Mechanicsville, Iowa, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 Mechanicsville, 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 Mechanicsville 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 Mechanicsville — soil, climate, flood, and parcel records. How we handle your address.
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Mechanicsville — the short answer
Mechanicsville, Iowa: USDA zone 5a, about 189 days between hard freezes, across 527 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
- 527 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 Mechanicsville's average, not your lot's — a low corner or a tree line moves it. Against Mechanicsville's 189-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mechanicsville
Each reading below is measured for Mechanicsville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMechanicsville 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
MeasuredMechanicsville 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 Mechanicsville is in
Mechanicsville sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Mechanicsville's own centroid rather than borrowed from Cedar County.
What Grows in Mechanicsville
Every plant below cleared Mechanicsville'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 Mechanicsville?
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 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. 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 Mechanicsville
Closest first, within ~10 miles of Mechanicsville. Listing isn't leaking, and distance isn't exposure.
- BER MAR FARMSUnderground Storage Tanks · 450 ft
- 082N04W13DCB 13609 1962Mechanicsville 2Nitrate · 550 ft
- LINCOLN COMM SCHOOLUnderground Storage Tanks · 900 ft
- AGVANTAGEUnderground Storage Tanks · 1200 ft
- 082N04W13DC 1905Mechanicsville 1Nitrate · 1300 ft
- DEANS 76Underground Storage Tanks · 1300 ft
- RADIUM PETROLEUM COUnderground Storage Tanks · 1400 ft
- CASEYS GENERAL STORE 2989Underground Storage Tanks · 1500 ft
- CASEY''S GENERAL STORE #1445Underground Storage Tanks · 1500 ft
- CEDAR COUNTY MAINT SHED #5Underground Storage Tanks · 2100 ft
- 082N03W19BBAB 1967Mechanicsville 3Nitrate · 2300 ft
- 082N04W12AAD 03007 1947Nitrate · 1.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Mechanicsville'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 Mechanicsville.
Total Sites
126
within ~10 miles of Mechanicsville
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Mechanicsville
Severity Distribution
within ~10 miles of Mechanicsville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mechanicsville, Nitrate runs higher than the national average — 46 sites within ~10 miles of Mechanicsville. 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 Mechanicsville
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 Mechanicsville average
Your land is one point inside Mechanicsville
Everything above resolves to Mechanicsville as a whole — one PHZM band and one 28°F frost record, read across 527 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 Mechanicsville Average
Mechanicsville Average
- ●USDA Zones 5a, averaged across Mechanicsville
- ●One soil character for all of Mechanicsville
- ●Frost dates read at Mechanicsville's scale: Apr 14 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Mechanicsville's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mechanicsville
Pull a site-specific report for your exact address in Mechanicsville, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mechanicsville averages can't show:
We read public map data around Mechanicsville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mechanicsville average
How we know this about Mechanicsville
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 Mechanicsville’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 Mechanicsville
When does frost risk typically end in Mechanicsville?
The last hard freeze (28°F) in Mechanicsville 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 Mechanicsville?
The first hard freeze (28°F) in Mechanicsville 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 Mechanicsville?
Measured between 28°F hard freezes, Mechanicsville 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 Mechanicsville?
The federal record around Mechanicsville is a meaningful one — 126 documented sites, mostly Underground Storage Tanks entries (63), the nearest Underground Storage Tanks 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 Mechanicsville?
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 Mechanicsville's scale — its 5a band and its 189-day season. Your yard writes its own version of Mechanicsville'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 Mechanicsville’s own scale
6 of the readings below were taken at Mechanicsville's own scale — its own ~189-day season between 28°F freezes, the 527 acres it covers and 126 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mechanicsville's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Mechanicsville's own 28°F hard-freeze dates, about Apr 14 and Oct 20 and the ~189-day span between themNOAA 1991–2020 Climate Normals
- 126 documented contamination sites on the federal record near Mechanicsville, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Mechanicsville's boundary and the 527 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 Mechanicsville'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 Mechanicsville's 527 acres read through its county's SSURGO summaryfrom Cedar County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cedar 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 Cedar County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mechanicsville's 527 acreswhy one lot differs from the next →
- Which side of Mechanicsville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 527 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 Mechanicsville-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaMechanicsville sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides