Candlewood Isle, Connecticut, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, blackberry, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Candlewood Isle, 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 Candlewood Isle 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 Candlewood Isle — soil, climate, flood, and parcel records. How we handle your address.
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Candlewood Isle — the short answer
Candlewood Isle, Connecticut: USDA zone 6b, about 193 days between hard freezes, across 251 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
- 251 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 Candlewood Isle's average, not your lot's — a low corner or a tree line moves it. Against Candlewood Isle's 193-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Candlewood Isle
Each reading below is measured for Candlewood Isle itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCandlewood Isle 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
MeasuredCandlewood Isle 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 Candlewood Isle is in
Candlewood Isle sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at Candlewood Isle's own centroid rather than borrowed from Western Connecticut Planning Region.
What Grows in Candlewood Isle
Every plant below cleared Candlewood Isle'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 Candlewood Isle?
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 Candlewood Isle
Spotted lanternfly documented 4 miles from Candlewood Isle, first recorded 2022. What to watch for.
What's on the federal record near Candlewood Isle
Closest first, within ~10 miles of Candlewood Isle. Listing isn't leaking, and distance isn't exposure.
- CT-BD 11Nitrate · 0.9 mi
- BROOKFIELD BAY MARINABrownfields · 1.0 mi
- BOGUS HILL COMMUNITYBrownfields · 1.4 mi
- NEW FAIRFIELD AUTO SERVICE, INC.Underground Storage Tanks · 1.6 mi
- CT-BD 12Nitrate · 1.6 mi
- BROOKFIELD DOT GARAGESuperfund · 1.9 mi
- BROOKFIELD MAINTENANCE & REPAIR FACILITYUnderground Storage Tanks · 1.9 mi
- NEW MILFORD BLOCK & SUPPLY CORP.Underground Storage Tanks · 2.0 mi
- NEW FAIRFIELD AUTO BODYBrownfields · 2.0 mi
- WHITES APPLIANCESUnderground Storage Tanks · 2.0 mi
- CT-BD 6Nitrate · 2.0 mi
- TRIDENT ITW INDUSTRIAL INKJETToxics Release Inventory · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Candlewood Isle'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 Candlewood Isle.
Total Sites
1,090
within ~10 miles of Candlewood Isle
Risk Level
Elevated
Highest-severity
19 Superfund sites
Sources Checked
within ~10 miles of Candlewood Isle
Severity Distribution
within ~10 miles of Candlewood Isle
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Candlewood Isle, Superfund runs higher than the national average — 19 sites within ~10 miles of Candlewood Isle. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Candlewood Isle
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 Candlewood Isle average
Your land is one point inside Candlewood Isle
Everything above resolves to Candlewood Isle as a whole — one PHZM band and one 28°F frost record, read across 251 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 Candlewood Isle Average
Candlewood Isle Average
- ●USDA Zones 6b, averaged across Candlewood Isle
- ●One soil character for all of Candlewood Isle
- ●Frost dates read at Candlewood Isle's scale: Apr 16 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Candlewood Isle's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Candlewood Isle
Pull a site-specific report for your exact address in Candlewood Isle, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Candlewood Isle averages can't show:
We read public map data around Candlewood Isle — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Candlewood Isle average
How we know this about Candlewood Isle
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 Candlewood Isle’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 Candlewood Isle
When does frost risk typically end in Candlewood Isle?
The last hard freeze (28°F) in Candlewood Isle 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 Candlewood Isle?
The first hard freeze (28°F) in Candlewood Isle 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 Candlewood Isle?
Measured between 28°F hard freezes, Candlewood Isle 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 Candlewood Isle?
The federal record around Candlewood Isle is a meaningful one — 1,090 documented sites, mostly Underground Storage Tanks entries (521), the nearest Nitrate record about 0.9 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 Candlewood Isle?
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 Candlewood Isle's scale — its 6b band and its 193-day season. Your yard writes its own version of Candlewood Isle'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 Candlewood Isle’s own scale
7 of the readings below were taken at Candlewood Isle's own scale — its own ~193-day season between 28°F freezes, the 251 acres it covers and 1,090 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Candlewood Isle's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Candlewood Isle's own 28°F hard-freeze dates, about Apr 16 and Oct 26 and the ~193-day span between themNOAA 1991–2020 Climate Normals
- 1,090 documented contamination sites on the federal record near Candlewood Isle, the closest Nitrate record about 0.9 miles out from the town centreFederal environmental registers
- Candlewood Isle's boundary and the 251 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 Candlewood Isle's own centroid, the Northeastern HighlandsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Candlewood Islelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Candlewood Isle's 251 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 Candlewood Isle's 251 acreswhy one lot differs from the next →
- Which side of Candlewood Isle you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 251 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.9 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 Candlewood Isle-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutCandlewood Isle sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides