North Royalton, Ohio, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in North Royalton, 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 North Royalton 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 North Royalton — soil, climate, flood, and parcel records. How we handle your address.
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North Royalton — the short answer
North Royalton, Ohio: USDA zone 6b, about 215 days between hard freezes, across 14K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~215
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 14K 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 North Royalton's average, not your lot's — a low corner or a tree line moves it. Against North Royalton's 215-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in North Royalton
Each reading below is measured for North Royalton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorth Royalton runs about 215 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
MeasuredNorth Royalton 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 North Royalton is in
North Royalton sits in the Erie Drift Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at North Royalton's own centroid rather than borrowed from Cuyahoga County.
What Grows in North Royalton
Every plant below cleared North Royalton's own zone 6b and its 215-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in North Royalton?
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 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — 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 North Royalton
Spotted lanternfly documented 6 miles from North Royalton, first recorded 2023. What to watch for.
What's on the federal record near North Royalton
Closest first, within ~10 miles of North Royalton. Listing isn't leaking, and distance isn't exposure.
- H&D STEEL SERVICE INCUnderground Storage Tanks · 1400 ft
- HUNTER'S CREEK LIFT STATIONUnderground Storage Tanks · 1400 ft
- SPEEDWAY #3408Underground Storage Tanks · 1600 ft
- SPEEDWAY SUPERAMERICA LLC #3408Brownfields · 2000 ft
- AMERICA, METAL RECYCLINGToxics Release Inventory · 2300 ft
- ADVANCE AUTO PARTS #3996Brownfields · 2300 ft
- 7437 ASSOCIATESUnderground Storage Tanks · 2500 ft
- STEVENS ENGINEERS & CONSTRUCTORS INCBrownfields · 2600 ft
- STEVENS PAINTON CORPUnderground Storage Tanks · 2600 ft
- SPOSITS' CITGOUnderground Storage Tanks · 0.5 mi
- RECREATION CENTERUnderground Storage Tanks · 0.5 mi
- WILSON BENNETTUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from North Royalton'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 North Royalton.
Total Sites
1,882
within ~10 miles of North Royalton
Risk Level
Elevated
Highest-severity
11 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of North Royalton
Severity Distribution
within ~10 miles of North Royalton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around North Royalton, Toxics Release Inventory runs higher than the national average — 159 sites within ~10 miles of North Royalton. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 North Royalton
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 North Royalton average
Your land is one point inside North Royalton
Everything above resolves to North Royalton as a whole — one PHZM band and one 28°F frost record, read across 14K 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 North Royalton Average
North Royalton Average
- ●USDA Zones 6b, averaged across North Royalton
- ●One soil character for all of North Royalton
- ●Frost dates read at North Royalton's scale: Apr 9 to Nov 10
YOUR Parcel
- ✓Your exact zone, not North Royalton's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in North Royalton
Pull a site-specific report for your exact address in North Royalton, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that North Royalton averages can't show:
We read public map data around North Royalton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the North Royalton average
How we know this about North Royalton
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 North Royalton’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 North Royalton
When does frost risk typically end in North Royalton?
The last hard freeze (28°F) in North Royalton typically lands around Apr 9, 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 30.
When is the first frost in North Royalton?
The first hard freeze (28°F) in North Royalton typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 215 days after the spring freeze cleared.
How long is the growing season in North Royalton?
Measured between 28°F hard freezes, North Royalton sees about 215 frost-free days — roughly Apr 9 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 27, about 180 days.
Is the soil safe to grow vegetables in North Royalton?
The federal record around North Royalton is a meaningful one — 1,882 documented sites, mostly Underground Storage Tanks entries (986), the nearest Underground Storage Tanks 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.
How do I protect my plants from frost in North Royalton?
From about Oct 11 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at North Royalton's scale — its 6b band and its 215-day season. Your yard writes its own version of North Royalton'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 North Royalton’s own scale
7 of the readings below were taken at North Royalton's own scale — its own ~215-day season between 28°F freezes, the 13,694 acres it covers and 1,882 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- North Royalton's own USDA hardiness band, zones 6bUSDA PHZM 2023
- North Royalton's own 28°F hard-freeze dates, about Apr 9 and Nov 10 and the ~215-day span between themNOAA 1991–2020 Climate Normals
- 1,882 documented contamination sites on the federal record near North Royalton, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- North Royalton's boundary and the 13,694 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~215-day seasonGrowable Ground crop-matching engine
- The ecoregion at North Royalton's own centroid, the Erie Drift PlainUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of North Royaltonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so North Royalton's 13,694 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 North Royalton's 13,694 acreswhy one lot differs from the next →
- Which side of North Royalton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 13,694 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 North Royalton-wide figureread your own land →