Los Arcos, Texas, sits in USDA hardiness zone 9b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Reliable performers under these conditions include okra, meyer lemon, california poppy, and artichoke; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Los Arcos, 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 Los Arcos 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 Los Arcos — soil, climate, flood, and parcel records. How we handle your address.
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Los Arcos — the short answer
Los Arcos, Texas: USDA zone 9b, about 326 days between hard freezes, across 132 acres of town.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 25
- Webb County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 17
- Webb County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~326
- Webb County normal — NOAA 1991–2020, nearest to this town
- Town area
- 132 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 Webb County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Los Arcos's average, not your lot's — a low corner or a tree line moves it. Against Los Arcos's 326-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Los Arcos
Each reading below is measured for Los Arcos itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsLos Arcos runs about 326 days between hard freezes (read from Webb County, the closest normal to Los Arcos) — 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
MeasuredLos Arcos 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 Los Arcos is in
Los Arcos sits in the Southern Texas Plains — EPA Level III, inside the wider Great Plains. That is read at Los Arcos's own centroid rather than borrowed from Webb County.
What Grows in Los Arcos
Every plant below cleared Los Arcos's own zone 9b and its 326-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Los Arcos?
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 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 17 — 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 Los Arcos
Closest first, within ~10 miles of Los Arcos. Listing isn't leaking, and distance isn't exposure.
- YZ-85-30-501Nitrate · 5.9 mi
Measured from Los Arcos'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 Los Arcos.
Severity Distribution
within ~10 miles of Los Arcos
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Los Arcos
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 Los Arcos average
Your land is one point inside Los Arcos
Everything above resolves to Los Arcos as a whole — one PHZM band, read across 132 acres, with hard-freeze dates borrowed from Webb 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 Los Arcos Average
Los Arcos Average
- ●USDA Zones 9b, averaged across Los Arcos
- ●One soil character for all of Los Arcos
- ●Frost dates read at Los Arcos's scale: Jan 25 to Dec 17
YOUR Parcel
- ✓Your exact zone, not Los Arcos's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Los Arcos
Pull a site-specific report for your exact address in Los Arcos, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Los Arcos averages can't show:
We read public map data around Los Arcos — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Los Arcos average
How we know this about Los Arcos
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 Webb 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 Los Arcos
When does frost risk typically end in Los Arcos?
The last hard freeze (28°F) in Los Arcos typically lands around Jan 25, 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 15.
When is the first frost in Los Arcos?
The first hard freeze (28°F) in Los Arcos typically arrives around Dec 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 3, so the watching starts about Nov 17 — about 326 days after the spring freeze cleared.
How long is the growing season in Los Arcos?
Measured between 28°F hard freezes, Los Arcos sees about 326 frost-free days — roughly Jan 25 through Dec 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 15 to Dec 3, about 291 days.
Is the soil safe to grow vegetables in Los Arcos?
The federal record around Los Arcos is light — 2 documented sites across the 9 federal source types we checked, mostly Nitrate entries (2), the nearest Nitrate record about 5.9 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Los Arcos?
From about Nov 17 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 17 (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 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Los Arcos's scale — its 9b band and its 326-day season. Your yard writes its own version of Los Arcos'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 Los Arcos’s own scale
5 of the readings below were taken at Los Arcos's own scale — the 132 acres it covers and 2 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Los Arcos's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 2 documented contamination sites on the federal record near Los Arcos, the closest Nitrate record about 5.9 miles out from the town centreFederal environmental registers
- Los Arcos's boundary and the 132 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 Los Arcos's own centroid, the Southern Texas PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Los Arcos has no normal of its own, so its county's is the closest measured readfrom Webb County
- Soil character — no town-scale survey exists, so Los Arcos's 132 acres read through its county's SSURGO summaryfrom Webb County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Webb 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 Webb County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Los Arcos's 132 acreswhy one lot differs from the next →
- Which side of Los Arcos you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 132 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 5.9 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 Los Arcos-wide figureread your own land →