly Apr 16 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 7 to Oct 12, about 158 days.
Is the soil safe to grow vegetables in Knollcrest?
The federal record around Knollcrest is a meaningful one — 1,041 documented sites, mostly Underground Storage Tanks entries (507), the nearest Brownfields 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 Knollcrest?
From about Sep 26 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Knollcrest's scale — its 6b band and its 193-day season. Your yard writes its own version of Knollcrest'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 Knollcrest’s own scale
7 of the readings below were taken at Knollcrest's own scale — its own ~193-day season between 28°F freezes, the 108 acres it covers and 1,041 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Knollcrest's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Knollcrest's own 28°F hard-freeze dates, about Apr 16 and Oct 26 and the ~193-day span between themNOAA 1991–2020 Climate Normals
- 1,041 documented contamination sites on the federal record near Knollcrest, the closest Brownfields record about 0.5 miles out from the town centreFederal environmental registers
- Knollcrest's boundary and the 108 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~193-day seasonGrowable Ground crop-matching engine
- The ecoregion at Knollcrest's own centroid, the Northeastern HighlandsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Knollcrestlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Knollcrest's 108 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 Knollcrest's 108 acreswhy one lot differs from the next →
- Which side of Knollcrest you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 108 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Knollcrest-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutKnollcrest sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides