St. Joseph, Louisiana, sits in USDA hardiness zone 8b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in St. Joseph, 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 St. Joseph 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 St. Joseph — soil, climate, flood, and parcel records. How we handle your address.
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St. Joseph — the short answer
St. Joseph, Louisiana: USDA zone 8b, about 291 days between hard freezes, across 570 acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 13
- Tensas Parish normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 1
- Tensas Parish normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~291
- Tensas Parish normal — NOAA 1991–2020, nearest to this town
- Town area
- 570 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 Tensas Parish’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is St. Joseph's average, not your lot's — a low corner or a tree line moves it. Against St. Joseph's 291-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in St. Joseph
Each reading below is measured for St. Joseph itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSt. Joseph runs about 291 days between hard freezes (read from Tensas Parish, the closest normal to St. Joseph) — 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
MeasuredSt. Joseph sits in USDA hardiness zone 8b.
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 St. Joseph is in
St. Joseph sits in the Mississippi Alluvial Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at St. Joseph's own centroid rather than borrowed from Tensas Parish.
What Grows in St. Joseph
Every plant below cleared St. Joseph's own zone 8b and its 291-day season. Each card opens that plant's Louisiana profile. How we score.
Is it too late to plant in St. Joseph?
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 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 1 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near St. Joseph
Closest first, within ~10 miles of St. Joseph. Listing isn't leaking, and distance isn't exposure.
- Lake Bruin GroceryUnderground Storage Tanks · 800 ft
- Ts-3Nitrate · 1200 ft
- Key StopUnderground Storage Tanks · 1300 ft
- MCVAY AUTO RPRBrownfields · 1300 ft
- Trak Food Store - St JosephUnderground Storage Tanks · 1500 ft
- DOLLAR GENERAL 7948Brownfields · 1600 ft
- Ts-11Nitrate · 1900 ft
- Pearsons Full ServiceUnderground Storage Tanks · 2300 ft
- AARON AUTO RPRBrownfields · 2400 ft
- St Joe ExxonUnderground Storage Tanks · 2400 ft
- Ts-10Nitrate · 0.5 mi
- Ts-42Nitrate · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from St. Joseph'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 St. Joseph.
Sources Checked
within ~10 miles of St. Joseph
Severity Distribution
within ~10 miles of St. Joseph
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around St. Joseph, Nitrate runs higher than the national average — 30 sites within ~10 miles of St. Joseph. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in St. Joseph
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 St. Joseph average
Your land is one point inside St. Joseph
Everything above resolves to St. Joseph as a whole — one PHZM band, read across 570 acres, with hard-freeze dates borrowed from Tensas Parish’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 St. Joseph Average
St. Joseph Average
- ●USDA Zones 8b, averaged across St. Joseph
- ●One soil character for all of St. Joseph
- ●Frost dates read at St. Joseph's scale: Feb 13 to Dec 1
YOUR Parcel
- ✓Your exact zone, not St. Joseph's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in St. Joseph
Pull a site-specific report for your exact address in St. Joseph, Louisiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that St. Joseph averages can't show:
We read public map data around St. Joseph — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the St. Joseph average
How we know this about St. Joseph
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 Tensas Parish’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 St. Joseph
When does frost risk typically end in St. Joseph?
The last hard freeze (28°F) in St. Joseph typically lands around Feb 13, 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 6.
When is the first frost in St. Joseph?
The first hard freeze (28°F) in St. Joseph typically arrives around Dec 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 17, so the watching starts about Nov 1 — about 291 days after the spring freeze cleared.
How long is the growing season in St. Joseph?
Measured between 28°F hard freezes, St. Joseph sees about 291 frost-free days — roughly Feb 13 through Dec 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 6 to Nov 17, about 256 days.
Is the soil safe to grow vegetables in St. Joseph?
The federal record around St. Joseph shows 50 documented sites, mostly Nitrate entries (30), the nearest Underground Storage Tanks record about 0.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in St. Joseph?
From about Nov 1 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at St. Joseph's scale — its 8b band and its 291-day season. Your yard writes its own version of St. Joseph'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 St. Joseph’s own scale
5 of the readings below were taken at St. Joseph's own scale — the 570 acres it covers and 50 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- St. Joseph's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 50 documented contamination sites on the federal record near St. Joseph, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- St. Joseph's boundary and the 570 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~291-day seasonGrowable Ground crop-matching engine
- The ecoregion at St. Joseph's own centroid, the Mississippi Alluvial PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — St. Joseph has no normal of its own, so its county's is the closest measured readfrom Tensas Parish
- Soil character — no town-scale survey exists, so St. Joseph's 570 acres read through its county's SSURGO summaryfrom Tensas County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Tensas County
- The growing challenges every Louisiana grower plans around — written at state scale, so they stay on the state guidefrom Louisiana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Tensas County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among St. Joseph's 570 acreswhy one lot differs from the next →
- Which side of St. Joseph you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 570 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 St. Joseph-wide figureread your own land →
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