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

Planting zone for 93543 — Littlerock, CA

ZIP code 93543 (Littlerock, 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 93543 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 Littlerock, 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 Littlerock, 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 — 4 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 93543

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 93543 came on Jan 29 — 11 days earlier than the 1991–2020 average (Feb 9).

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 Littlerock, CA

The soil mapped at the center of ZIP 93543 is Amargosa — coarse sandy loam, excessively drained.

TextureCoarse sandy loamdrains and warms fast; dries out and needs more feeding
pH6.3slightly acidic; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Amargosa rocky coarse sandy loam, 9 to 55 percent slopes, eroded.

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 93543; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Littlerock, 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 51 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 (4 mi away); precipitation: Pearblossom, CA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

935538b
Pearblossom, CA · 5 mi
935509a
Palmdale, CA · 7 mi
935528b
Palmdale, CA · 8 mi
935908b
Palmdale, CA · 11 mi
935998b
Palmdale, CA · 11 mi
935638a
Valyermo, CA · 11 mi
935448b
Llano, CA · 12 mi
935918b
Palmdale, CA · 12 mi

California planting zones →

Questions about 93543

What planting zone is ZIP code 93543?

ZIP code 93543 (Littlerock, 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 Littlerock, CA?

The median last spring frost (32 °F) near 93543 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 Littlerock, CA?

The median first fall frost near 93543 is December 1, giving a median frost-free growing season of 258 days.

When should I plant tomatoes in 93543?

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 93543 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 Littlerock, 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 93543 have?

The USDA soil survey maps Amargosa at the center of ZIP 93543: coarse sandy loam, excessively drained, pH about 6.3 (slightly acidic).

Did spring come early in Littlerock, CA in 2026?

Spring leaf-out near 93543 came on Jan 29 in 2026, 11 days earlier than the 1991–2020 average (Feb 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Littlerock, CA?

Intermediate onions: the longest day near 93543 is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.