Toledo, 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.
These conditions suit cabbage, cranberry, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Toledo, 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 Toledo 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 Toledo — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Toledo — the short answer
Toledo, Iowa: USDA zone 5a, about 189 days between hard freezes, across 1K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- 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
- ~189
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City 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 Toledo's average, not your lot's — a low corner or a tree line moves it. Against Toledo's 189-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Toledo
Each reading below is measured for Toledo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredToledo runs about 189 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
MeasuredToledo 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 Toledo is in
Toledo sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Toledo's own centroid rather than borrowed from Tama County.
What Grows in Toledo
Every plant below cleared Toledo's own zone 5a and its 189-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Toledo?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (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 Toledo
Closest first, within ~10 miles of Toledo. Listing isn't leaking, and distance isn't exposure.
- PIONEER HI-BRED INTERNATIONAL, INC. - TOLEDOBrownfields · 800 ft
- IOWA JUVENILE HOMEUnderground Storage Tanks · 950 ft
- CASEY''S GENERAL STORE #1140Underground Storage Tanks · 1000 ft
- DICKS TIRE & CONOCOUnderground Storage Tanks · 1200 ft
- DICKS TIRE SERVICEBrownfields · 1200 ft
- KWIK STAR #710Underground Storage Tanks · 1200 ft
- PIONEER HI-BRED INTERNATIONAL INCUnderground Storage Tanks · 1200 ft
- CASEY''S GENERAL STORE 2653Underground Storage Tanks · 1400 ft
- JIFFY XPRESSUnderground Storage Tanks · 1400 ft
- AUSTIN MOTORSBrownfields · 1600 ft
- 083N15W15CDD 08494 1956Toledo 5Nitrate · 1600 ft
- 083N15W15CDAD 12687 1961Toledo 1Nitrate · 1700 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Toledo'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 Toledo.
Total Sites
120
within ~10 miles of Toledo
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Toledo
Severity Distribution
within ~10 miles of Toledo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Toledo, Nitrate runs higher than the national average — 40 sites within ~10 miles of Toledo. That's not a problem with your land — it's information about it.
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 Toledo
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 Toledo average
Your land is one point inside Toledo
Everything above resolves to Toledo 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 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 Toledo Average
Toledo Average
- ●USDA Zones 5a, averaged across Toledo
- ●One soil character for all of Toledo
- ●Frost dates read at Toledo's scale: Apr 14 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Toledo's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Toledo
Pull a site-specific report for your exact address in Toledo, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Toledo averages can't show:
We read public map data around Toledo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Toledo average
How we know this about Toledo
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 Toledo’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 Toledo
When does frost risk typically end in Toledo?
The last hard freeze (28°F) in Toledo typically lands around Apr 14, 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 5.
When is the first frost in Toledo?
The first hard freeze (28°F) in Toledo 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 189 days after the spring freeze cleared.
How long is the growing season in Toledo?
Measured between 28°F hard freezes, Toledo sees about 189 frost-free days — roughly Apr 14 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 6, about 154 days.
Is the soil safe to grow vegetables in Toledo?
The federal record around Toledo shows 120 documented sites, mostly Underground Storage Tanks entries (57), the nearest Brownfields record about 0.1 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 Toledo?
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 Toledo's scale — its 5a band and its 189-day season. Your yard writes its own version of Toledo'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 Toledo’s own scale
6 of the readings below were taken at Toledo's own scale — its own ~189-day season between 28°F freezes, the 1,469 acres it covers and 120 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Toledo's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Toledo's own 28°F hard-freeze dates, about Apr 14 and Oct 20 and the ~189-day span between themNOAA 1991–2020 Climate Normals
- 120 documented contamination sites on the federal record near Toledo, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Toledo's boundary and the 1,469 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~189-day seasonGrowable Ground crop-matching engine
- The ecoregion at Toledo'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 Toledo's 1,469 acres read through its county's SSURGO summaryfrom Tama County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Tama 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 Tama County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Toledo's 1,469 acreswhy one lot differs from the next →
- Which side of Toledo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,469 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Toledo-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaToledo sits outside our named growing regions, so Iowa as a whole is its closest context here.