Helena, Mississippi, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: artichoke, fig, california poppy, and cabbage. The site-level story — soil, sun, drainage — decides the rest.
Even in Helena, 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 Helena 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 Helena — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Helena — the short answer
Helena, Mississippi: USDA zone 9a, about 298 days between hard freezes, across 3K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 11
- Jackson County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 6
- Jackson County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~298
- Jackson County normal — NOAA 1991–2020, nearest to this town
- Town area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Jackson County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Helena's average, not your lot's — a low corner or a tree line moves it. Against Helena's 298-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Helena
Each reading below is measured for Helena itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsHelena runs about 298 days between hard freezes (read from Jackson County, the closest normal to Helena) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHelena sits in USDA hardiness zone 9a.
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 Helena is in
Helena sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Helena's own centroid rather than borrowed from Jackson County.
What Grows in Helena
Every plant below cleared Helena's own zone 9a and its 298-day season. Each card opens that plant's Mississippi profile. How we score.
Is it too late to plant in Helena?
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 Jan 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 6 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Helena
Closest first, within ~10 miles of Helena. Listing isn't leaking, and distance isn't exposure.
- Steven Mabry GroceryUnderground Storage Tanks · 950 ft
- Helena HardwareUnderground Storage Tanks · 2000 ft
- District 1 Road HelenaUnderground Storage Tanks · 2500 ft
- HENIFF TRANSPORTATION SYSTEMS, LLCBrownfields · 1.5 mi
- AIRGAS SPECIALTY PRODUCTS - MOSS POINT FACILITYToxics Release Inventory · 1.5 mi
- NORTHROP GRUMMAN CORPORATIONBrownfields · 1.7 mi
- East Jackson County Road DepartmentUnderground Storage Tanks · 2.0 mi
- AVPRO AVIATIONBrownfields · 2.1 mi
- Jackson County AirportUnderground Storage Tanks · 2.1 mi
- Cochran's Quick StopUnderground Storage Tanks · 2.1 mi
- Escatawpa Regional Pump StationUnderground Storage Tanks · 2.1 mi
- 059L0028 JACKSONNitrate · 2.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Helena'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 Helena.
Sources Checked
within ~10 miles of Helena
Severity Distribution
within ~10 miles of Helena
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Helena, two things run higher than the national average within ~10 miles of Helena — PFAS (6 sites) and Nitrate (184 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Helena
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 Helena average
Your land is one point inside Helena
Everything above resolves to Helena as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Jackson County’s record because no 30-year normal resolves at this town’s own centroid. 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 Helena Average
Helena Average
- ●USDA Zones 9a, averaged across Helena
- ●One soil character for all of Helena
- ●Frost dates read at Helena's scale: Feb 11 to Dec 6
YOUR Parcel
- ✓Your exact zone, not Helena's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Helena
Pull a site-specific report for your exact address in Helena, Mississippi — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Helena averages can't show:
We read public map data around Helena — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Helena average
How we know this about Helena
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 Jackson County’s record, because none resolves here; 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 Helena
When does frost risk typically end in Helena?
The last hard freeze (28°F) in Helena typically lands around Feb 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 Mar 4.
When is the first frost in Helena?
The first hard freeze (28°F) in Helena typically arrives around Dec 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 22, so the watching starts about Nov 6 — about 298 days after the spring freeze cleared.
How long is the growing season in Helena?
Measured between 28°F hard freezes, Helena sees about 298 frost-free days — roughly Feb 11 through Dec 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 4 to Nov 22, about 263 days.
Is the soil safe to grow vegetables in Helena?
The federal record around Helena is a meaningful one — 578 documented sites, mostly Underground Storage Tanks entries (199), the nearest Underground Storage Tanks record about 0.2 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 Helena?
From about Nov 6 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 Dec 6 (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 Dec 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Helena's scale — its 9a band and its 298-day season. Your yard writes its own version of Helena'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 Helena’s own scale
5 of the readings below were taken at Helena's own scale — the 2,681 acres it covers and 578 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Helena's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 578 documented contamination sites on the federal record near Helena, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Helena's boundary and the 2,681 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~298-day seasonGrowable Ground crop-matching engine
- The ecoregion at Helena's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Helena has no normal of its own, so its county's is the closest measured readfrom Jackson County
- Soil character — no town-scale survey exists, so Helena's 2,681 acres read through its county's SSURGO summaryfrom Jackson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jackson County
- The growing challenges every Mississippi grower plans around — written at state scale, so they stay on the state guidefrom Mississippi
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Jackson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Helena's 2,681 acreswhy one lot differs from the next →
- Which side of Helena you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,681 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Helena-wide figureread your own land →
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