Belle Plaine, Iowa, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The conditions favor cabbage, cranberry, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Belle Plaine, 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 Belle Plaine 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 Belle Plaine — soil, climate, flood, and parcel records. How we handle your address.
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Belle Plaine — the short answer
Belle Plaine, Iowa: USDA zone 5a, about 186 days between hard freezes, across 2K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~186
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 5a is Belle Plaine's average, not your lot's — a low corner or a tree line moves it. Against Belle Plaine's 186-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Belle Plaine
Each reading below is measured for Belle Plaine itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBelle Plaine runs about 186 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
MeasuredBelle Plaine sits in USDA hardiness zone 5a.
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 Belle Plaine is in
Belle Plaine sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Belle Plaine's own centroid rather than borrowed from Benton County.
What Grows in Belle Plaine
Every plant below cleared Belle Plaine's own zone 5a and its 186-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Belle Plaine?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 20 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Belle Plaine
Closest first, within ~10 miles of Belle Plaine. Listing isn't leaking, and distance isn't exposure.
- PEDERSON OIL & TIRE COUnderground Storage Tanks · 450 ft
- CARQUEST OF BELLE PLAINEBrownfields · 650 ft
- CASEY''S GENERAL STORE #1008Underground Storage Tanks · 700 ft
- B & B MOTORS INCUnderground Storage Tanks · 700 ft
- ZIP MARTUnderground Storage Tanks · 800 ft
- GRIEDER STANDARDUnderground Storage Tanks · 800 ft
- BELLE PLAINE OIL COMPANYUnderground Storage Tanks · 800 ft
- ROBERT SCHWABUnderground Storage Tanks · 850 ft
- CASEYS GENERAL STORE 3513Underground Storage Tanks · 1100 ft
- DUNNING TRUCKINGUnderground Storage Tanks · 1400 ft
- JOHNSON MOTORSBrownfields · 1800 ft
- GARLING CONST INCUnderground Storage Tanks · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Belle Plaine'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 Belle Plaine.
Total Sites
146
within ~10 miles of Belle Plaine
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Belle Plaine
Severity Distribution
within ~10 miles of Belle Plaine
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Belle Plaine, Nitrate runs higher than the national average — 86 sites within ~10 miles of Belle Plaine. 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 Belle Plaine
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 Belle Plaine average
Your land is one point inside Belle Plaine
Everything above resolves to Belle Plaine as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Belle Plaine Average
Belle Plaine Average
- ●USDA Zones 5a, averaged across Belle Plaine
- ●One soil character for all of Belle Plaine
- ●Frost dates read at Belle Plaine's scale: Apr 17 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Belle Plaine's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Belle Plaine
Pull a site-specific report for your exact address in Belle Plaine, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Belle Plaine averages can't show:
We read public map data around Belle Plaine — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Belle Plaine average
How we know this about Belle Plaine
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 Belle Plaine’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 Belle Plaine
When does frost risk typically end in Belle Plaine?
The last hard freeze (28°F) in Belle Plaine typically lands around Apr 17, 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 8.
When is the first frost in Belle Plaine?
The first hard freeze (28°F) in Belle Plaine typically arrives around Oct 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 6, so the watching starts about Sep 20 — about 186 days after the spring freeze cleared.
How long is the growing season in Belle Plaine?
Measured between 28°F hard freezes, Belle Plaine sees about 186 frost-free days — roughly Apr 17 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 6, about 151 days.
Is the soil safe to grow vegetables in Belle Plaine?
The federal record around Belle Plaine is a meaningful one — 146 documented sites, mostly Nitrate entries (86), 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 Belle Plaine?
From about Sep 20 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Belle Plaine's scale — its 5a band and its 186-day season. Your yard writes its own version of Belle Plaine'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 Belle Plaine’s own scale
6 of the readings below were taken at Belle Plaine's own scale — its own ~186-day season between 28°F freezes, the 2,035 acres it covers and 146 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Belle Plaine's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Belle Plaine's own 28°F hard-freeze dates, about Apr 17 and Oct 20 and the ~186-day span between themNOAA 1991–2020 Climate Normals
- 146 documented contamination sites on the federal record near Belle Plaine, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Belle Plaine's boundary and the 2,035 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~186-day seasonGrowable Ground crop-matching engine
- The ecoregion at Belle Plaine's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Belle Plaine's 2,035 acres read through its county's SSURGO summaryfrom Benton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Benton 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 Benton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Belle Plaine's 2,035 acreswhy one lot differs from the next →
- Which side of Belle Plaine you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,035 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 Belle Plaine-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaBelle Plaine sits outside our named growing regions, so Iowa as a whole is its closest context here.