Carmel, Indiana, sits in USDA hardiness zone 6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect cabbage, hazelnut, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Carmel, 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 Carmel 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 Carmel — soil, climate, flood, and parcel records. How we handle your address.
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Carmel — the short answer
Carmel, Indiana: USDA zone 6a, about 213 days between hard freezes, across 31K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 31K 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 Carmel's average, not your lot's — a low corner or a tree line moves it. Against Carmel's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Carmel
Each reading below is measured for Carmel itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCarmel runs about 213 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
MeasuredCarmel 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 Carmel is in
Carmel sits in the Eastern Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Carmel's own centroid rather than borrowed from Hamilton County.
What Grows in Carmel
Every plant below cleared Carmel's own zone 6a and its 213-day season. Each card opens that plant's Indiana profile. How we score.
Is it too late to plant in Carmel?
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 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (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. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Carmel
Survey cells within 31 miles of Carmel checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 53 miles off. What to watch for.
What's on the federal record near Carmel
Closest first, within ~10 miles of Carmel. Listing isn't leaking, and distance isn't exposure.
- CHEMSTATION OF INDIANAToxics Release Inventory · 150 ft
- MIDWEST ISOUnderground Storage Tanks · 1600 ft
- Meijer Store & Gas 130Underground Storage Tanks · 2600 ft
- LEIDOS QTC HEALTH SERVICES- CARMELBrownfields · 0.5 mi
- FRANCISCAN HEALTH CARMELBrownfields · 0.5 mi
- MERIDIAN MARK II CONFERENCE CENTERUnderground Storage Tanks · 0.5 mi
- JUST RITE CLEANERSBrownfields · 0.6 mi
- MEIJER STORE & GAS 130Brownfields · 0.6 mi
- MERIDIAN MARK IUnderground Storage Tanks · 0.7 mi
- Duke EnergyUnderground Storage Tanks · 0.7 mi
- CINERGY PSI CARMEL OFFICEBrownfields · 0.7 mi
- IU HEALTH NORTH HOSPITALBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Carmel'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 Carmel.
Sources Checked
within ~10 miles of Carmel
Severity Distribution
within ~10 miles of Carmel
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Carmel, Toxics Release Inventory runs higher than the national average — 97 sites within ~10 miles of Carmel. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Carmel
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 Carmel average
Your land is one point inside Carmel
Everything above resolves to Carmel as a whole — one PHZM band and one 28°F frost record, read across 31K 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 Carmel Average
Carmel Average
- ●USDA Zones 6a, averaged across Carmel
- ●One soil character for all of Carmel
- ●Frost dates read at Carmel's scale: Apr 4 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Carmel's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Carmel
Pull a site-specific report for your exact address in Carmel, Indiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Carmel averages can't show:
We read public map data around Carmel — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Carmel average
How we know this about Carmel
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 Carmel’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 Carmel
When does frost risk typically end in Carmel?
The last hard freeze (28°F) in Carmel typically lands around Apr 4, 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 Apr 25.
When is the first frost in Carmel?
The first hard freeze (28°F) in Carmel typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 213 days after the spring freeze cleared.
How long is the growing season in Carmel?
Measured between 28°F hard freezes, Carmel sees about 213 frost-free days — roughly Apr 4 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 20, about 178 days.
Is the soil safe to grow vegetables in Carmel?
The federal record around Carmel runs heavier than most — 1,372 documented sites, mostly Underground Storage Tanks entries (637), the nearest Toxics Release Inventory record under a tenth of a mile out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Carmel?
From about Oct 4 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 Nov 3 (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 Nov 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Carmel's scale — its 6a band and its 213-day season. Your yard writes its own version of Carmel'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 Carmel’s own scale
7 of the readings below were taken at Carmel's own scale — its own ~213-day season between 28°F freezes, the 31,418 acres it covers and 1,372 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Carmel's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Carmel's own 28°F hard-freeze dates, about Apr 4 and Nov 3 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 1,372 documented contamination sites on the federal record near Carmel, the closest Toxics Release Inventory record under a tenth of a mile out from the town centreFederal environmental registers
- Carmel's boundary and the 31,418 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Carmel's own centroid, the Eastern Corn Belt PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Carmel 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 Carmel's 31,418 acres read through its county's SSURGO summaryfrom Hamilton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hamilton County
- The growing challenges every Indiana grower plans around — written at state scale, so they stay on the state guidefrom Indiana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Hamilton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Carmel's 31,418 acreswhy one lot differs from the next →
- Which side of Carmel you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 31,418 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory 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 Carmel-wide figureread your own land →
More in Indiana
Wider growing context
What grows across IndianaCarmel sits outside our named growing regions, so Indiana as a whole is its closest context here.
Nearby growing guides