Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 88221 — Carlsbad, NM

ZIP code 88221 (Carlsbad, Eddy County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 27 and the first fall frost November 7.

Where ZIP 88221 is

tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 27
First frostNov 7
2012 zone7b

Was 7b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Carlsbad, NM…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Carlsbad, NM

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 27median — 50% chance of a later frost
Safe for tender plantsApril 13only 10% chance of frost after
First fall frostNovember 7median — 10% chance by Oct 26
Growing season223 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 9 and returns around November 16.

From the NOAA station Carlsbad Cavern City Airport, NM — 2 miles away, elevation 3,232 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 88221

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 13 – Feb 27
SpinachSow outdoors · Feb 13 – Mar 6
Broccoli, cabbageStart indoors · Jan 16 – Jan 30
Broccoli, cabbageTransplant · Mar 6 – Mar 20
Onion setsPlant outdoors · Feb 27 – Mar 13
PotatoesPlant outdoors · Mar 6 – Mar 20
LettuceSow outdoors · Feb 27 – Mar 13
Carrots, beetsSow outdoors · Mar 6 – Mar 20
TomatoesStart indoors · Jan 30 – Feb 13
TomatoesTransplant · Apr 3 – Apr 17
Peppers, eggplantStart indoors · Jan 16 – Jan 30
Peppers, eggplantTransplant · Apr 10 – Apr 24
BeansSow outdoors · Apr 3 – Apr 17
Sweet cornSow outdoors · Apr 3 – Apr 17
Cucumbers, squashSow outdoors · Apr 3 – Apr 17
Fall lettuce, spinachSow outdoors · Sep 12 – Sep 26
GarlicPlant cloves · Oct 24 – Nov 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 27) and first fall frost (Nov 7) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 88221 came on Feb 11 — 4 days later than the 1991–2020 average (Feb 7).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 8a in New Mexico

542 plants native to the lower 48 states, recorded in New Mexico, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. Each links to its USDA PLANTS profile.

Trees 29

Arizona cypress50 ft · blooms spring · low shade tolerance · to −23 °FArizona madrone30 ft · blooms late spring · high shade tolerance · to −4 °FArizona sycamore80 ft · blooms early spring · high shade tolerance · to −8 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack walnut100 ft · blooms late spring · high shade tolerance · to −28 °F

Shrubs 104

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican tarwort3 ft · blooms late spring · high shade tolerance · to −23 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °F

Wildflowers & perennials 232

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 167

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °Farctic bluegrass2 ft · high shade tolerance · to −62 °FArizona cottontop4 ft · blooms late summer · high shade tolerance · to −13 °F

Vines 1

western white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Carlsbad, NM.

Soil in Carlsbad, NM

The soil mapped at the center of ZIP 88221 is Upton — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables
pH7.6slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Upton gravelly loam, 0 to 9 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 88221; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Carlsbad, NM

Summer high96 °Faverage high, June
Winter low30 °Faverage low, January
Hot days121days a year at 90 °F or more
Freezing nights69nights a year at 32 °F or less
Growing degree days5,623base 50 °F — the season’s usable heat
Longest day14 h 16 mindaylight on June 21
Shortest day10 h 01 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation12.1 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 58 °F, low 30 °F 58°30° JanFebruary: average high 63 °F, low 34 °F 63°34° FebMarch: average high 71 °F, low 40 °F 71°40° MarApril: average high 80 °F, low 48 °F 80°48° AprMay: average high 88 °F, low 57 °F 88°57° MayJune: average high 96 °F, low 66 °F 96°66° JunJuly: average high 95 °F, low 69 °F 95°69° JulAugust: average high 94 °F, low 68 °F 94°68° AugSeptember: average high 87 °F, low 61 °F 87°61° SepOctober: average high 78 °F, low 49 °F 78°49° OctNovember: average high 66 °F, low 37 °F 66°37° NovDecember: average high 57 °F, low 30 °F 57°30° Dec

Precipitation by month inches

0″1″2″3″January: 0.37 in precipitation 0.4 JanFebruary: 0.42 in precipitation 0.4 FebMarch: 0.54 in precipitation 0.5 MarApril: 0.45 in precipitation 0.5 AprMay: 1.15 in precipitation 1.1 MayJune: 1.19 in precipitation 1.2 JunJuly: 1.76 in precipitation 1.8 JulAugust: 1.65 in precipitation 1.6 AugSeptember: 2.58 in precipitation 2.6 SepOctober: 0.89 in precipitation 0.9 OctNovember: 0.53 in precipitation 0.5 NovDecember: 0.52 in precipitation 0.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carlsbad Cavern City Airport, NM (2 mi away); precipitation: Carlsbad Cavern City Airport, NM (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

882208a
Carlsbad, NM · 8 mi
882688a
Whites City, NM · 12 mi
882638a
Malaga, NM · 20 mi
882548a
Lakewood, NM · 21 mi
882568a
Loving, NM · 26 mi
882117b
Artesia, NM · 29 mi
882108a
Artesia, NM · 30 mi
882558a
Loco Hills, NM · 37 mi

All 2 ZIP codes in Carlsbad → · New Mexico planting zones →

Questions about 88221

What planting zone is ZIP code 88221?

ZIP code 88221 (Carlsbad, NM) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Carlsbad, NM?

The median last spring frost (32 °F) near 88221 is March 27; after April 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Carlsbad Cavern City Airport station.

When is the first frost in Carlsbad, NM?

The median first fall frost near 88221 is November 7, giving a median frost-free growing season of 223 days.

When should I plant tomatoes in 88221?

Start tomato seeds indoors around Jan 30 – Feb 13 and set transplants outside around Apr 3 – Apr 17, one to three weeks after the median last frost.

How much rain and snow does 88221 get?

About 12.1 inches of precipitation a year (NOAA 1991–2020 normals, Carlsbad Cavern City Airport station).

How hot do summers get in Carlsbad, NM?

The average high peaks at 96 °F in June, with about 121 days a year at 90 °F or more.

What kind of soil does 88221 have?

The USDA soil survey maps Upton at the center of ZIP 88221: gravelly loam, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Carlsbad, NM in 2026?

Spring leaf-out near 88221 came on Feb 11 in 2026, 4 days later than the 1991–2020 average (Feb 7), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Carlsbad, NM?

Short-day onions: the longest day near 88221 is 14 h 16 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 88221 change?

Yes. The 2012 USDA map put 88221 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.