Costilla, New Mexico, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Costilla, 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 Costilla 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 Costilla — soil, climate, flood, and parcel records. How we handle your address.
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Costilla — the short answer
Costilla, New Mexico: USDA zone 5a, about 141 days between hard freezes, across 2K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~141
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 5a is Costilla's average, not your lot's — a low corner or a tree line moves it. Against Costilla's 141-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Costilla
Each reading below is measured for Costilla itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCostilla runs about 141 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCostilla sits in USDA hardiness zone 5a.
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 Costilla is in
Costilla sits in the Arizona/New Mexico Plateau — EPA Level III, inside the wider North American Deserts. That is read at Costilla's own centroid rather than borrowed from Taos County.
What Grows in Costilla
Every plant below cleared Costilla's own zone 5a and its 141-day season. Each card opens that plant's New Mexico profile. How we score.
Is it too late to plant in Costilla?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Apr 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 1 — long-season crops need about 90 days of runway, quick greens only 30. When the window is tight, the fall moves are quick ones — baby greens, radishes, and garlic set for next season.
What's on the federal record near Costilla
Closest first, within ~10 miles of Costilla. Listing isn't leaking, and distance isn't exposure.
- COSTILLA GAS AND GROCERYUnderground Storage Tanks · 850 ft
- AMALIA LUMBER CO INCUnderground Storage Tanks · 950 ft
- 32N.13E.35.321Nitrate · 0.9 mi
- San Luis RclrUnderground Storage Tanks · 1.4 mi
- CB00107425AAA DUP2Nitrate · 5.4 mi
- 31N.13E.30.114 (Projected)Nitrate · 6.6 mi
- RUBYS RIVERSIDE STOREUnderground Storage Tanks · 7.8 mi
- ADOLPH GALLEGOS STOREUnderground Storage Tanks · 8.6 mi
- Mesita StoreUnderground Storage Tanks · 8.7 mi
- 30N.12E.01.1414 AR-1Nitrate · 8.8 mi
- AT&Tsan Luis RsUnderground Storage Tanks · 9.0 mi
- Costilla County ShopUnderground Storage Tanks · 9.0 mi
1 more site is on the record inside the same radius. See them on the map
Measured from Costilla'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 Costilla.
Severity Distribution
within ~10 miles of Costilla
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
Check your specific parcel in Costilla
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 Costilla average
Your land is one point inside Costilla
Everything above resolves to Costilla as a whole — one PHZM band and one 28°F frost record, read across 2K acres. 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 Costilla Average
Costilla Average
- ●USDA Zones 5a, averaged across Costilla
- ●One soil character for all of Costilla
- ●Frost dates read at Costilla's scale: May 13 to Oct 1
YOUR Parcel
- ✓Your exact zone, not Costilla's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Costilla
Pull a site-specific report for your exact address in Costilla, New Mexico — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Costilla averages can't show:
We read public map data around Costilla — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Costilla average
How we know this about Costilla
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 Costilla’s own record; 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 Costilla
When does frost risk typically end in Costilla?
The last hard freeze (28°F) in Costilla typically lands around May 13, 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 Jun 3.
When is the first frost in Costilla?
The first hard freeze (28°F) in Costilla typically arrives around Oct 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 17, so the watching starts about Sep 1 — about 141 days after the spring freeze cleared.
How long is the growing season in Costilla?
Measured between 28°F hard freezes, Costilla sees about 141 frost-free days — roughly May 13 through Oct 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 3 to Sep 17, about 106 days.
Is the soil safe to grow vegetables in Costilla?
The federal record around Costilla is light — 18 documented sites across the 9 federal source types we checked, mostly Nitrate entries (10), the nearest Underground Storage Tanks record about 0.2 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 gardeners stretch the season in Costilla?
With about 141 frost-free days between hard freezes, Costilla rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 169 to 197 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 13 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Costilla's scale — its 5a band and its 141-day season. Your yard writes its own version of Costilla'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 Costilla’s own scale
6 of the readings below were taken at Costilla's own scale — its own ~141-day season between 28°F freezes, the 1,937 acres it covers and 18 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Costilla's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Costilla's own 28°F hard-freeze dates, about May 13 and Oct 1 and the ~141-day span between themNOAA 1991–2020 Climate Normals
- 18 documented contamination sites on the federal record near Costilla, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Costilla's boundary and the 1,937 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~141-day seasonGrowable Ground crop-matching engine
- The ecoregion at Costilla's own centroid, the Arizona/New Mexico PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Costilla's 1,937 acres read through its county's SSURGO summaryfrom Taos County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Taos County
- The growing challenges every New Mexico grower plans around — written at state scale, so they stay on the state guidefrom New Mexico
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Taos County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Costilla's 1,937 acreswhy one lot differs from the next →
- Which side of Costilla you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,937 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Costilla-wide figureread your own land →