Conrad, Iowa, sits in USDA hardiness zone 5a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Conrad, 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 Conrad 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 Conrad — soil, climate, flood, and parcel records. How we handle your address.
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Conrad — the short answer
Conrad, Iowa: USDA zone 5a, about 188 days between hard freezes, across 787 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
- 787 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 Conrad's average, not your lot's — a low corner or a tree line moves it. Against Conrad's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Conrad
Each reading below is measured for Conrad itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredConrad 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
MeasuredConrad 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 Conrad is in
Conrad sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Conrad's own centroid rather than borrowed from Grundy County.
What Grows in Conrad
Every plant below cleared Conrad'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 Conrad?
For most of the year, no — what changes is which crops still fit the days remaining. 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. 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 Conrad
Closest first, within ~10 miles of Conrad. Listing isn't leaking, and distance isn't exposure.
- CONRAD COOPERATIVEUnderground Storage Tanks · 100 ft
- RITCHIE INDUSTRIES INC.Toxics Release Inventory · 250 ft
- CONRAD MINI MARTUnderground Storage Tanks · 400 ft
- CONRAD TIRE & AUTO CENTERUnderground Storage Tanks · 950 ft
- 086N17W31ABDA 13238 1962Conrad 3Nitrate · 1100 ft
- 086N17W30CDDB 19097 1966Conrad 4Nitrate · 1300 ft
- 086N17W30DC 1958Conrad 1Nitrate · 1300 ft
- BCLUW HIGH SCHOOLBrownfields · 1300 ft
- BOBS FARM CENTER INCUnderground Storage Tanks · 1300 ft
- THAT PLACE STEAK HOUSEUnderground Storage Tanks · 1300 ft
- CARGILLUnderground Storage Tanks · 1300 ft
- CASEY''S GENERAL STORE 2802Underground Storage Tanks · 1400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Conrad'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 Conrad.
Total Sites
154
within ~10 miles of Conrad
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Conrad
Severity Distribution
within ~10 miles of Conrad
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Conrad, Nitrate runs higher than the national average — 78 sites within ~10 miles of Conrad. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Conrad
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 Conrad average
Your land is one point inside Conrad
Everything above resolves to Conrad as a whole — one PHZM band and one 28°F frost record, read across 787 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 Conrad Average
Conrad Average
- ●USDA Zones 5a, averaged across Conrad
- ●One soil character for all of Conrad
- ●Frost dates read at Conrad's scale: Apr 15 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Conrad's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Conrad
Pull a site-specific report for your exact address in Conrad, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Conrad averages can't show:
We read public map data around Conrad — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Conrad average
How we know this about Conrad
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 Conrad’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 Conrad
When does frost risk typically end in Conrad?
The last hard freeze (28°F) in Conrad 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 Conrad?
The first hard freeze (28°F) in Conrad 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 Conrad?
Measured between 28°F hard freezes, Conrad 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 Conrad?
The federal record around Conrad shows 154 documented sites, mostly Nitrate entries (78), the nearest Underground Storage Tanks record under a tenth of a mile 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 Conrad?
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 Conrad's scale — its 5a band and its 188-day season. Your yard writes its own version of Conrad'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 Conrad’s own scale
6 of the readings below were taken at Conrad's own scale — its own ~188-day season between 28°F freezes, the 787 acres it covers and 154 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Conrad's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Conrad's own 28°F hard-freeze dates, about Apr 15 and Oct 20 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 154 documented contamination sites on the federal record near Conrad, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Conrad's boundary and the 787 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 Conrad'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 Conrad's 787 acres read through its county's SSURGO summaryfrom Grundy County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Grundy 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 Grundy County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Conrad's 787 acreswhy one lot differs from the next →
- Which side of Conrad you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 787 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 Conrad-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaConrad sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides