London, Ohio, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 London, 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 London 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 London — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
London — the short answer
London, Ohio: USDA zone 6a, about 204 days between hard freezes, across 5K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~204
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 5K 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 6a is London's average, not your lot's — a low corner or a tree line moves it. Against London's 204-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in London
Each reading below is measured for London itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLondon runs about 204 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
MeasuredLondon sits in USDA hardiness zone 6a.
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 London is in
London sits in the Eastern Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at London's own centroid rather than borrowed from Madison County.
What Grows in London
Every plant below cleared London's own zone 6a and its 204-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in London?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 31 — 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 London
Spotted lanternfly documented 20 miles from London, first recorded 2022. What to watch for.
What's on the federal record near London
Closest first, within ~10 miles of London. Listing isn't leaking, and distance isn't exposure.
- ADS, INC.Underground Storage Tanks · 950 ft
- CVS PHARMACY #6191Brownfields · 1400 ft
- KROGER #388Underground Storage Tanks · 1700 ft
- DOLLAR GENERAL STORE #4261Brownfields · 1800 ft
- AUTOMOTIVE SPECIALIST OF LONDONBrownfields · 1900 ft
- KROGER #388Brownfields · 2000 ft
- ROYAL CABINETS INCBrownfields · 2100 ft
- BREWER PLUMBING & HEATINGUnderground Storage Tanks · 2200 ft
- CAPITOL WOOD PRESERVING COToxics Release Inventory · 2300 ft
- LONDON CITY SCHOOLSUnderground Storage Tanks · 0.5 mi
- AUTOMOTIVE SPECIALISTS OF LONDONBrownfields · 0.6 mi
- MURRY & EDWARDSUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from London'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 London.
Total Sites
136
within ~10 miles of London
Risk Level
Moderate
Highest-severity
10 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of London
Severity Distribution
within ~10 miles of London
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around London, two things run higher than the national average within ~10 miles of London — PFAS (3 sites) and Toxics Release Inventory (10 sites). That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in London
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 London average
Your land is one point inside London
Everything above resolves to London as a whole — one PHZM band and one 28°F frost record, read across 5K 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 London Average
London Average
- ●USDA Zones 6a, averaged across London
- ●One soil character for all of London
- ●Frost dates read at London's scale: Apr 10 to Oct 31
YOUR Parcel
- ✓Your exact zone, not London's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in London
Pull a site-specific report for your exact address in London, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that London averages can't show:
We read public map data around London — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the London average
How we know this about London
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 London’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 London
When does frost risk typically end in London?
The last hard freeze (28°F) in London typically lands around Apr 10, 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 May 1.
When is the first frost in London?
The first hard freeze (28°F) in London typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 204 days after the spring freeze cleared.
How long is the growing season in London?
Measured between 28°F hard freezes, London sees about 204 frost-free days — roughly Apr 10 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 17, about 169 days.
Is the soil safe to grow vegetables in London?
The federal record around London shows 136 documented sites, mostly Underground Storage Tanks entries (66), the nearest Underground Storage Tanks record about 0.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in London?
From about Oct 1 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 Oct 31 (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 Oct 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at London's scale — its 6a band and its 204-day season. Your yard writes its own version of London'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 London’s own scale
7 of the readings below were taken at London's own scale — its own ~204-day season between 28°F freezes, the 5,374 acres it covers and 136 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- London's own USDA hardiness band, zones 6aUSDA PHZM 2023
- London's own 28°F hard-freeze dates, about Apr 10 and Oct 31 and the ~204-day span between themNOAA 1991–2020 Climate Normals
- 136 documented contamination sites on the federal record near London, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- London's boundary and the 5,374 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~204-day seasonGrowable Ground crop-matching engine
- The ecoregion at London's own centroid, the Eastern Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Londonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so London's 5,374 acres read through its county's SSURGO summaryfrom Madison County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Madison 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 Madison County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among London's 5,374 acreswhy one lot differs from the next →
- Which side of London you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,374 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 London-wide figureread your own land →
More in Ohio
Wider growing context
What grows across OhioLondon sits outside our named growing regions, so Ohio as a whole is its closest context here.
Nearby growing guides