Porter County, in Indiana, sits in USDA hardiness zone 6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Porter County lies within the Northwest Indiana / Lake Michigan Shoreline (Michiana Fruit Belt) — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Porter County holds more than one microclimate.
Soils and elevations shift across Porter County, so your frost dates and drainage aren't the county average. 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 Porter County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Porter County — the short answer
Porter County, Indiana: USDA zone 6a, about 206 days between hard freezes, across 268K acres.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 11
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~206
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 268K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 Porter County's average, not your lot's — a low corner or a tree line moves it. Against Porter County's 206-day season, see what your own ground reads.
Heat in Porter County
Across a year, Porter County accumulates about 2,776 growing degree days above 50°F, about 380 fewer than the middle Indiana county — ahead of 8 of Indiana’s 92 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Porter County
Across Porter County, the ground is predominantly Alfisols, where Ozaukee, Sebewa, and Riddles are the most extensive named soil series. The soil is generally somewhat poorly drained with a silt loam surface. Topsoil pH runs about 5.9–6.7, slightly acidic. Rainfall drains through hydrologic group A/D soils.
Soil order
Alfisols
Drainage
Somewhat poorly drained
Prime farmland
25%
Hydric soils
34%
Soil still varies lot by lot — soil types explained.
How the ground varies across Porter County
The USDA soil survey maps 25% of Porter County as somewhat poorly drained — but another 74% drains differently: 22% well drained, 18% very poorly drained.
Ozaukee is the most extensive named soil at 11% of mapped acres, then Sebewa (8%) and Riddles (7%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Porter County
Each reading below is measured for Porter County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Porter County are somewhat poorly drained, in hydrologic group A/D — ground that sheds water slowly.
Beds can stay saturated for days after heavy rain, and the roots of most vegetables, berries, and fruit trees suffocate or rot in soil that never drains.
Raised beds or mounded rows lift roots above the wet zone; choose water-tolerant crops for the lowest spots.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Porter County runs about pH 5.9–6.7, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredPorter County runs about 206 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredPorter County 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 Porter County is in
Porter County spans 2 EPA Level III ecoregions — Central Corn Belt Plains (63%) and Southern Michigan/Northern Indiana Drift Plains (37%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Porter County
We scored all 1,086 plants against Porter County's own USDA zone 6a and its own 206-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Indiana profile.
Is it too late to plant in Porter County?
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 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Porter County
Spotted lanternfly documented 8 miles from Porter County, first recorded 2023. What to watch for.
- Japanese beetle18 documented records
- monarch butterfly2 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Porter County
USGS estimates 113,305 lb of Glyphosate on Porter County farmland in 2019, its largest by weight, ahead of Atrazine (58,069 lb) and Acetochlor (40,550 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Porter County — and how to grow with it.
We checked the federal record across Porter County — 957 documented sites across 6 of the 9 source types we track.
The most significant on record: 10 Superfund sites (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Porter County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Porter County
Closest first, across Porter County. Listing isn't leaking, and distance isn't exposure.
- FESTIVAL HOMES OF INDIANAUnderground Storage Tanks · 1.0 mi
- CLIFFORD STONE & MATERIALUnderground Storage Tanks · 1.1 mi
- Valparaiso High SchoolUnderground Storage Tanks · 1.1 mi
- IVY TECHBrownfields · 1.6 mi
- COLLISION DAMAGE EXPERTSBrownfields · 1.7 mi
- Collision Damage ExpertsUnderground Storage Tanks · 1.7 mi
- COOLWOOD CLEANERSBrownfields · 1.7 mi
- NATIONWISE AUTO PARTS 274Underground Storage Tanks · 1.7 mi
- OIL N GOUnderground Storage Tanks · 1.7 mi
- Valpo Gas StationUnderground Storage Tanks · 1.7 mi
- KMART STORE 7042Underground Storage Tanks · 1.7 mi
- KMART STORE 7042Brownfields · 1.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Porter County'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 Porter County.
Total Sites
957
across Porter County
Risk Level
Elevated
Highest-severity
10 Superfund sites (none NPL-listed)
Sources Checked
across Porter County
Severity Distribution
across Porter County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Porter County, two things run higher than the national average across Porter County — Nitrate (254 sites) and Toxics Release Inventory (59 sites). 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.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Porter County
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 Porter County average
Your land is one point inside Porter County
Everything above resolves to Porter County as a whole — one PHZM band and one county frost record, read across 268K 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 county 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 county average.
Your Lot vs the Porter County Average
Porter County Average
- ●USDA Zones 6a, averaged across Porter County
- ●One soil character for all of Porter County
- ●Frost dates read at Porter County's scale: Apr 11 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Porter County's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Porter County
Pull a site-specific report for your exact address in Porter County, Indiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Porter County averages can't show:
We read public map data around Porter County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Porter County average
How we know this about Porter County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Porter County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Porter County
When does frost risk typically end in Porter County?
The last hard freeze (28°F) in Porter County typically lands around Apr 11, 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 2.
How long is the growing season in Porter County?
Measured between 28°F hard freezes, Porter County sees about 206 frost-free days — roughly Apr 11 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 2 to Oct 20, about 171 days.
Is the soil safe to grow vegetables in Porter County?
The federal record around Porter County is a meaningful one — 957 documented sites, mostly Underground Storage Tanks entries (415), the nearest Underground Storage Tanks record about 1.0 miles 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.
Everything above is measured at Porter County's scale — its 6a band and its 206-day season. Your yard writes its own version of Porter County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Indiana's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Porter County’s own scale
9 of the readings below were taken at Porter County's own scale — its own ~206-day span between 28°F freezes, the 3 most extensive soil series mapped here and 957 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Porter County's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Porter County's own 28°F hard-freeze dates and its ~206-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Porter CountyUSDA NRCS SSURGO
- 957 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record about 1.0 miles outFederal environmental registers
- Porter County's boundary and the 267,592 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~206-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Porter County spans, Central Corn Belt Plains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Porter County for 2 tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Porter County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Indiana grower plans around — written at state scale, so they stay on the state guidefrom Indiana
What this page can’t tell you
- How the season shifts across Porter County — the ~206 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Porter County's 267,592 acreswhy one lot differs from the next →
- Which of those 957 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Porter Countyread your own land →