Broad Brook, Connecticut, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Broad Brook, 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 Broad Brook 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 Broad Brook — soil, climate, flood, and parcel records. How we handle your address.
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Broad Brook — the short answer
Broad Brook, Connecticut: USDA zone 6b, about 211 days between hard freezes, across 4K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~211
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K 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 Broad Brook's average, not your lot's — a low corner or a tree line moves it. Against Broad Brook's 211-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Broad Brook
Each reading below is measured for Broad Brook itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBroad Brook runs about 211 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
MeasuredBroad Brook 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 Broad Brook is in
Broad Brook sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Broad Brook's own centroid rather than borrowed from Capitol Planning Region.
What Grows in Broad Brook
Every plant below cleared Broad Brook's own zone 6b and its 211-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Broad Brook?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Broad Brook
Spotted lanternfly documented 3 miles from Broad Brook, first recorded 2022. What to watch for.
What's on the federal record near Broad Brook
Closest first, within ~10 miles of Broad Brook. Listing isn't leaking, and distance isn't exposure.
- TOWN OF EASTE WINDSOR HHHWCBrownfields · 1300 ft
- TOWN OF EAST WINDSOR HHHWCBrownfields · 1300 ft
- KEMENT PARK LANDFILLSuperfund · 1300 ft
- CT-EW 94Nitrate · 1300 ft
- CASCO, INC.Underground Storage Tanks · 2200 ft
- 15 CHAMBERLAIN RDUnderground Storage Tanks · 2200 ft
- CABRAL OIL CO INCUnderground Storage Tanks · 2200 ft
- EAST WINDSOR OLD TOWN GARAGEUnderground Storage Tanks · 2200 ft
- HERB HOLDEN TRUCKING INCUnderground Storage Tanks · 2200 ft
- BOUTIN & SONS CONST CO INCUnderground Storage Tanks · 2200 ft
- HASTILLO FARMSUnderground Storage Tanks · 2200 ft
- HALL & MUSKA, INC.Underground Storage Tanks · 2200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Broad Brook'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 Broad Brook.
Sources Checked
within ~10 miles of Broad Brook
Severity Distribution
within ~10 miles of Broad Brook
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Broad Brook, Superfund runs higher than the national average — 28 sites within ~10 miles of Broad Brook. 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 Broad Brook
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 Broad Brook average
Your land is one point inside Broad Brook
Everything above resolves to Broad Brook as a whole — one PHZM band and one 28°F frost record, read across 4K 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 Broad Brook Average
Broad Brook Average
- ●USDA Zones 6b, averaged across Broad Brook
- ●One soil character for all of Broad Brook
- ●Frost dates read at Broad Brook's scale: Apr 4 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Broad Brook's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Broad Brook
Pull a site-specific report for your exact address in Broad Brook, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Broad Brook averages can't show:
We read public map data around Broad Brook — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Broad Brook average
How we know this about Broad Brook
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 Broad Brook’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 Broad Brook
When does frost risk typically end in Broad Brook?
The last hard freeze (28°F) in Broad Brook typically lands around Apr 4, 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 25.
When is the first frost in Broad Brook?
The first hard freeze (28°F) in Broad Brook typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 211 days after the spring freeze cleared.
How long is the growing season in Broad Brook?
Measured between 28°F hard freezes, Broad Brook sees about 211 frost-free days — roughly Apr 4 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 18, about 176 days.
Is the soil safe to grow vegetables in Broad Brook?
The federal record around Broad Brook is a meaningful one — 1,963 documented sites, mostly Underground Storage Tanks entries (887), 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 Broad Brook?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Broad Brook's scale — its 6b band and its 211-day season. Your yard writes its own version of Broad Brook'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 Broad Brook’s own scale
7 of the readings below were taken at Broad Brook's own scale — its own ~211-day season between 28°F freezes, the 3,792 acres it covers and 1,963 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Broad Brook's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Broad Brook's own 28°F hard-freeze dates, about Apr 4 and Nov 1 and the ~211-day span between themNOAA 1991–2020 Climate Normals
- 1,963 documented contamination sites on the federal record near Broad Brook, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Broad Brook's boundary and the 3,792 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~211-day seasonGrowable Ground crop-matching engine
- The ecoregion at Broad Brook's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Broad Brooklydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Broad Brook's 3,792 acres read through its county's SSURGO summaryfrom Capitol County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Capitol 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 Capitol County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Broad Brook's 3,792 acreswhy one lot differs from the next →
- Which side of Broad Brook you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,792 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 Broad Brook-wide figureread your own land →