Suffield Depot, Connecticut, sits in USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Suffield Depot, 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 Suffield Depot 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 Suffield Depot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Suffield Depot — the short answer
Suffield Depot, Connecticut: USDA zone 6b, about 211 days between hard freezes, across 1K 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
- 1K 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 Suffield Depot's average, not your lot's — a low corner or a tree line moves it. Against Suffield Depot's 211-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Suffield Depot
Each reading below is measured for Suffield Depot itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSuffield Depot 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
MeasuredSuffield Depot 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 Suffield Depot is in
Suffield Depot sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Suffield Depot's own centroid rather than borrowed from Capitol Planning Region.
What Grows in Suffield Depot
Every plant below cleared Suffield Depot'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 Suffield Depot?
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. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Suffield Depot
Spotted lanternfly documented 7 miles from Suffield Depot, first recorded 2020. What to watch for.
What's on the federal record near Suffield Depot
Closest first, within ~10 miles of Suffield Depot. Listing isn't leaking, and distance isn't exposure.
- BRIAN MOTORSUnderground Storage Tanks · 0.7 mi
- TOWN OF SUFFIELDBrownfields · 0.8 mi
- SAINT JOSEPHS CHURCHUnderground Storage Tanks · 0.9 mi
- SHAMROCK CLEANERSBrownfields · 0.9 mi
- SUFFIELD BOOSTER #2Underground Storage Tanks · 1.0 mi
- STEVENSON SUFFIELD, INC.Underground Storage Tanks · 1.0 mi
- CVS PHARMACY #2022Brownfields · 1.0 mi
- EUGENE GREGORYUnderground Storage Tanks · 1.0 mi
- JAMES & EVELYN PORTERUnderground Storage Tanks · 1.0 mi
- EXECUTIVE VALET PARKINGUnderground Storage Tanks · 1.0 mi
- ZERA FARMSUnderground Storage Tanks · 1.0 mi
- FOOD BAG #519Underground Storage Tanks · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Suffield Depot'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 Suffield Depot.
Total Sites
2,268
within ~10 miles of Suffield Depot
Risk Level
Elevated
Highest-severity
17 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Suffield Depot
Severity Distribution
within ~10 miles of Suffield Depot
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Suffield Depot
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 Suffield Depot average
Your land is one point inside Suffield Depot
Everything above resolves to Suffield Depot as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Suffield Depot Average
Suffield Depot Average
- ●USDA Zones 6b, averaged across Suffield Depot
- ●One soil character for all of Suffield Depot
- ●Frost dates read at Suffield Depot's scale: Apr 4 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Suffield Depot's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Suffield Depot
Pull a site-specific report for your exact address in Suffield Depot, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Suffield Depot averages can't show:
We read public map data around Suffield Depot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Suffield Depot average
How we know this about Suffield Depot
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 Suffield Depot’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 Suffield Depot
When does frost risk typically end in Suffield Depot?
The last hard freeze (28°F) in Suffield Depot 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 Suffield Depot?
The first hard freeze (28°F) in Suffield Depot 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 Suffield Depot?
Measured between 28°F hard freezes, Suffield Depot 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 Suffield Depot?
The federal record around Suffield Depot is a meaningful one — 2,268 documented sites, mostly Brownfields entries (1,036), the nearest Underground Storage Tanks record about 0.7 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 Suffield Depot?
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 Suffield Depot's scale — its 6b band and its 211-day season. Your yard writes its own version of Suffield Depot'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 Suffield Depot’s own scale
7 of the readings below were taken at Suffield Depot's own scale — its own ~211-day season between 28°F freezes, the 1,371 acres it covers and 2,268 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Suffield Depot's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Suffield Depot's own 28°F hard-freeze dates, about Apr 4 and Nov 1 and the ~211-day span between themNOAA 1991–2020 Climate Normals
- 2,268 documented contamination sites on the federal record near Suffield Depot, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Suffield Depot's boundary and the 1,371 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 Suffield Depot's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Suffield Depotlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Suffield Depot's 1,371 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 Suffield Depot's 1,371 acreswhy one lot differs from the next →
- Which side of Suffield Depot you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,371 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 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 Suffield Depot-wide figureread your own land →