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

Planting zone for 93591 — Palmdale, CA

ZIP code 93591 (Palmdale, Los Angeles County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 13 and the first fall frost December 1.

Where ZIP 93591 is

Outlined: the ZIP code area · 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostMar 13
First frostDec 1
2012 zone8b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Palmdale, CA…

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 Palmdale, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 13median — 50% chance of a later frost
Safe for tender plantsApril 17only 10% chance of frost after
First fall frostDecember 1median — 10% chance by Nov 12
Growing season258 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 9 and returns around December 12.

From the NOAA station Pearblossom, CA — 8 miles away, elevation 3,101 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 93591

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 30 – Feb 13
SpinachSow outdoors · Jan 30 – Feb 20
Broccoli, cabbageStart indoors · Jan 2 – Jan 16
Broccoli, cabbageTransplant · Feb 20 – Mar 6
Onion setsPlant outdoors · Feb 13 – Feb 27
PotatoesPlant outdoors · Feb 20 – Mar 6
LettuceSow outdoors · Feb 13 – Feb 27
Carrots, beetsSow outdoors · Feb 20 – Mar 6
TomatoesStart indoors · Jan 16 – Jan 30
TomatoesTransplant · Mar 20 – Apr 3
Peppers, eggplantStart indoors · Jan 2 – Jan 16
Peppers, eggplantTransplant · Mar 27 – Apr 10
BeansSow outdoors · Mar 20 – Apr 3
Sweet cornSow outdoors · Mar 20 – Apr 3
Cucumbers, squashSow outdoors · Mar 20 – Apr 3
Fall lettuce, spinachSow outdoors · Oct 6 – Oct 20
GarlicPlant cloves · Nov 17 – Dec 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 13) and first fall frost (Dec 1) 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 93591 came on Feb 1 — 3 days earlier than the 1991–2020 average (Feb 4).

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).

Soil in Palmdale, CA

The soil mapped at the center of ZIP 93591 is Hesperia — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH6.3slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.25%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Hesperia fine sandy loam, 0 to 2 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 93591; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Palmdale, CA

Summer high99 °Faverage high, July
Winter low36 °Faverage low, December
Hot days107days a year at 90 °F or more
Freezing nights26nights a year at 32 °F or less
Growing degree days5,595base 50 °F — the season’s usable heat
Longest day14 h 28 mindaylight on June 21
Shortest day9 h 50 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation6.8 inper year, rain and melted snow
Snowfall1 inper year

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 60 °F, low 38 °F 60°38° JanFebruary: average high 63 °F, low 39 °F 63°39° FebMarch: average high 69 °F, low 42 °F 69°42° MarApril: average high 75 °F, low 46 °F 75°46° AprMay: average high 84 °F, low 53 °F 84°53° MayJune: average high 93 °F, low 61 °F 93°61° JunJuly: average high 99 °F, low 68 °F 99°68° JulAugust: average high 98 °F, low 67 °F 98°67° AugSeptember: average high 91 °F, low 62 °F 91°62° SepOctober: average high 80 °F, low 53 °F 80°53° OctNovember: average high 67 °F, low 43 °F 67°43° NovDecember: average high 58 °F, low 36 °F 58°36° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 1.20 in precipitation, 0.2 in snowfall 1.2 JanFebruary: 1.61 in precipitation 1.6 FebMarch: 0.96 in precipitation 1.0 MarApril: 0.33 in precipitation 0.3 AprMay: 0.25 in precipitation 0.3 MayJune: 0.04 in precipitation 0.0 JunJuly: 0.15 in precipitation 0.1 JulAugust: 0.14 in precipitation 0.1 AugSeptember: 0.20 in precipitation 0.2 SepOctober: 0.27 in precipitation 0.3 OctNovember: 0.45 in precipitation, 0.2 in snowfall 0.5 NovDecember: 1.15 in precipitation, 0.6 in snowfall 1.1❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pearblossom, CA (8 mi away); precipitation: Pearblossom, CA (8 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.

935358b
Lancaster, CA · 8 mi
935448b
Llano, CA · 8 mi
935538b
Pearblossom, CA · 11 mi
935528b
Palmdale, CA · 12 mi
935438b
Littlerock, CA · 12 mi
923728b
Pinon Hills, CA · 15 mi
935638a
Valyermo, CA · 16 mi
923018b
Adelanto, CA · 17 mi

All 6 ZIP codes in Palmdale → · California planting zones →

Questions about 93591

What planting zone is ZIP code 93591?

ZIP code 93591 (Palmdale, CA) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Palmdale, CA?

The median last spring frost (32 °F) near 93591 is March 13; after April 17 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pearblossom station.

When is the first frost in Palmdale, CA?

The median first fall frost near 93591 is December 1, giving a median frost-free growing season of 258 days.

When should I plant tomatoes in 93591?

Start tomato seeds indoors around Jan 16 – Jan 30 and set transplants outside around Mar 20 – Apr 3, one to three weeks after the median last frost.

How much rain and snow does 93591 get?

About 6.8 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, Pearblossom station).

How hot do summers get in Palmdale, CA?

The average high peaks at 99 °F in July, with about 107 days a year at 90 °F or more.

What kind of soil does 93591 have?

The USDA soil survey maps Hesperia at the center of ZIP 93591: fine sandy loam, well drained, pH about 6.3 (slightly acidic).

Did spring come early in Palmdale, CA in 2026?

Spring leaf-out near 93591 came on Feb 1 in 2026, 3 days earlier than the 1991–2020 average (Feb 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Palmdale, CA?

Intermediate onions: the longest day near 93591 is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.