Frohna, Missouri, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Well-matched crops include cabbage, hazelnut, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Frohna, 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 Frohna 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 Frohna — soil, climate, flood, and parcel records. How we handle your address.
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Frohna — the short answer
Frohna, Missouri: USDA zone 7a, about 230 days between hard freezes, across 578 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~230
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 578 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 Frohna's average, not your lot's — a low corner or a tree line moves it. Against Frohna's 230-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Frohna
Each reading below is measured for Frohna itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFrohna runs about 230 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
MeasuredFrohna 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 Frohna is in
Frohna sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Frohna's own centroid rather than borrowed from Perry County.
What Grows in Frohna
Every plant below cleared Frohna's own zone 7a and its 230-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Frohna?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 9 — 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.
What's on the federal record near Frohna
Closest first, within ~10 miles of Frohna. Listing isn't leaking, and distance isn't exposure.
- T34N R13E 20ACB1Nitrate · 700 ft
- T34N R13E 20ACA1Nitrate · 1200 ft
- WEST END GROCERYUnderground Storage Tanks · 1700 ft
- EAST PERRY LUMBER COBrownfields · 2400 ft
- RIVER HILLS TOOL & DIEBrownfields · 2500 ft
- T34N R13E 19CAA1Nitrate · 1.2 mi
- GAS A MATUnderground Storage Tanks · 1.4 mi
- ALTENBURG GARAGEUnderground Storage Tanks · 1.6 mi
- BELLMAN'S HARDWARE STOREUnderground Storage Tanks · 1.7 mi
- PETE'S PLACEUnderground Storage Tanks · 1.7 mi
- HEMMAN STOREUnderground Storage Tanks · 2.4 mi
- BRAZEAUUnderground Storage Tanks · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Frohna'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 Frohna.
Total Sites
61
within ~10 miles of Frohna
Risk Level
Elevated
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Frohna
Severity Distribution
within ~10 miles of Frohna
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Frohna, two things run higher than the national average within ~10 miles of Frohna — Mining (6 sites) and Nitrate (24 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Frohna
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 Frohna average
Your land is one point inside Frohna
Everything above resolves to Frohna as a whole — one PHZM band and one 28°F frost record, read across 578 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 Frohna Average
Frohna Average
- ●USDA Zones 7a, averaged across Frohna
- ●One soil character for all of Frohna
- ●Frost dates read at Frohna's scale: Mar 24 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Frohna's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Frohna
Pull a site-specific report for your exact address in Frohna, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Frohna averages can't show:
We read public map data around Frohna — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Frohna average
How we know this about Frohna
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 Frohna’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 Frohna
When does frost risk typically end in Frohna?
The last hard freeze (28°F) in Frohna typically lands around Mar 24, 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 14.
When is the first frost in Frohna?
The first hard freeze (28°F) in Frohna typically arrives around Nov 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 26, so the watching starts about Oct 10 — about 230 days after the spring freeze cleared.
How long is the growing season in Frohna?
Measured between 28°F hard freezes, Frohna sees about 230 frost-free days — roughly Mar 24 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 14 to Oct 26, about 195 days.
Is the soil safe to grow vegetables in Frohna?
The federal record around Frohna is a meaningful one — 61 documented sites, mostly Underground Storage Tanks entries (26), the nearest Nitrate record about 0.1 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 Frohna?
From about Oct 10 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Frohna's scale — its 7a band and its 230-day season. Your yard writes its own version of Frohna'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 Frohna’s own scale
6 of the readings below were taken at Frohna's own scale — its own ~230-day season between 28°F freezes, the 578 acres it covers and 61 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Frohna's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Frohna's own 28°F hard-freeze dates, about Mar 24 and Nov 9 and the ~230-day span between themNOAA 1991–2020 Climate Normals
- 61 documented contamination sites on the federal record near Frohna, the closest Nitrate record about 0.1 miles out from the town centreFederal environmental registers
- Frohna's boundary and the 578 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~230-day seasonGrowable Ground crop-matching engine
- The ecoregion at Frohna's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Frohna's 578 acres read through its county's SSURGO summaryfrom Perry County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Perry 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 Perry County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Frohna's 578 acreswhy one lot differs from the next →
- Which side of Frohna you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 578 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.1 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 Frohna-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriFrohna sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides