Storm Lake, Iowa, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Storm Lake, 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 Storm Lake 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 Storm Lake — soil, climate, flood, and parcel records. How we handle your address.
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Storm Lake — the short answer
Storm Lake, Iowa: USDA zone 5a, about 187 days between hard freezes, across 3K 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 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~187
- 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 5a is Storm Lake's average, not your lot's — a low corner or a tree line moves it. Against Storm Lake's 187-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Storm Lake
Each reading below is measured for Storm Lake itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredStorm Lake runs about 187 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
MeasuredStorm Lake 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 Storm Lake is in
Storm Lake sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Storm Lake's own centroid rather than borrowed from Buena Vista County.
What Grows in Storm Lake
Every plant below cleared Storm Lake's own zone 5a and its 187-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Storm Lake?
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 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 21 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Storm Lake
Closest first, within ~10 miles of Storm Lake. Listing isn't leaking, and distance isn't exposure.
- TYSON FOODS, INC. - SENECA ST - STORM LAKEToxics Release Inventory · 200 ft
- SARA LEE CORP FEED MILL-STORM LAKE IAToxics Release Inventory · 200 ft
- STORM LAKE COMMUNITY SCHOOLUnderground Storage Tanks · 250 ft
- THE PRICHARD COUnderground Storage Tanks · 500 ft
- RANDYS REPAIRUnderground Storage Tanks · 550 ft
- MIKES LAWN & GARDEN SERVICEUnderground Storage Tanks · 550 ft
- BUENA VISTA COUNTY SHEDUnderground Storage Tanks · 900 ft
- Not KnownUnderground Storage Tanks · 1000 ft
- SOUTH 66Underground Storage Tanks · 1200 ft
- FIRESTONE REAL ESTATE BK-62Underground Storage Tanks · 1200 ft
- GAES FREIGHTUnderground Storage Tanks · 1500 ft
- RONS FARM SERVICEUnderground Storage Tanks · 1600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Storm Lake'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 Storm Lake.
Total Sites
215
within ~10 miles of Storm Lake
Risk Level
Elevated
Highest-severity
15 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Storm Lake
Severity Distribution
within ~10 miles of Storm Lake
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Storm Lake, two things run higher than the national average within ~10 miles of Storm Lake — Toxics Release Inventory (15 sites) and Nitrate (58 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Storm Lake
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 Storm Lake average
Your land is one point inside Storm Lake
Everything above resolves to Storm Lake 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 Storm Lake Average
Storm Lake Average
- ●USDA Zones 5a, averaged across Storm Lake
- ●One soil character for all of Storm Lake
- ●Frost dates read at Storm Lake's scale: Apr 17 to Oct 21
YOUR Parcel
- ✓Your exact zone, not Storm Lake's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Storm Lake
Pull a site-specific report for your exact address in Storm Lake, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Storm Lake averages can't show:
We read public map data around Storm Lake — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Storm Lake average
How we know this about Storm Lake
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 Storm Lake’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 Storm Lake
When does frost risk typically end in Storm Lake?
The last hard freeze (28°F) in Storm Lake 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 Storm Lake?
The first hard freeze (28°F) in Storm Lake typically arrives around Oct 21, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 7, so the watching starts about Sep 21 — about 187 days after the spring freeze cleared.
How long is the growing season in Storm Lake?
Measured between 28°F hard freezes, Storm Lake sees about 187 frost-free days — roughly Apr 17 through Oct 21, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 7, about 152 days.
Is the soil safe to grow vegetables in Storm Lake?
The federal record around Storm Lake is a meaningful one — 215 documented sites, mostly Underground Storage Tanks entries (107), the nearest Toxics Release Inventory 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 Storm Lake?
From about Sep 21 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 21 (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 21. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Storm Lake's scale — its 5a band and its 187-day season. Your yard writes its own version of Storm Lake'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 Storm Lake’s own scale
6 of the readings below were taken at Storm Lake's own scale — its own ~187-day season between 28°F freezes, the 3,473 acres it covers and 215 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Storm Lake's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Storm Lake's own 28°F hard-freeze dates, about Apr 17 and Oct 21 and the ~187-day span between themNOAA 1991–2020 Climate Normals
- 215 documented contamination sites on the federal record near Storm Lake, the closest Toxics Release Inventory record under a tenth of a mile out from the town centreFederal environmental registers
- Storm Lake's boundary and the 3,473 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~187-day seasonGrowable Ground crop-matching engine
- The ecoregion at Storm Lake'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 Storm Lake's 3,473 acres read through its county's SSURGO summaryfrom Buena Vista County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Buena Vista 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 Buena Vista County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Storm Lake's 3,473 acreswhy one lot differs from the next →
- Which side of Storm Lake you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,473 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory 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 Storm Lake-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaStorm Lake sits outside our named growing regions, so Iowa as a whole is its closest context here.