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

Planting zone for 92301 — Adelanto, CA

ZIP code 92301 (Adelanto, San Bernardino County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 21 and the first fall frost November 12.

Where ZIP 92301 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 21
First frostNov 12
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 Adelanto, 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 Adelanto, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 21median — 50% chance of a later frost
Safe for tender plantsApril 22only 10% chance of frost after
First fall frostNovember 12median — 10% chance by Oct 28
Growing season235 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 21 and returns around November 27.

From the NOAA station El Mirage, CA — 7 miles away, elevation 2,950 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 92301

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 7 – Feb 21
SpinachSow outdoors · Feb 7 – Feb 28
Broccoli, cabbageStart indoors · Jan 10 – Jan 24
Broccoli, cabbageTransplant · Feb 28 – Mar 14
Onion setsPlant outdoors · Feb 21 – Mar 7
PotatoesPlant outdoors · Feb 28 – Mar 14
LettuceSow outdoors · Feb 21 – Mar 7
Carrots, beetsSow outdoors · Feb 28 – Mar 14
TomatoesStart indoors · Jan 24 – Feb 7
TomatoesTransplant · Mar 28 – Apr 11
Peppers, eggplantStart indoors · Jan 10 – Jan 24
Peppers, eggplantTransplant · Apr 4 – Apr 18
BeansSow outdoors · Mar 28 – Apr 11
Sweet cornSow outdoors · Mar 28 – Apr 11
Cucumbers, squashSow outdoors · Mar 28 – Apr 11
Fall lettuce, spinachSow outdoors · Sep 17 – Oct 1
GarlicPlant cloves · Oct 29 – Dec 3
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 21) and first fall frost (Nov 12) 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 92301 came on Feb 1 — 4 days earlier than the 1991–2020 average (Feb 5).

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 Adelanto, CA

The soil mapped at the center of ZIP 92301 is Typic Haplargids — cobbly fine sandy loam, well drained.

TextureCobbly fine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.5slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.2%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Typic Haplargids and Lithic Haplargids; thermic hills and mountains.

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 92301; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Adelanto, CA

Summer high98 °Faverage high, July
Winter low31 °Faverage low, December
Hot days106days a year at 90 °F or more
Freezing nights71nights a year at 32 °F or less
Growing degree days4,752base 50 °F — the season’s usable heat
Longest day14 h 29 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
Precipitation5.4 inper year, rain and melted snow
Snowfall1 inper year; 1 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 57 °F, low 32 °F 57°32° JanFebruary: average high 60 °F, low 35 °F 60°35° FebMarch: average high 66 °F, low 40 °F 66°40° MarApril: average high 72 °F, low 43 °F 72°43° AprMay: average high 81 °F, low 50 °F 81°50° MayJune: average high 91 °F, low 58 °F 91°58° JunJuly: average high 98 °F, low 64 °F 98°64° JulAugust: average high 97 °F, low 63 °F 97°63° AugSeptember: average high 90 °F, low 57 °F 90°57° SepOctober: average high 78 °F, low 46 °F 78°46° OctNovember: average high 66 °F, low 38 °F 66°38° NovDecember: average high 56 °F, low 31 °F 56°31° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.88 in precipitation, 0.6 in snowfall 0.9❄1 JanFebruary: 1.06 in precipitation, 0.2 in snowfall 1.1 FebMarch: 0.61 in precipitation, 0.1 in snowfall 0.6 MarApril: 0.27 in precipitation 0.3 AprMay: 0.20 in precipitation 0.2 MayJune: 0.06 in precipitation 0.1 JunJuly: 0.21 in precipitation 0.2 JulAugust: 0.16 in precipitation 0.2 AugSeptember: 0.28 in precipitation 0.3 SepOctober: 0.43 in precipitation 0.4 OctNovember: 0.29 in precipitation 0.3 NovDecember: 0.96 in precipitation, 0.2 in snowfall 1.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: El Mirage, CA (7 mi away); precipitation: El Mirage, CA (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

923948b
Victorville, CA · 12 mi
923688b
Oro Grande, CA · 12 mi
923428b
Helendale, CA · 13 mi
923928b
Victorville, CA · 14 mi
923718b
Phelan, CA · 15 mi
923728b
Pinon Hills, CA · 15 mi
923938b
Victorville, CA · 16 mi
923298b
Phelan, CA · 16 mi

California planting zones →

Questions about 92301

What planting zone is ZIP code 92301?

ZIP code 92301 (Adelanto, 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 Adelanto, CA?

The median last spring frost (32 °F) near 92301 is March 21; after April 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, El Mirage station.

When is the first frost in Adelanto, CA?

The median first fall frost near 92301 is November 12, giving a median frost-free growing season of 235 days.

When should I plant tomatoes in 92301?

Start tomato seeds indoors around Jan 24 – Feb 7 and set transplants outside around Mar 28 – Apr 11, one to three weeks after the median last frost.

How much rain and snow does 92301 get?

About 5.4 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, El Mirage station).

How hot do summers get in Adelanto, CA?

The average high peaks at 98 °F in July, with about 106 days a year at 90 °F or more.

What kind of soil does 92301 have?

The USDA soil survey maps Typic Haplargids at the center of ZIP 92301: cobbly fine sandy loam, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Adelanto, CA in 2026?

Spring leaf-out near 92301 came on Feb 1 in 2026, 4 days earlier than the 1991–2020 average (Feb 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Adelanto, CA?

Intermediate onions: the longest day near 92301 is 14 h 29 min, so day-neutral types bulb best; long-day varieties may not bulb fully.