Mifflin, Ohio, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
The conditions favor cabbage, hazelnut, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Mifflin, 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 Mifflin 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 Mifflin — soil, climate, flood, and parcel records. How we handle your address.
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Mifflin — the short answer
Mifflin, Ohio: USDA zone 6a, about 192 days between hard freezes, across 117 acres of town.
- USDA zone
- 6a
- 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 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~192
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 117 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 6a is Mifflin's average, not your lot's — a low corner or a tree line moves it. Against Mifflin's 192-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mifflin
Each reading below is measured for Mifflin itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMifflin runs about 192 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
MeasuredMifflin sits in USDA hardiness zone 6a.
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 Mifflin is in
Mifflin sits in the Erie Drift Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Mifflin's own centroid rather than borrowed from Ashland County.
What Grows in Mifflin
Every plant below cleared Mifflin's own zone 6a and its 192-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in Mifflin?
For most of the year, no — what changes is which crops still fit the days remaining. 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 27 — 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.
Documented around Mifflin
Survey cells within 31 miles of Mifflin checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 42 miles off. What to watch for.
What's on the federal record near Mifflin
Closest first, within ~10 miles of Mifflin. Listing isn't leaking, and distance isn't exposure.
- SHAYONA 835 PROPERTY LLCUnderground Storage Tanks · 300 ft
- VESPER BODY AND REPAIRBrownfields · 350 ft
- LEM INVESTMENTS INC.Underground Storage Tanks · 2.0 mi
- MIFFLIN TWP FIRE DEPTUnderground Storage Tanks · 2.0 mi
- MARATHON #2993Underground Storage Tanks · 2.0 mi
- COUNTRYSIDE GROCERYUnderground Storage Tanks · 2.1 mi
- AUTO FITNESSBrownfields · 2.5 mi
- REED ROADUnderground Storage Tanks · 3.4 mi
- CHARLES MILL MARINAUnderground Storage Tanks · 3.4 mi
- FORMER BOOKMASTERSUnderground Storage Tanks · 3.7 mi
- GARNSEY AUTO REPAIRBrownfields · 4.1 mi
- COLUMBIA GAS TRANSMISSION CORP.Underground Storage Tanks · 4.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Mifflin'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 Mifflin.
Total Sites
554
within ~10 miles of Mifflin
Risk Level
Elevated
Highest-severity
8 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Mifflin
Severity Distribution
within ~10 miles of Mifflin
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mifflin, two things run higher than the national average within ~10 miles of Mifflin — Toxics Release Inventory (62 sites) and Superfund (8 sites). That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Mifflin
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 Mifflin average
Your land is one point inside Mifflin
Everything above resolves to Mifflin as a whole — one PHZM band and one 28°F frost record, read across 117 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 Mifflin Average
Mifflin Average
- ●USDA Zones 6a, averaged across Mifflin
- ●One soil character for all of Mifflin
- ●Frost dates read at Mifflin's scale: Apr 18 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Mifflin's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mifflin
Pull a site-specific report for your exact address in Mifflin, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mifflin averages can't show:
We read public map data around Mifflin — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mifflin average
How we know this about Mifflin
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 Mifflin’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 Mifflin
When does frost risk typically end in Mifflin?
The last hard freeze (28°F) in Mifflin 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 Mifflin?
The first hard freeze (28°F) in Mifflin typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 192 days after the spring freeze cleared.
How long is the growing season in Mifflin?
Measured between 28°F hard freezes, Mifflin sees about 192 frost-free days — roughly Apr 18 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 9 to Oct 13, about 157 days.
Is the soil safe to grow vegetables in Mifflin?
The federal record around Mifflin is a meaningful one — 554 documented sites, mostly Underground Storage Tanks entries (276), 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 Mifflin?
From about Sep 27 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mifflin's scale — its 6a band and its 192-day season. Your yard writes its own version of Mifflin'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 Mifflin’s own scale
7 of the readings below were taken at Mifflin's own scale — its own ~192-day season between 28°F freezes, the 117 acres it covers and 554 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mifflin's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Mifflin's own 28°F hard-freeze dates, about Apr 18 and Oct 27 and the ~192-day span between themNOAA 1991–2020 Climate Normals
- 554 documented contamination sites on the federal record near Mifflin, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Mifflin's boundary and the 117 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~192-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mifflin's own centroid, the Erie Drift PlainUS EPA Level III Ecoregions
- Lanternfly survey cells around Mifflin checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mifflin's 117 acres read through its county's SSURGO summaryfrom Ashland County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Ashland County
- The growing challenges every Ohio grower plans around — written at state scale, so they stay on the state guidefrom Ohio
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Ashland County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mifflin's 117 acreswhy one lot differs from the next →
- Which side of Mifflin you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 117 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 Mifflin-wide figureread your own land →
More in Ohio
Wider growing context
What grows across OhioMifflin sits outside our named growing regions, so Ohio as a whole is its closest context here.
Nearby growing guides