Sulphur Springs, Indiana, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Sulphur Springs, 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 Sulphur Springs 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 Sulphur Springs — soil, climate, flood, and parcel records. How we handle your address.
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Sulphur Springs — the short answer
Sulphur Springs, Indiana: USDA zone 6a, about 201 days between hard freezes, across 450 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~201
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 450 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 Sulphur Springs's average, not your lot's — a low corner or a tree line moves it. Against Sulphur Springs's 201-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sulphur Springs
Each reading below is measured for Sulphur Springs itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSulphur Springs runs about 201 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
MeasuredSulphur Springs 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 Sulphur Springs is in
Sulphur Springs sits in the Eastern Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Sulphur Springs's own centroid rather than borrowed from Henry County.
What Grows in Sulphur Springs
Every plant below cleared Sulphur Springs's own zone 6a and its 201-day season. Each card opens that plant's Indiana profile. How we score.
Is it too late to plant in Sulphur Springs?
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 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 28 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Sulphur Springs
Survey cells within 31 miles of Sulphur Springs checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 63 miles off. What to watch for.
What's on the federal record near Sulphur Springs
Closest first, within ~10 miles of Sulphur Springs. Listing isn't leaking, and distance isn't exposure.
- SULPHUR IMPLEMENTUnderground Storage Tanks · 0.6 mi
- HANCOCK TELECOMUnderground Storage Tanks · 0.6 mi
- SHENANDOAH HIGH SCHOOLPFAS · 0.6 mi
- NATIONAL GASUnderground Storage Tanks · 0.7 mi
- ANR PIPELINE SULPHUR SPRINGSBrownfields · 0.7 mi
- LELAND K ROBERTSUnderground Storage Tanks · 0.7 mi
- SCOTTYS AUTOBrownfields · 0.8 mi
- ROBERTS PIPELINE INCORPORATEDBrownfields · 1.0 mi
- ROBERTS PIPELINE CONSTRUCTION INCORPORATEDUnderground Storage Tanks · 1.0 mi
- JOES SALVAGEUnderground Storage Tanks · 1.4 mi
- Kairos Specialty Metals CorporationUnderground Storage Tanks · 2.7 mi
- SWITZER TANK LINES INCORPORATEDBrownfields · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sulphur Springs'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 Sulphur Springs.
Total Sites
200
within ~10 miles of Sulphur Springs
Risk Level
Elevated
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Sulphur Springs
Severity Distribution
within ~10 miles of Sulphur Springs
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sulphur Springs, two things run higher than the national average within ~10 miles of Sulphur Springs — Superfund (6 sites) and Underground Storage Tanks (133 sites). That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Sulphur Springs
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 Sulphur Springs average
Your land is one point inside Sulphur Springs
Everything above resolves to Sulphur Springs as a whole — one PHZM band and one 28°F frost record, read across 450 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 Sulphur Springs Average
Sulphur Springs Average
- ●USDA Zones 6a, averaged across Sulphur Springs
- ●One soil character for all of Sulphur Springs
- ●Frost dates read at Sulphur Springs's scale: Apr 10 to Oct 28
YOUR Parcel
- ✓Your exact zone, not Sulphur Springs's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sulphur Springs
Pull a site-specific report for your exact address in Sulphur Springs, Indiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sulphur Springs averages can't show:
We read public map data around Sulphur Springs — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sulphur Springs average
How we know this about Sulphur Springs
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 Sulphur Springs’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 Sulphur Springs
When does frost risk typically end in Sulphur Springs?
The last hard freeze (28°F) in Sulphur Springs typically lands around Apr 10, 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 1.
When is the first frost in Sulphur Springs?
The first hard freeze (28°F) in Sulphur Springs typically arrives around Oct 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 14, so the watching starts about Sep 28 — about 201 days after the spring freeze cleared.
How long is the growing season in Sulphur Springs?
Measured between 28°F hard freezes, Sulphur Springs sees about 201 frost-free days — roughly Apr 10 through Oct 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 14, about 166 days.
Is the soil safe to grow vegetables in Sulphur Springs?
The federal record around Sulphur Springs is a meaningful one — 200 documented sites, mostly Underground Storage Tanks entries (133), the nearest Underground Storage Tanks record about 0.6 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.
How do I protect my plants from frost in Sulphur Springs?
From about Sep 28 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sulphur Springs's scale — its 6a band and its 201-day season. Your yard writes its own version of Sulphur Springs'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 Sulphur Springs’s own scale
7 of the readings below were taken at Sulphur Springs's own scale — its own ~201-day season between 28°F freezes, the 450 acres it covers and 200 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sulphur Springs's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Sulphur Springs's own 28°F hard-freeze dates, about Apr 10 and Oct 28 and the ~201-day span between themNOAA 1991–2020 Climate Normals
- 200 documented contamination sites on the federal record near Sulphur Springs, the closest Underground Storage Tanks record about 0.6 miles out from the town centreFederal environmental registers
- Sulphur Springs's boundary and the 450 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~201-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sulphur Springs's own centroid, the Eastern Corn Belt PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Sulphur Springs 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 Sulphur Springs's 450 acres read through its county's SSURGO summaryfrom Henry County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Henry 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 Henry County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sulphur Springs's 450 acreswhy one lot differs from the next →
- Which side of Sulphur Springs you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 450 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.6 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 Sulphur Springs-wide figureread your own land →
More in Indiana
Wider growing context
What grows across IndianaSulphur Springs sits outside our named growing regions, so Indiana as a whole is its closest context here.
Nearby growing guides