Boone, Iowa, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Boone, 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 Boone 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 Boone — soil, climate, flood, and parcel records. How we handle your address.
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Boone — the short answer
Boone, Iowa: USDA zone 5a, about 193 days between hard freezes, across 6K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~193
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 6K 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 Boone's average, not your lot's — a low corner or a tree line moves it. Against Boone's 193-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Boone
Each reading below is measured for Boone itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBoone runs about 193 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
MeasuredBoone 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 Boone is in
Boone sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Boone's own centroid rather than borrowed from Boone County.
What Grows in Boone
Every plant below cleared Boone's own zone 5a and its 193-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Boone?
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 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 23 — 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 Boone
Closest first, within ~10 miles of Boone. Listing isn't leaking, and distance isn't exposure.
- DES MOINES AREA COMMUNITY COLLEGE-BOONEBrownfields · 1800 ft
- BOONE GOLF & COUNTRY CLUBUnderground Storage Tanks · 2000 ft
- BOONE COUNTY HOSPITALBrownfields · 0.5 mi
- BOONE CITY PARKSUnderground Storage Tanks · 0.5 mi
- BOONE COUNTY HOSPITALUnderground Storage Tanks · 0.5 mi
- LINWOOD PARK CEMETERYUnderground Storage Tanks · 0.7 mi
- CULLIGAN WATER CONDITIONINGUnderground Storage Tanks · 0.7 mi
- KUM & GO #2217Underground Storage Tanks · 0.8 mi
- FORMER BRALAND''S STANDARDUnderground Storage Tanks · 0.8 mi
- CONDON SERVICE LTDBrownfields · 0.8 mi
- SINCLAIR STATION #14004Underground Storage Tanks · 0.8 mi
- BOONE WATER POLLUTION CONTROL PLANTUnderground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Boone'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 Boone.
Total Sites
164
within ~10 miles of Boone
Risk Level
Moderate
Highest-severity
8 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Boone
Severity Distribution
within ~10 miles of Boone
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 Boone
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 Boone average
Your land is one point inside Boone
Everything above resolves to Boone as a whole — one PHZM band and one 28°F frost record, read across 6K 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 Boone Average
Boone Average
- ●USDA Zones 5a, averaged across Boone
- ●One soil character for all of Boone
- ●Frost dates read at Boone's scale: Apr 13 to Oct 23
YOUR Parcel
- ✓Your exact zone, not Boone's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Boone
Pull a site-specific report for your exact address in Boone, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Boone averages can't show:
We read public map data around Boone — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Boone average
How we know this about Boone
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 Boone’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 Boone
When does frost risk typically end in Boone?
The last hard freeze (28°F) in Boone typically lands around Apr 13, 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 4.
When is the first frost in Boone?
The first hard freeze (28°F) in Boone typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 193 days after the spring freeze cleared.
How long is the growing season in Boone?
Measured between 28°F hard freezes, Boone sees about 193 frost-free days — roughly Apr 13 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 4 to Oct 9, about 158 days.
Is the soil safe to grow vegetables in Boone?
The federal record around Boone shows 164 documented sites, mostly Underground Storage Tanks entries (92), the nearest Brownfields record about 0.3 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 Boone?
From about Sep 23 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Boone's scale — its 5a band and its 193-day season. Your yard writes its own version of Boone'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 Boone’s own scale
6 of the readings below were taken at Boone's own scale — its own ~193-day season between 28°F freezes, the 5,850 acres it covers and 164 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Boone's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Boone's own 28°F hard-freeze dates, about Apr 13 and Oct 23 and the ~193-day span between themNOAA 1991–2020 Climate Normals
- 164 documented contamination sites on the federal record near Boone, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Boone's boundary and the 5,850 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~193-day seasonGrowable Ground crop-matching engine
- The ecoregion at Boone'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 Boone's 5,850 acres read through its county's SSURGO summaryfrom Boone County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Boone 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 Boone County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Boone's 5,850 acreswhy one lot differs from the next →
- Which side of Boone you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,850 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 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 Boone-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaBoone sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides