Rock Ridge, Connecticut, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Reliable performers under these conditions include cabbage, hazelnut, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Rock Ridge, 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 Rock Ridge 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 Rock Ridge — soil, climate, flood, and parcel records. How we handle your address.
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Rock Ridge — the short answer
Rock Ridge, Connecticut: USDA zone 7a, about 240 days between hard freezes, across 582 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~240
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 582 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 7a is Rock Ridge's average, not your lot's — a low corner or a tree line moves it. Against Rock Ridge's 240-day season, see what your own ground reads.
Your town runs its own season
Rock Ridge's own 30-year record measures about 240 days between 28°F killing freezes — 33 days longer than Western Connecticut Planning Region's ~207. Both are measured records, not estimates.
That gap is the whole reason a county average can mislead here. Plant against Rock Ridge's ~240-day season rather than the county figure — and the sun, slope and cold-air drainage on your specific lot move it again.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record. Both figures are measured records — this town’s own and its county’s. A town with no record of its own is absent here rather than estimated.
Soil varies lot by lot — soil types explained.
What this means for growing in Rock Ridge
Each reading below is measured for Rock Ridge itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRock Ridge runs about 240 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
MeasuredRock Ridge sits in USDA hardiness zone 7a.
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 Rock Ridge is in
Rock Ridge sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rock Ridge's own centroid rather than borrowed from Western Connecticut Planning Region.
What Grows in Rock Ridge
Every plant below cleared Rock Ridge's own zone 7a and its 240-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Rock Ridge?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 23 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Rock Ridge
Spotted lanternfly documented 3 miles from Rock Ridge, first recorded 2021. What to watch for.
What's on the federal record near Rock Ridge
Closest first, within ~10 miles of Rock Ridge. Listing isn't leaking, and distance isn't exposure.
- GLENVILLE FIRE STATIONUnderground Storage Tanks · 0.8 mi
- POST ROAD IRON WORKSBrownfields · 0.9 mi
- MILLER MOTOR CARS, INC.Brownfields · 0.9 mi
- RCM 210, LLCBrownfields · 1.0 mi
- GREENWICH HOSPITALUnderground Storage Tanks · 1.0 mi
- GREENWICH HOSPITALBrownfields · 1.0 mi
- RCM 245Brownfields · 1.0 mi
- CECIO BROS., INC.Underground Storage Tanks · 1.0 mi
- A-1 LIMOUSINE SERVICE INC.Underground Storage Tanks · 1.0 mi
- GREENWICH METALS INC.Brownfields · 1.0 mi
- MIANUS FILTER PLANTUnderground Storage Tanks · 1.0 mi
- ACME 2494Brownfields · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rock Ridge'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 Rock Ridge.
Total Sites
1,347
within ~10 miles of Rock Ridge
Risk Level
Elevated
Highest-severity
7 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Rock Ridge
Severity Distribution
within ~10 miles of Rock Ridge
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rock Ridge, two things run higher than the national average within ~10 miles of Rock Ridge — PFAS (15 sites) and Brownfields (779 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Rock Ridge
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 Rock Ridge average
Your land is one point inside Rock Ridge
Everything above resolves to Rock Ridge as a whole — and this is a town whose own 30-year record already runs a season its county’s does not. Your parcel sits at one point inside even that. 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 Rock Ridge Average
Rock Ridge Average
- ●USDA Zones 7a, averaged across Rock Ridge
- ●One soil character for all of Rock Ridge
- ●Frost dates read at Rock Ridge's scale: Mar 28 to Nov 23
YOUR Parcel
- ✓Your exact zone, not Rock Ridge's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rock Ridge
Pull a site-specific report for your exact address in Rock Ridge, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rock Ridge averages can't show:
We read public map data around Rock Ridge — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rock Ridge average
How we know this about Rock Ridge
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 Rock Ridge’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 Rock Ridge
When does frost risk typically end in Rock Ridge?
The last hard freeze (28°F) in Rock Ridge typically lands around Mar 28, 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 18.
When is the first frost in Rock Ridge?
The first hard freeze (28°F) in Rock Ridge typically arrives around Nov 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 9, so the watching starts about Oct 24 — about 240 days after the spring freeze cleared.
How long is the growing season in Rock Ridge?
Measured between 28°F hard freezes, Rock Ridge sees about 240 frost-free days — roughly Mar 28 through Nov 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Nov 9, about 205 days.
Is the soil safe to grow vegetables in Rock Ridge?
The federal record around Rock Ridge is a meaningful one — 1,347 documented sites, mostly Brownfields entries (779), the nearest Underground Storage Tanks record about 0.8 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 Rock Ridge?
From about Oct 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 Nov 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rock Ridge's scale — its 7a band and its 240-day season. Your yard writes its own version of Rock Ridge'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 Rock Ridge’s own scale
7 of the readings below were taken at Rock Ridge's own scale — its own ~240-day season between 28°F freezes, the 582 acres it covers and 1,347 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rock Ridge's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Rock Ridge's own 28°F hard-freeze dates, about Mar 28 and Nov 23 and the ~240-day span between themNOAA 1991–2020 Climate Normals
- 1,347 documented contamination sites on the federal record near Rock Ridge, the closest Underground Storage Tanks record about 0.8 miles out from the town centreFederal environmental registers
- Rock Ridge's boundary and the 582 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~240-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rock Ridge's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Rock Ridgelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rock Ridge's 582 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 Rock Ridge's 582 acreswhy one lot differs from the next →
- Which side of Rock Ridge you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 582 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.8 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 Rock Ridge-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutRock Ridge sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides