Rocky River, Ohio, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, hazelnut, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Rocky River, 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 Rocky River 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 Rocky River — soil, climate, flood, and parcel records. How we handle your address.
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Rocky River — the short answer
Rocky River, Ohio: USDA zone 7a, about 233 days between hard freezes, across 3K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~233
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 Rocky River's average, not your lot's — a low corner or a tree line moves it. Against Rocky River's 233-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rocky River
Each reading below is measured for Rocky River itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRocky River runs about 233 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
MeasuredRocky River 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 Rocky River is in
Rocky River sits in the Eastern Great Lakes Lowlands — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rocky River's own centroid, and it is not what its county reads: Cuyahoga County is mostly Erie Drift Plain. The wider page above you is answering a different question about different ground.
What Grows in Rocky River
Every plant below cleared Rocky River's own zone 7a and its 233-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in Rocky River?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — 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 Rocky River
Spotted lanternfly documented 3 miles from Rocky River, first recorded 2023. What to watch for.
What's on the federal record near Rocky River
Closest first, within ~10 miles of Rocky River. Listing isn't leaking, and distance isn't exposure.
- OHIO BELL TELEPHONE CO. L21122Underground Storage Tanks · 200 ft
- ROCKY RIVER BD OF EDBrownfields · 900 ft
- ROCKY RIVER SCHOOLSUnderground Storage Tanks · 1100 ft
- KERRINGTON OF ROCKY RIVERUnderground Storage Tanks · 1700 ft
- CITY OF ROCKY RIVERUnderground Storage Tanks · 1900 ft
- LAKEWOOD PARK CEMETERYUnderground Storage Tanks · 0.5 mi
- CUYAHOGA CO BD OF M/RUnderground Storage Tanks · 0.6 mi
- LUCKS AUTO REPAIRUnderground Storage Tanks · 0.7 mi
- CVS PHARMACY #3697Brownfields · 0.7 mi
- METROHEALTH ROCKY RIVER MEDICAL OFFICESBrownfields · 0.7 mi
- SHERWIN-WILLIAMSBrownfields · 0.7 mi
- LOWES #2450Brownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rocky River'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 Rocky River.
Sources Checked
within ~10 miles of Rocky River
Severity Distribution
within ~10 miles of Rocky River
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rocky River, Toxics Release Inventory runs higher than the national average — 197 sites within ~10 miles of Rocky River. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Rocky River
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 Rocky River average
Your land is one point inside Rocky River
Everything above resolves to Rocky River as a whole — one PHZM band and one 28°F frost record, read across 3K 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 city 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 Rocky River Average
Rocky River Average
- ●USDA Zones 7a, averaged across Rocky River
- ●One soil character for all of Rocky River
- ●Frost dates read at Rocky River's scale: Apr 1 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Rocky River's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rocky River
Pull a site-specific report for your exact address in Rocky River, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rocky River averages can't show:
We read public map data around Rocky River — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rocky River average
How we know this about Rocky River
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Rocky River’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 city grain anywhere on this page — there is no city-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 Rocky River
When does frost risk typically end in Rocky River?
The last hard freeze (28°F) in Rocky River typically lands around Apr 1, 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 22.
When is the first frost in Rocky River?
The first hard freeze (28°F) in Rocky River typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 233 days after the spring freeze cleared.
How long is the growing season in Rocky River?
Measured between 28°F hard freezes, Rocky River sees about 233 frost-free days — roughly Apr 1 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Nov 6, about 198 days.
Is the soil safe to grow vegetables in Rocky River?
The federal record around Rocky River is a meaningful one — 2,320 documented sites, mostly Underground Storage Tanks entries (1,248), the nearest Underground Storage Tanks record under a tenth of a mile 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 Rocky River?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rocky River's scale — its 7a band and its 233-day season. Your yard writes its own version of Rocky River'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 Rocky River’s own scale
7 of the readings below were taken at Rocky River's own scale — its own ~233-day season between 28°F freezes, the 3,027 acres it covers and 2,320 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rocky River's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Rocky River's own 28°F hard-freeze dates, about Apr 1 and Nov 20 and the ~233-day span between themNOAA 1991–2020 Climate Normals
- 2,320 documented contamination sites on the federal record near Rocky River, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Rocky River's boundary and the 3,027 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~233-day seasonGrowable Ground crop-matching engine
- Rocky River sits in the Eastern Great Lakes Lowlands — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Rocky Riverlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rocky River's 3,027 acres read through its county's SSURGO summaryfrom Cuyahoga County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cuyahoga County
- The growing challenges every Ohio grower plans around — written at state scale, so they stay on the state guidefrom Ohio
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Cuyahoga County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rocky River's 3,027 acreswhy one lot differs from the next →
- Which side of Rocky River you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,027 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Rocky River-wide figureread your own land →