Carrizo Hill, Texas, sits in USDA hardiness zone 9a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit artichoke, fig, california poppy, and cabbage — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Carrizo Hill, 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 Carrizo Hill 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 Carrizo Hill — soil, climate, flood, and parcel records. How we handle your address.
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Carrizo Hill — the short answer
Carrizo Hill, Texas: USDA zone 9a, about 310 days between hard freezes, across 307 acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 2
- Dimmit County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 9
- Dimmit County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~310
- Dimmit County normal — NOAA 1991–2020, nearest to this town
- Town area
- 307 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 Dimmit County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Carrizo Hill's average, not your lot's — a low corner or a tree line moves it. Against Carrizo Hill's 310-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Carrizo Hill
Each reading below is measured for Carrizo Hill itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsCarrizo Hill runs about 310 days between hard freezes (read from Dimmit County, the closest normal to Carrizo Hill) — 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
MeasuredCarrizo Hill 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 Carrizo Hill is in
Carrizo Hill sits in the Southern Texas Plains — EPA Level III, inside the wider Great Plains. That is read at Carrizo Hill's own centroid rather than borrowed from Dimmit County.
What Grows in Carrizo Hill
Every plant below cleared Carrizo Hill's own zone 9a and its 310-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Carrizo Hill?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 9 — 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 Carrizo Hill
Closest first, within ~10 miles of Carrizo Hill. Listing isn't leaking, and distance isn't exposure.
- CARRIZO SPRINGS BULK PLANTUnderground Storage Tanks · 1400 ft
- HZ-77-34-2xxNitrate · 1.0 mi
- PILOT TRAVEL CENTER 1026Underground Storage Tanks · 1.1 mi
- BAKER PETROLITE LLC - CARRIZO SPRINGS, TXBrownfields · 1.2 mi
- HZ-77-26-816Nitrate · 1.4 mi
- HZ-77-34-104Nitrate · 1.6 mi
- CITY WAREHOUSEUnderground Storage Tanks · 1.7 mi
- 7-ELEVEN STORE 40532Underground Storage Tanks · 1.9 mi
- FIVE POINTS MARKET 15Underground Storage Tanks · 1.9 mi
- BIG THRIFTUnderground Storage Tanks · 1.9 mi
- BUCKS COUNTRY STOREUnderground Storage Tanks · 2.0 mi
- U.S. CUSTOMS SERVICE FIRING RANGEToxics Release Inventory · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Carrizo Hill'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 Carrizo Hill.
Total Sites
71
within ~10 miles of Carrizo Hill
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Carrizo Hill
Severity Distribution
within ~10 miles of Carrizo Hill
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Carrizo Hill, Underground Storage Tanks runs higher than the national average — 47 sites within ~10 miles of Carrizo Hill. 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.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Carrizo Hill
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 Carrizo Hill average
Your land is one point inside Carrizo Hill
Everything above resolves to Carrizo Hill as a whole — one PHZM band, read across 307 acres, with hard-freeze dates borrowed from Dimmit 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 Carrizo Hill Average
Carrizo Hill Average
- ●USDA Zones 9a, averaged across Carrizo Hill
- ●One soil character for all of Carrizo Hill
- ●Frost dates read at Carrizo Hill's scale: Feb 2 to Dec 9
YOUR Parcel
- ✓Your exact zone, not Carrizo Hill's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Carrizo Hill
Pull a site-specific report for your exact address in Carrizo Hill, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Carrizo Hill averages can't show:
We read public map data around Carrizo Hill — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Carrizo Hill average
How we know this about Carrizo Hill
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 Dimmit 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 Carrizo Hill
When does frost risk typically end in Carrizo Hill?
The last hard freeze (28°F) in Carrizo Hill typically lands around Feb 2, 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 23.
When is the first frost in Carrizo Hill?
The first hard freeze (28°F) in Carrizo Hill typically arrives around Dec 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 25, so the watching starts about Nov 9 — about 310 days after the spring freeze cleared.
How long is the growing season in Carrizo Hill?
Measured between 28°F hard freezes, Carrizo Hill sees about 310 frost-free days — roughly Feb 2 through Dec 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 23 to Nov 25, about 275 days.
Is the soil safe to grow vegetables in Carrizo Hill?
The federal record around Carrizo Hill shows 71 documented sites, mostly Underground Storage Tanks entries (47), the nearest Underground Storage Tanks record about 0.3 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 Carrizo Hill?
From about Nov 9 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Carrizo Hill's scale — its 9a band and its 310-day season. Your yard writes its own version of Carrizo Hill'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 Carrizo Hill’s own scale
5 of the readings below were taken at Carrizo Hill's own scale — the 307 acres it covers and 71 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Carrizo Hill's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 71 documented contamination sites on the federal record near Carrizo Hill, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Carrizo Hill's boundary and the 307 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~310-day seasonGrowable Ground crop-matching engine
- The ecoregion at Carrizo Hill's own centroid, the Southern Texas PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Carrizo Hill has no normal of its own, so its county's is the closest measured readfrom Dimmit County
- Soil character — no town-scale survey exists, so Carrizo Hill's 307 acres read through its county's SSURGO summaryfrom Dimmit County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Dimmit 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 Dimmit County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Carrizo Hill's 307 acreswhy one lot differs from the next →
- Which side of Carrizo Hill you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 307 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Carrizo Hill-wide figureread your own land →