Allerton, Iowa, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Allerton, 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 Allerton 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 Allerton — soil, climate, flood, and parcel records. How we handle your address.
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Allerton — the short answer
Allerton, Iowa: USDA zone 5b, about 197 days between hard freezes, across 760 acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~197
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 760 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 5b is Allerton's average, not your lot's — a low corner or a tree line moves it. Against Allerton's 197-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Allerton
Each reading below is measured for Allerton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAllerton runs about 197 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredAllerton sits in USDA hardiness zone 5b.
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 Allerton is in
Allerton sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Allerton's own centroid rather than borrowed from Wayne County.
What Grows in Allerton
Every plant below cleared Allerton's own zone 5b and its 197-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Allerton?
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 Oct 23 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Allerton
Closest first, within ~10 miles of Allerton. Listing isn't leaking, and distance isn't exposure.
- BOB WHITE STATE PARKUnderground Storage Tanks · 750 ft
- RUARK GARAGE INCUnderground Storage Tanks · 750 ft
- DAIRICONCEPTSBrownfields · 1000 ft
- DAIRICONCEPTSToxics Release Inventory · 1000 ft
- ROD OWENS DX STATIONUnderground Storage Tanks · 1000 ft
- FIRST STOPUnderground Storage Tanks · 1200 ft
- GILLMAN BODY SHOPBrownfields · 1.6 mi
- 068N22W23CCNitrate · 2.8 mi
- 068N21W05CC 1957Nitrate · 3.3 mi
- ELDON & SHIRLEY SPIDLEUnderground Storage Tanks · 3.7 mi
- EAST PENN MANUFACTURING CO., INCToxics Release Inventory · 3.9 mi
- EAST PENN MANUFACTURING CO., INCBrownfields · 3.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Allerton'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 Allerton.
Total Sites
60
within ~10 miles of Allerton
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Allerton
Severity Distribution
within ~10 miles of Allerton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Allerton, Nitrate runs higher than the national average — 30 sites within ~10 miles of Allerton. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Allerton
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 Allerton average
Your land is one point inside Allerton
Everything above resolves to Allerton as a whole — one PHZM band and one 28°F frost record, read across 760 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 Allerton Average
Allerton Average
- ●USDA Zones 5b, averaged across Allerton
- ●One soil character for all of Allerton
- ●Frost dates read at Allerton's scale: Apr 9 to Oct 23
YOUR Parcel
- ✓Your exact zone, not Allerton's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Allerton
Pull a site-specific report for your exact address in Allerton, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Allerton averages can't show:
We read public map data around Allerton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Allerton average
How we know this about Allerton
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 Allerton’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 Allerton
When does frost risk typically end in Allerton?
The last hard freeze (28°F) in Allerton 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 Allerton?
The first hard freeze (28°F) in Allerton typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 197 days after the spring freeze cleared.
How long is the growing season in Allerton?
Measured between 28°F hard freezes, Allerton sees about 197 frost-free days — roughly Apr 9 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 9, about 162 days.
Is the soil safe to grow vegetables in Allerton?
The federal record around Allerton shows 60 documented sites, mostly Nitrate entries (30), the nearest Underground Storage Tanks record about 0.1 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 Allerton?
From about Sep 23 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Allerton's scale — its 5b band and its 197-day season. Your yard writes its own version of Allerton'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 Allerton’s own scale
6 of the readings below were taken at Allerton's own scale — its own ~197-day season between 28°F freezes, the 760 acres it covers and 60 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Allerton's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Allerton's own 28°F hard-freeze dates, about Apr 9 and Oct 23 and the ~197-day span between themNOAA 1991–2020 Climate Normals
- 60 documented contamination sites on the federal record near Allerton, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Allerton's boundary and the 760 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~197-day seasonGrowable Ground crop-matching engine
- The ecoregion at Allerton's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Allerton's 760 acres read through its county's SSURGO summaryfrom Wayne County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Wayne County
- The growing challenges every Iowa grower plans around — written at state scale, so they stay on the state guidefrom Iowa
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Wayne County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Allerton's 760 acreswhy one lot differs from the next →
- Which side of Allerton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 760 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Allerton-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaAllerton sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides