Dulac, Louisiana, sits in USDA hardiness zone 9b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit okra, meyer lemon, california poppy, and artichoke — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Dulac, 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 Dulac 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 Dulac — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Dulac — the short answer
Dulac, Louisiana: USDA zone 9b, about 326 days between hard freezes, across 10K acres of town.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 24
- Terrebonne Parish normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 16
- Terrebonne Parish normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~326
- Terrebonne Parish normal — NOAA 1991–2020, nearest to this town
- Town area
- 10K 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 Terrebonne Parish’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Dulac's average, not your lot's — a low corner or a tree line moves it. Against Dulac's 326-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dulac
Each reading below is measured for Dulac itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsDulac runs about 326 days between hard freezes (read from Terrebonne Parish, the closest normal to Dulac) — 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
MeasuredDulac sits in USDA hardiness zone 9b.
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 Dulac is in
Dulac sits in the Mississippi Alluvial Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dulac's own centroid rather than borrowed from Terrebonne Parish.
What Grows in Dulac
Every plant below cleared Dulac's own zone 9b and its 326-day season. Each card opens that plant's Louisiana profile. How we score.
Is it too late to plant in Dulac?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 16 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Dulac
Closest first, within ~10 miles of Dulac. Listing isn't leaking, and distance isn't exposure.
- MOBILS DULAC SHOPBrownfields · 0.9 mi
- Chaissons GroceryUnderground Storage Tanks · 0.9 mi
- Naquins GroceryUnderground Storage Tanks · 1.0 mi
- ZAPATA PROTEIN (USA) INCToxics Release Inventory · 1.1 mi
- CURTS AUTO RPRBrownfields · 1.2 mi
- BJ SVCS CO USABrownfields · 1.6 mi
- DOLLAR GENERAL #24078Brownfields · 1.7 mi
- DUPRE BROS CONSTR CO INC DULAC YARDBrownfields · 1.7 mi
- F & J AUTO RPRBrownfields · 1.7 mi
- HOPE SVCS INCBrownfields · 1.7 mi
- USCG ANT DULACBrownfields · 2.1 mi
- UNOCAL SPIRIT ENER 76 DULAC SHOREBASEBrownfields · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dulac'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 Dulac.
Total Sites
103
within ~10 miles of Dulac
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Dulac
Severity Distribution
within ~10 miles of Dulac
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dulac, Brownfields runs higher than the national average — 59 sites within ~10 miles of Dulac. That's not a problem with your land — it's information about it.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Dulac
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 Dulac average
Your land is one point inside Dulac
Everything above resolves to Dulac as a whole — one PHZM band, read across 10K acres, with hard-freeze dates borrowed from Terrebonne 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 Dulac Average
Dulac Average
- ●USDA Zones 9b, averaged across Dulac
- ●One soil character for all of Dulac
- ●Frost dates read at Dulac's scale: Jan 24 to Dec 16
YOUR Parcel
- ✓Your exact zone, not Dulac's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dulac
Pull a site-specific report for your exact address in Dulac, Louisiana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dulac averages can't show:
We read public map data around Dulac — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dulac average
How we know this about Dulac
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 Terrebonne 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 Dulac
When does frost risk typically end in Dulac?
The last hard freeze (28°F) in Dulac typically lands around Jan 24, 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 Feb 14.
When is the first frost in Dulac?
The first hard freeze (28°F) in Dulac typically arrives around Dec 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 2, so the watching starts about Nov 16 — about 326 days after the spring freeze cleared.
How long is the growing season in Dulac?
Measured between 28°F hard freezes, Dulac sees about 326 frost-free days — roughly Jan 24 through Dec 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 14 to Dec 2, about 291 days.
Is the soil safe to grow vegetables in Dulac?
The federal record around Dulac shows 103 documented sites, mostly Brownfields entries (59), the nearest Brownfields record about 0.9 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 Dulac?
From about Nov 16 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dulac's scale — its 9b band and its 326-day season. Your yard writes its own version of Dulac'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 Dulac’s own scale
5 of the readings below were taken at Dulac's own scale — the 10,232 acres it covers and 103 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Dulac's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 103 documented contamination sites on the federal record near Dulac, the closest Brownfields record about 0.9 miles out from the town centreFederal environmental registers
- Dulac's boundary and the 10,232 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~326-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dulac's own centroid, the Mississippi Alluvial PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Dulac has no normal of its own, so its county's is the closest measured readfrom Terrebonne Parish
- Soil character — no town-scale survey exists, so Dulac's 10,232 acres read through its county's SSURGO summaryfrom Terrebonne County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Terrebonne 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 Terrebonne County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dulac's 10,232 acreswhy one lot differs from the next →
- Which side of Dulac you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,232 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.9 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 Dulac-wide figureread your own land →