Clarence, Missouri, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Clarence, 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 Clarence 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 Clarence — soil, climate, flood, and parcel records. How we handle your address.
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Clarence — the short answer
Clarence, Missouri: USDA zone 6a, about 213 days between hard freezes, across 740 acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 740 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 Clarence's average, not your lot's — a low corner or a tree line moves it. Against Clarence's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Clarence
Each reading below is measured for Clarence itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredClarence runs about 213 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
MeasuredClarence 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 Clarence is in
Clarence sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Clarence's own centroid rather than borrowed from Shelby County.
What Grows in Clarence
Every plant below cleared Clarence's own zone 6a and its 213-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Clarence?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Clarence
Closest first, within ~10 miles of Clarence. Listing isn't leaking, and distance isn't exposure.
- CHARLES WHITEUnderground Storage Tanks · 250 ft
- ADVANTAGE METALS RECYCLING LLC CLARENCEBrownfields · 1700 ft
- VAN HOUTEN SERVICEUnderground Storage Tanks · 2200 ft
- TOASTMASTER CLARENCESuperfund · 2200 ft
- CASEYS GENERAL STORES #1281Underground Storage Tanks · 2300 ft
- SMA MFG LLC DBA COCO LABSToxics Release Inventory · 0.6 mi
- SMA MFG LLC DBA COCO LABSBrownfields · 0.6 mi
- WINSTON SIMPSONCAFO · 2.5 mi
- RICHARD CHINNCAFO · 4.3 mi
- CHINN HOG FARM INC.CAFO · 4.6 mi
- JESSE GREENWOOD FARMCAFO · 6.2 mi
- JOHN GREENWOODCAFO · 6.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clarence'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 Clarence.
Total Sites
20
within ~10 miles of Clarence
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Clarence
Severity Distribution
within ~10 miles of Clarence
Highest-Severity Sites
Know Before You Grow
- •Large animal operations push nitrates and bacteria downstream. Below one, test your water.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Clarence
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 Clarence average
Your land is one point inside Clarence
Everything above resolves to Clarence as a whole — one PHZM band and one 28°F frost record, read across 740 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 Clarence Average
Clarence Average
- ●USDA Zones 6a, averaged across Clarence
- ●One soil character for all of Clarence
- ●Frost dates read at Clarence's scale: Apr 2 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Clarence's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Clarence
Pull a site-specific report for your exact address in Clarence, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clarence averages can't show:
We read public map data around Clarence — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clarence average
How we know this about Clarence
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 Clarence’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 Clarence
When does frost risk typically end in Clarence?
The last hard freeze (28°F) in Clarence typically lands around Apr 2, 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 23.
When is the first frost in Clarence?
The first hard freeze (28°F) in Clarence typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 213 days after the spring freeze cleared.
How long is the growing season in Clarence?
Measured between 28°F hard freezes, Clarence sees about 213 frost-free days — roughly Apr 2 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 23 to Oct 18, about 178 days.
Is the soil safe to grow vegetables in Clarence?
The federal record around Clarence is a meaningful one — 20 documented sites, mostly CAFO entries (7), 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 Clarence?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Clarence's scale — its 6a band and its 213-day season. Your yard writes its own version of Clarence'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 Clarence’s own scale
6 of the readings below were taken at Clarence's own scale — its own ~213-day season between 28°F freezes, the 740 acres it covers and 20 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Clarence's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Clarence's own 28°F hard-freeze dates, about Apr 2 and Nov 1 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 20 documented contamination sites on the federal record near Clarence, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Clarence's boundary and the 740 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Clarence's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Clarence's 740 acres read through its county's SSURGO summaryfrom Shelby County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Shelby County
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Shelby County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Clarence's 740 acreswhy one lot differs from the next →
- Which side of Clarence you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 740 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 Clarence-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriClarence sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides