Sheldon, Iowa, sits in USDA hardiness zone 4b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
The conditions favor cabbage, cranberry, turkish rocket, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Sheldon, 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 Sheldon 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 Sheldon — soil, climate, flood, and parcel records. How we handle your address.
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Sheldon — the short answer
Sheldon, Iowa: USDA zone 4b, about 175 days between hard freezes, across 3K acres of city.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~175
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 4b is Sheldon's average, not your lot's — a low corner or a tree line moves it. Against Sheldon's 175-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sheldon
Each reading below is measured for Sheldon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSheldon runs about 175 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
MeasuredSheldon sits in USDA hardiness zone 4b.
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 Sheldon is in
Sheldon sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Sheldon's own centroid rather than borrowed from O'Brien County.
What Grows in Sheldon
Every plant below cleared Sheldon's own zone 4b and its 175-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Sheldon?
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 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 13 — 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 Sheldon
Closest first, within ~10 miles of Sheldon. Listing isn't leaking, and distance isn't exposure.
- SHELDON CHRISTIAN SCHOOLUnderground Storage Tanks · 900 ft
- MOUWS MOBIL SERVICEUnderground Storage Tanks · 1300 ft
- CROP MATE COMPANYUnderground Storage Tanks · 1700 ft
- GEORGE PEKELDERUnderground Storage Tanks · 1700 ft
- SHELDON TRUCK PLAZAUnderground Storage Tanks · 1700 ft
- AG PROCESSING INCUnderground Storage Tanks · 1700 ft
- EAST LAWN CEMETERYUnderground Storage Tanks · 2000 ft
- CASEY''S GENERAL STORE #1557Underground Storage Tanks · 2400 ft
- TANKS LTDBrownfields · 2400 ft
- NORTHWEST IOWA HEALTH CENTERBrownfields · 2600 ft
- AIRLIN WAYNE DEVOSUnderground Storage Tanks · 2600 ft
- NORTHWEST IOWA HEALTH CENTERUnderground Storage Tanks · 2600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Sheldon'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 Sheldon.
Sources Checked
within ~10 miles of Sheldon
Severity Distribution
within ~10 miles of Sheldon
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sheldon, two things run higher than the national average within ~10 miles of Sheldon — CAFO (3 sites) and Nitrate (76 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Sheldon
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 Sheldon average
Your land is one point inside Sheldon
Everything above resolves to Sheldon as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Sheldon Average
Sheldon Average
- ●USDA Zones 4b, averaged across Sheldon
- ●One soil character for all of Sheldon
- ●Frost dates read at Sheldon's scale: Apr 21 to Oct 13
YOUR Parcel
- ✓Your exact zone, not Sheldon's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sheldon
Pull a site-specific report for your exact address in Sheldon, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sheldon averages can't show:
We read public map data around Sheldon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sheldon average
How we know this about Sheldon
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 Sheldon’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 Sheldon
When does frost risk typically end in Sheldon?
The last hard freeze (28°F) in Sheldon typically lands around Apr 21, 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 12.
When is the first frost in Sheldon?
The first hard freeze (28°F) in Sheldon typically arrives around Oct 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 29, so the watching starts about Sep 13 — about 175 days after the spring freeze cleared.
How long is the growing season in Sheldon?
Measured between 28°F hard freezes, Sheldon sees about 175 frost-free days — roughly Apr 21 through Oct 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 12 to Sep 29, about 140 days.
Is the soil safe to grow vegetables in Sheldon?
The federal record around Sheldon is a meaningful one — 188 documented sites, mostly Nitrate entries (76), the nearest Underground Storage Tanks record about 0.2 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 Sheldon?
From about Sep 13 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 13 (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 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sheldon's scale — its 4b band and its 175-day season. Your yard writes its own version of Sheldon'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 Sheldon’s own scale
6 of the readings below were taken at Sheldon's own scale — its own ~175-day season between 28°F freezes, the 3,074 acres it covers and 188 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sheldon's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Sheldon's own 28°F hard-freeze dates, about Apr 21 and Oct 13 and the ~175-day span between themNOAA 1991–2020 Climate Normals
- 188 documented contamination sites on the federal record near Sheldon, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Sheldon's boundary and the 3,074 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~175-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sheldon'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 Sheldon's 3,074 acres read through its county's SSURGO summaryfrom O'Brien County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom O'Brien 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 O'Brien County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sheldon's 3,074 acreswhy one lot differs from the next →
- Which side of Sheldon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,074 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Sheldon-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaSheldon sits outside our named growing regions, so Iowa as a whole is its closest context here.