Miller, Iowa, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 Miller, 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 Miller 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 Miller — soil, climate, flood, and parcel records. How we handle your address.
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Miller — the short answer
Miller, Iowa: USDA zone 5a, about 182 days between hard freezes, across 1K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~182
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Miller's average, not your lot's — a low corner or a tree line moves it. Against Miller's 182-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Miller
Each reading below is measured for Miller itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMiller runs about 182 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
MeasuredMiller 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 Miller is in
Miller sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Miller's own centroid rather than borrowed from Hancock County.
What Grows in Miller
Every plant below cleared Miller's own zone 5a and its 182-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Miller?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 17 — 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 Miller
Closest first, within ~10 miles of Miller. Listing isn't leaking, and distance isn't exposure.
- SOUTHTOWN BUILDING SUPPLY INCUnderground Storage Tanks · 3.2 mi
- FOREST CITY AVIATION INCBrownfields · 3.8 mi
- DALES BODY SHOPBrownfields · 3.9 mi
- 097N23W23ACC 1997NAWQANitrate · 4.3 mi
- HAYFIELD INDUSTRIESBrownfields · 4.4 mi
- CURTS GUN SHOPUnderground Storage Tanks · 4.5 mi
- FOREST CITY DISTRIBUTION CENTER-3M COMPANYBrownfields · 4.6 mi
- WINNEBAGO IND (SOUTH PLANT)Underground Storage Tanks · 4.6 mi
- HOLLAND CONTRACTING CORPUnderground Storage Tanks · 4.7 mi
- WINNEBAGO INDUSTRIES, INC - FOREST CITYToxics Release Inventory · 4.7 mi
- WINNEBAGO INDUSTRIES, INC - FOREST CITYBrownfields · 4.7 mi
- RANDALL READY MIX LLC - FOREST CITYBrownfields · 4.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Miller'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 Miller.
Total Sites
142
within ~10 miles of Miller
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Miller
Severity Distribution
within ~10 miles of Miller
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Miller
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 Miller average
Your land is one point inside Miller
Everything above resolves to Miller as a whole — one PHZM band and one 28°F frost record, read across 1K 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 town 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 Miller Average
Miller Average
- ●USDA Zones 5a, averaged across Miller
- ●One soil character for all of Miller
- ●Frost dates read at Miller's scale: Apr 18 to Oct 17
YOUR Parcel
- ✓Your exact zone, not Miller's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Miller
Pull a site-specific report for your exact address in Miller, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Miller averages can't show:
We read public map data around Miller — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Miller average
How we know this about Miller
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Miller’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 town grain anywhere on this page — there is no town-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 Miller
When does frost risk typically end in Miller?
The last hard freeze (28°F) in Miller typically lands around Apr 18, 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 9.
When is the first frost in Miller?
The first hard freeze (28°F) in Miller typically arrives around Oct 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 3, so the watching starts about Sep 17 — about 182 days after the spring freeze cleared.
How long is the growing season in Miller?
Measured between 28°F hard freezes, Miller sees about 182 frost-free days — roughly Apr 18 through Oct 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 9 to Oct 3, about 147 days.
Is the soil safe to grow vegetables in Miller?
The federal record around Miller shows 142 documented sites, mostly Underground Storage Tanks entries (71), the nearest Underground Storage Tanks record about 3.2 miles 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 Miller?
From about Sep 17 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 17 (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 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Miller's scale — its 5a band and its 182-day season. Your yard writes its own version of Miller'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 Miller’s own scale
6 of the readings below were taken at Miller's own scale — its own ~182-day season between 28°F freezes, the 1,322 acres it covers and 142 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Miller's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Miller's own 28°F hard-freeze dates, about Apr 18 and Oct 17 and the ~182-day span between themNOAA 1991–2020 Climate Normals
- 142 documented contamination sites on the federal record near Miller, the closest Underground Storage Tanks record about 3.2 miles out from the town centreFederal environmental registers
- Miller's boundary and the 1,322 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~182-day seasonGrowable Ground crop-matching engine
- The ecoregion at Miller'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 Miller's 1,322 acres read through its county's SSURGO summaryfrom Hancock County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hancock 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 Hancock County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Miller's 1,322 acreswhy one lot differs from the next →
- Which side of Miller you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,322 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 3.2 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 Miller-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaMiller sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides