Kent County, in Rhode Island, 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.
Well-matched crops include cabbage, hazelnut, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Kent County holds more than one microclimate.
Soils and elevations shift across Kent County, so your frost dates and drainage aren't the county average. 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 Kent County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Kent County — the short answer
Kent County, Rhode Island: USDA zone 6b, about 221 days between hard freezes, across 108K acres.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 31
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 7
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~221
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 108K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 Kent County's average, not your lot's — a low corner or a tree line moves it. Against Kent County's 221-day season, see what your own ground reads.
Heat in Kent County
Across a year, Kent County accumulates about 2,663 growing degree days above 50°F, about 28 more than the middle Rhode Island county — ahead of 3 of Rhode Island’s 5 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Kent County
Across Kent County, the ground is predominantly Inceptisols, where Canton, Charlton, and Hinckley are the most extensive named soil series. The soil is generally well drained with a fine sandy loam surface. Topsoil pH runs about 4.6–5.3, very strongly acidic. Rainfall drains through hydrologic group B soils.
Soil order
Inceptisols
Drainage
Well drained
Prime farmland
10%
Hydric soils
17%
Soil still varies lot by lot — soil types explained.
How the ground varies across Kent County
The USDA soil survey maps 40% of Kent County as well drained — but another 45% drains differently: 11% excessively drained, 10% somewhat excessively drained.
Canton is the most extensive named soil at 19% of mapped acres, then Charlton (13%) and Hinckley (10%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Kent County
Each reading below is measured for Kent County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Kent County are well drained, in hydrologic group B — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Kent County runs about pH 4.6–5.3, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Wet ground
MeasuredAbout 17% of Kent County is mapped as hydric — wetland — soil.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Season length
MeasuredKent County runs about 221 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
The kind of country Kent County is in
Kent County sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Kent County
We scored all 1,086 plants against Kent County's own USDA zone 6b and its own 221-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Rhode Island profile.
Is it too late to plant in Kent County?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 7 — 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 Kent County
Spotted lanternfly documented 4 miles from Kent County, first recorded 2023. What to watch for.
- Japanese beetle1 documented records
- monarch butterfly7 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Kent County
USGS estimates 53 lb of Glyphosate on Kent County farmland in 2019, its largest by weight, ahead of Atrazine (38 lb) and Metolachlor & Metolachlor-s (31 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Kent County — and how to grow with it.
We checked the federal record across Kent County — 1,046 documented sites across 6 of the 9 source types we track.
The most significant on record: 14 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Kent County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Kent County
Closest first, across Kent County. Listing isn't leaking, and distance isn't exposure.
- TRACTOR SUPPLY COMPANY #1219Brownfields · 1500 ft
- OCEAN STATE JOB LOT #104Brownfields · 2100 ft
- ATLANTIC PLUMBINGUnderground Storage Tanks · 2300 ft
- C P M AUTO CAREBrownfields · 2300 ft
- COLONIAL PLUMBING/HEATING SUPPLY CO.Underground Storage Tanks · 2500 ft
- MAPLE ROOT CORPORATIONUnderground Storage Tanks · 2500 ft
- RUSTYS MARINEBrownfields · 0.5 mi
- MATTESON'S OIL COMPANYUnderground Storage Tanks · 0.5 mi
- TWO GUYS AUTO REPAIR INCBrownfields · 0.5 mi
- COVENTRY TIRE & SUPPLYUnderground Storage Tanks · 0.5 mi
- N E MOBILE X-RAY HAVEN HEALTH COVENTRYBrownfields · 0.6 mi
- WALGREENS #11128Brownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Kent County'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 Kent County.
Sources Checked
across Kent County
Severity Distribution
across Kent County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kent County, Superfund runs higher than the national average — 14 sites across Kent County. 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 Kent County
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 Kent County average
Your land is one point inside Kent County
Everything above resolves to Kent County as a whole — one PHZM band and one county frost record, read across 108K 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 county 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 county average.
Your Lot vs the Kent County Average
Kent County Average
- ●USDA Zones 6b, averaged across Kent County
- ●One soil character for all of Kent County
- ●Frost dates read at Kent County's scale: Mar 31 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Kent County's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Kent County
Pull a site-specific report for your exact address in Kent County, Rhode Island — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kent County averages can't show:
We read public map data around Kent County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kent County average
How we know this about Kent County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Kent County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Kent County
When does frost risk typically end in Kent County?
The last hard freeze (28°F) in Kent County typically lands around Mar 31, 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 21.
How long is the growing season in Kent County?
Measured between 28°F hard freezes, Kent County sees about 221 frost-free days — roughly Mar 31 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 24, about 186 days.
Is the soil safe to grow vegetables in Kent County?
The federal record around Kent County is a meaningful one — 1,046 documented sites, mostly Underground Storage Tanks entries (489), the nearest Brownfields record about 0.3 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.
Everything above is measured at Kent County's scale — its 6b band and its 221-day season. Your yard writes its own version of Kent County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Rhode Island's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Kent County’s own scale
9 of the readings below were taken at Kent County's own scale — its own ~221-day span between 28°F freezes, the 3 most extensive soil series mapped here and 1,046 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Kent County's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Kent County's own 28°F hard-freeze dates and its ~221-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Kent CountyUSDA NRCS SSURGO
- 1,046 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 0.3 miles outFederal environmental registers
- Kent County's boundary and the 107,883 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~221-day seasonGrowable Ground crop-matching engine
- Kent County sitting wholly inside the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- Open occurrence records documented in Kent County for 2 tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Kent County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Rhode Island grower plans around — written at state scale, so they stay on the state guidefrom Rhode Island
What this page can’t tell you
- How the season shifts across Kent County — the ~221 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kent County's 107,883 acreswhy one lot differs from the next →
- Which of those 1,046 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Kent Countyread your own land →