Crystal City, 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 Crystal City, 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 Crystal City 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 Crystal City — soil, climate, flood, and parcel records. How we handle your address.
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Crystal City — the short answer
Crystal City, Texas: USDA zone 9a, about 307 days between hard freezes, across 2K acres of city.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 4
- Zavala County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 8
- Zavala County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~307
- Zavala County normal — NOAA 1991–2020, nearest to this town
- City area
- 2K 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 Zavala County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Crystal City's average, not your lot's — a low corner or a tree line moves it. Against Crystal City's 307-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Crystal City
Each reading below is measured for Crystal City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsCrystal City runs about 307 days between hard freezes (read from Zavala County, the closest normal to Crystal City) — 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
MeasuredCrystal City 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 Crystal City is in
Crystal City sits in the Southern Texas Plains — EPA Level III, inside the wider Great Plains. That is read at Crystal City's own centroid rather than borrowed from Zavala County.
What Grows in Crystal City
Every plant below cleared Crystal City's own zone 9a and its 307-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Crystal City?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Jan 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 8 — 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 Crystal City
Closest first, within ~10 miles of Crystal City. Listing isn't leaking, and distance isn't exposure.
- PIONEER OILCO 92Underground Storage Tanks · 1600 ft
- CRYSTAL CITY ISDUnderground Storage Tanks · 1700 ft
- KWIK CHEK 86Underground Storage Tanks · 1800 ft
- KWIK CHEK 85Underground Storage Tanks · 1800 ft
- J D CUEVASUnderground Storage Tanks · 1900 ft
- CITY MAINTENANCE YARDUnderground Storage Tanks · 1900 ft
- RICK AND JERRYSUnderground Storage Tanks · 1900 ft
- A & A TEXACOUnderground Storage Tanks · 2100 ft
- ROBERTO LOERAUnderground Storage Tanks · 2200 ft
- EL NINO FOODSUnderground Storage Tanks · 2300 ft
- OJS DRIVE INUnderground Storage Tanks · 2500 ft
- ESCAMILLAS DRIVE THRU BARN 2Underground Storage Tanks · 2500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Crystal City'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 Crystal City.
Sources Checked
within ~10 miles of Crystal City
Severity Distribution
within ~10 miles of Crystal City
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Crystal City
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 Crystal City average
Your land is one point inside Crystal City
Everything above resolves to Crystal City as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Zavala County’s record because no 30-year normal resolves at this city’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 city 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 Crystal City Average
Crystal City Average
- ●USDA Zones 9a, averaged across Crystal City
- ●One soil character for all of Crystal City
- ●Frost dates read at Crystal City's scale: Feb 4 to Dec 8
YOUR Parcel
- ✓Your exact zone, not Crystal City's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Crystal City
Pull a site-specific report for your exact address in Crystal City, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Crystal City averages can't show:
We read public map data around Crystal City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Crystal City average
How we know this about Crystal City
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Zavala 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 city grain anywhere on this page — there is no city-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 Crystal City
When does frost risk typically end in Crystal City?
The last hard freeze (28°F) in Crystal City typically lands around Feb 4, 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 25.
When is the first frost in Crystal City?
The first hard freeze (28°F) in Crystal City typically arrives around Dec 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 24, so the watching starts about Nov 8 — about 307 days after the spring freeze cleared.
How long is the growing season in Crystal City?
Measured between 28°F hard freezes, Crystal City sees about 307 frost-free days — roughly Feb 4 through Dec 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 25 to Nov 24, about 272 days.
Is the soil safe to grow vegetables in Crystal City?
The federal record around Crystal City is a meaningful one — 35 documented sites, mostly Underground Storage Tanks entries (20), the nearest Underground Storage Tanks record about 0.3 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 Crystal City?
From about Nov 8 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Crystal City's scale — its 9a band and its 307-day season. Your yard writes its own version of Crystal City'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 Crystal City’s own scale
5 of the readings below were taken at Crystal City's own scale — the 2,348 acres it covers and 35 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Crystal City's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 35 documented contamination sites on the federal record near Crystal City, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Crystal City's boundary and the 2,348 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~307-day seasonGrowable Ground crop-matching engine
- The ecoregion at Crystal City's own centroid, the Southern Texas PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Crystal City has no normal of its own, so its county's is the closest measured readfrom Zavala County
- Soil character — no town-scale survey exists, so Crystal City's 2,348 acres read through its county's SSURGO summaryfrom Zavala County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Zavala 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 Zavala County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Crystal City's 2,348 acreswhy one lot differs from the next →
- Which side of Crystal City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,348 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 Crystal City-wide figureread your own land →