New Preston, Connecticut, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in New Preston, 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 New Preston 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 New Preston — soil, climate, flood, and parcel records. How we handle your address.
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New Preston — the short answer
New Preston, Connecticut: USDA zone 6a, about 188 days between hard freezes, across 5K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~188
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 5K 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 New Preston's average, not your lot's — a low corner or a tree line moves it. Against New Preston's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in New Preston
Each reading below is measured for New Preston itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNew Preston runs about 188 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
MeasuredNew Preston 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 New Preston is in
New Preston sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at New Preston's own centroid rather than borrowed from Northwest Hills Planning Region.
What Grows in New Preston
Every plant below cleared New Preston's own zone 6a and its 188-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in New Preston?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 24 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Documented around New Preston
Spotted lanternfly documented 10 miles from New Preston, first recorded 2021. What to watch for.
What's on the federal record near New Preston
Closest first, within ~10 miles of New Preston. Listing isn't leaking, and distance isn't exposure.
- CT-WS 29Nitrate · 1.0 mi
- Debra WhalenUnderground Storage Tanks · 1.4 mi
- LAIDLAW TRANSITBrownfields · 1.6 mi
- KAIYA FARMBrownfields · 1.8 mi
- H&M GENERAL SERVICES, LLCBrownfields · 2.0 mi
- GARAGEUnderground Storage Tanks · 2.1 mi
- DOWLER'S GARAGEUnderground Storage Tanks · 2.2 mi
- RUMSEY HALL SCHOOLUnderground Storage Tanks · 2.3 mi
- NAZIA PROPERTIES, LLCUnderground Storage Tanks · 2.3 mi
- WASHINGTON TERMINALUnderground Storage Tanks · 3.2 mi
- WARREN TOWN GARAGEUnderground Storage Tanks · 3.4 mi
- BREEZY HILL FARMUnderground Storage Tanks · 3.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from New Preston'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 New Preston.
Total Sites
360
within ~10 miles of New Preston
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of New Preston
Severity Distribution
within ~10 miles of New Preston
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around New Preston, Nitrate runs higher than the national average — 106 sites within ~10 miles of New Preston. 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 New Preston
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 New Preston average
Your land is one point inside New Preston
Everything above resolves to New Preston as a whole — one PHZM band and one 28°F frost record, read across 5K 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 New Preston Average
New Preston Average
- ●USDA Zones 6a, averaged across New Preston
- ●One soil character for all of New Preston
- ●Frost dates read at New Preston's scale: Apr 19 to Oct 24
YOUR Parcel
- ✓Your exact zone, not New Preston's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in New Preston
Pull a site-specific report for your exact address in New Preston, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that New Preston averages can't show:
We read public map data around New Preston — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the New Preston average
How we know this about New Preston
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 New Preston’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 New Preston
When does frost risk typically end in New Preston?
The last hard freeze (28°F) in New Preston typically lands around Apr 19, 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 10.
When is the first frost in New Preston?
The first hard freeze (28°F) in New Preston typically arrives around Oct 24, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 10, so the watching starts about Sep 24 — about 188 days after the spring freeze cleared.
How long is the growing season in New Preston?
Measured between 28°F hard freezes, New Preston sees about 188 frost-free days — roughly Apr 19 through Oct 24, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 10 to Oct 10, about 153 days.
Is the soil safe to grow vegetables in New Preston?
The federal record around New Preston is a meaningful one — 360 documented sites, mostly Underground Storage Tanks entries (191), the nearest Nitrate record about 1.0 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 New Preston?
From about Sep 24 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 24 (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 24. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at New Preston's scale — its 6a band and its 188-day season. Your yard writes its own version of New Preston'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 New Preston’s own scale
7 of the readings below were taken at New Preston's own scale — its own ~188-day season between 28°F freezes, the 4,684 acres it covers and 360 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- New Preston's own USDA hardiness band, zones 6aUSDA PHZM 2023
- New Preston's own 28°F hard-freeze dates, about Apr 19 and Oct 24 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 360 documented contamination sites on the federal record near New Preston, the closest Nitrate record about 1.0 miles out from the town centreFederal environmental registers
- New Preston's boundary and the 4,684 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~188-day seasonGrowable Ground crop-matching engine
- The ecoregion at New Preston's own centroid, the Northeastern HighlandsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of New Prestonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so New Preston's 4,684 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 New Preston's 4,684 acreswhy one lot differs from the next →
- Which side of New Preston you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,684 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 1.0 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 New Preston-wide figureread your own land →