Sebastian, Texas, sits in USDA hardiness zone 10a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Crops well matched to these conditions include okra, meyer lemon, california poppy, and artichoke — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Sebastian, 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 Sebastian 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 Sebastian — soil, climate, flood, and parcel records. How we handle your address.
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Sebastian — the short answer
Sebastian, Texas: USDA zone 10a, about 338 days between hard freezes, across 1K acres of town.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 19
- Willacy County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 23
- Willacy County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~338
- Willacy County normal — NOAA 1991–2020, nearest to this town
- Town area
- 1K 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 Willacy County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Sebastian's average, not your lot's — a low corner or a tree line moves it. Against Sebastian's 338-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sebastian
Each reading below is measured for Sebastian itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSebastian runs about 338 days between hard freezes (read from Willacy County, the closest normal to Sebastian) — 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
MeasuredSebastian sits in USDA hardiness zone 10a.
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 Sebastian is in
Sebastian sits in the Western Gulf Coastal Plain — EPA Level III, inside the wider Great Plains. That is read at Sebastian's own centroid rather than borrowed from Willacy County.
What Grows in Sebastian
Every plant below cleared Sebastian's own zone 10a and its 338-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Sebastian?
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 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 23 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Sebastian
Closest first, within ~10 miles of Sebastian. Listing isn't leaking, and distance isn't exposure.
- MY COUNTRY STOREUnderground Storage Tanks · 2100 ft
- SEBASTIAN MUDPFAS · 0.6 mi
- LYFORD GINUnderground Storage Tanks · 4.3 mi
- LYFORD CISDUnderground Storage Tanks · 4.6 mi
- TULIS QUIK MARTUnderground Storage Tanks · 4.8 mi
- BENNACK FLYING SERVICEUnderground Storage Tanks · 6.2 mi
- SANTA ROSA PLAZAUnderground Storage Tanks · 6.4 mi
- VALLEY SOLVENTS & CHEMICALSToxics Release Inventory · 6.7 mi
- VALLEY SOLVENTToxics Release Inventory · 6.7 mi
- VALLEY SOLVENTBrownfields · 6.7 mi
- TEX MEX FOOD MART 1Underground Storage Tanks · 6.9 mi
- RIO GRANDE VALLEY SUGARS GROWERSBrownfields · 6.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sebastian'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 Sebastian.
Total Sites
80
within ~10 miles of Sebastian
Risk Level
Moderate
Highest-severity
5 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Sebastian
Severity Distribution
within ~10 miles of Sebastian
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sebastian, two things run higher than the national average within ~10 miles of Sebastian — Underground Storage Tanks (62 sites) and Toxics Release Inventory (5 sites). That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Sebastian
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 Sebastian average
Your land is one point inside Sebastian
Everything above resolves to Sebastian as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from Willacy 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 Sebastian Average
Sebastian Average
- ●USDA Zones 10a, averaged across Sebastian
- ●One soil character for all of Sebastian
- ●Frost dates read at Sebastian's scale: Jan 19 to Dec 23
YOUR Parcel
- ✓Your exact zone, not Sebastian's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sebastian
Pull a site-specific report for your exact address in Sebastian, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sebastian averages can't show:
We read public map data around Sebastian — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sebastian average
How we know this about Sebastian
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 Willacy 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 Sebastian
When does frost risk typically end in Sebastian?
The last hard freeze (28°F) in Sebastian typically lands around Jan 19, 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 9.
When is the first frost in Sebastian?
The first hard freeze (28°F) in Sebastian typically arrives around Dec 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 9, so the watching starts about Nov 23 — about 338 days after the spring freeze cleared.
How long is the growing season in Sebastian?
Measured between 28°F hard freezes, Sebastian sees about 338 frost-free days — roughly Jan 19 through Dec 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 9 to Dec 9, about 303 days.
Is the soil safe to grow vegetables in Sebastian?
The federal record around Sebastian shows 80 documented sites, mostly Underground Storage Tanks entries (62), the nearest Underground Storage Tanks record about 0.4 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 Sebastian?
From about Nov 23 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sebastian's scale — its 10a band and its 338-day season. Your yard writes its own version of Sebastian'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 Sebastian’s own scale
5 of the readings below were taken at Sebastian's own scale — the 1,067 acres it covers and 80 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Sebastian's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 80 documented contamination sites on the federal record near Sebastian, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Sebastian's boundary and the 1,067 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~338-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sebastian's own centroid, the Western Gulf Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Sebastian has no normal of its own, so its county's is the closest measured readfrom Willacy County
- Soil character — no town-scale survey exists, so Sebastian's 1,067 acres read through its county's SSURGO summaryfrom Willacy County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Willacy County
- The growing challenges every Texas grower plans around — written at state scale, so they stay on the state guidefrom Texas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Willacy County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sebastian's 1,067 acreswhy one lot differs from the next →
- Which side of Sebastian you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,067 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Sebastian-wide figureread your own land →
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