Gilbertville, Iowa, sits in USDA hardiness zone 5a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Among the crops suited to this profile: cabbage, cranberry, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Gilbertville, 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 Gilbertville 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 Gilbertville — soil, climate, flood, and parcel records. How we handle your address.
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Gilbertville — the short answer
Gilbertville, Iowa: USDA zone 5a, about 188 days between hard freezes, across 229 acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 15
- 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
- ~188
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 229 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 Gilbertville's average, not your lot's — a low corner or a tree line moves it. Against Gilbertville's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Gilbertville
Each reading below is measured for Gilbertville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGilbertville runs about 188 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
MeasuredGilbertville 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 Gilbertville is in
Gilbertville sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Gilbertville's own centroid rather than borrowed from Black Hawk County.
What Grows in Gilbertville
Every plant below cleared Gilbertville's own zone 5a and its 188-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Gilbertville?
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 Mar 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 15 (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. 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 Gilbertville
Closest first, within ~10 miles of Gilbertville. Listing isn't leaking, and distance isn't exposure.
- MEMBERS MUTUAL OIL COUnderground Storage Tanks · 200 ft
- 088N12W23CC 11169 1959Gilbertville 2Nitrate · 200 ft
- CITY OF GILBERTVILLE-FIRESTATIONUnderground Storage Tanks · 850 ft
- 088N12W23CDB 04778 1951Gilbertville 1Nitrate · 900 ft
- CASEY''S GENERAL STORE 2900Underground Storage Tanks · 2500 ft
- 088N12W15CACNitrate · 1.3 mi
- 088N12W21ACDC 1997NAWQA Black Hwk Co IADRN-3Nitrate · 1.7 mi
- SCHLEUSNER PROPERTYUnderground Storage Tanks · 2.0 mi
- AMOCO FOOD SHOPUnderground Storage Tanks · 2.7 mi
- YOUNGBLUT CONSTRUCTIONUnderground Storage Tanks · 2.7 mi
- PRONTO MARKETUnderground Storage Tanks · 2.7 mi
- Not KnownUnderground Storage Tanks · 2.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Gilbertville'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 Gilbertville.
Sources Checked
within ~10 miles of Gilbertville
Severity Distribution
within ~10 miles of Gilbertville
Highest-Severity Sites
Know Before You Grow
- •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.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Gilbertville
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 Gilbertville average
Your land is one point inside Gilbertville
Everything above resolves to Gilbertville as a whole — one PHZM band and one 28°F frost record, read across 229 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 Gilbertville Average
Gilbertville Average
- ●USDA Zones 5a, averaged across Gilbertville
- ●One soil character for all of Gilbertville
- ●Frost dates read at Gilbertville's scale: Apr 15 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Gilbertville's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Gilbertville
Pull a site-specific report for your exact address in Gilbertville, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Gilbertville averages can't show:
We read public map data around Gilbertville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Gilbertville average
How we know this about Gilbertville
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 Gilbertville’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 Gilbertville
When does frost risk typically end in Gilbertville?
The last hard freeze (28°F) in Gilbertville typically lands around Apr 15, 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 6.
When is the first frost in Gilbertville?
The first hard freeze (28°F) in Gilbertville 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 188 days after the spring freeze cleared.
How long is the growing season in Gilbertville?
Measured between 28°F hard freezes, Gilbertville sees about 188 frost-free days — roughly Apr 15 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 6 to Oct 6, about 153 days.
Is the soil safe to grow vegetables in Gilbertville?
The federal record around Gilbertville is a meaningful one — 471 documented sites, mostly Underground Storage Tanks entries (269), 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 Gilbertville?
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 Gilbertville's scale — its 5a band and its 188-day season. Your yard writes its own version of Gilbertville'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 Gilbertville’s own scale
6 of the readings below were taken at Gilbertville's own scale — its own ~188-day season between 28°F freezes, the 229 acres it covers and 471 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Gilbertville's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Gilbertville's own 28°F hard-freeze dates, about Apr 15 and Oct 20 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 471 documented contamination sites on the federal record near Gilbertville, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Gilbertville's boundary and the 229 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~188-day seasonGrowable Ground crop-matching engine
- The ecoregion at Gilbertville'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 Gilbertville's 229 acres read through its county's SSURGO summaryfrom Black Hawk County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Black Hawk 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 Black Hawk County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Gilbertville's 229 acreswhy one lot differs from the next →
- Which side of Gilbertville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 229 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 Gilbertville-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaGilbertville sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides