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

Planting zone for 92345 — Hesperia, CA

ZIP code 92345 (Hesperia, San Bernardino County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is February 28 and the first fall frost December 1.

Where ZIP 92345 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 frostFeb 28
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 Hesperia, 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 Hesperia, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 28median — 50% chance of a later frost
Safe for tender plantsApril 3only 10% chance of frost after
First fall frostDecember 1median — 10% chance by Nov 11
Growing season270 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 30 and returns around December 14.

From the NOAA station Hesperia 2e, CA — 5 miles away, elevation 3,055 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 92345

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 17 – Jan 31
SpinachSow outdoors · Jan 17 – Feb 7
Broccoli, cabbageStart indoors · Dec 20 – Jan 3
Broccoli, cabbageTransplant · Feb 7 – Feb 21
Onion setsPlant outdoors · Jan 31 – Feb 14
PotatoesPlant outdoors · Feb 7 – Feb 21
LettuceSow outdoors · Jan 31 – Feb 14
Carrots, beetsSow outdoors · Feb 7 – Feb 21
TomatoesStart indoors · Jan 3 – Jan 17
TomatoesTransplant · Mar 7 – Mar 21
Peppers, eggplantStart indoors · Dec 20 – Jan 3
Peppers, eggplantTransplant · Mar 14 – Mar 28
BeansSow outdoors · Mar 7 – Mar 21
Sweet cornSow outdoors · Mar 7 – Mar 21
Cucumbers, squashSow outdoors · Mar 7 – Mar 21
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 (Feb 28) 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 92345 came on Jan 31 — 3 days earlier than the 1991–2020 average (Feb 3).

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 Hesperia, CA

The soil mapped at the center of ZIP 92345 is Haploxeralfs — variable, excessively drained.

TextureVariabletop layer
DrainageExcessively drainednatural drainage class
Farmland classNot prime farmlandUSDA classification

Map unit: GULLIED LAND-HAPLOXERALFS ASSOCIATION.

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 92345; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hesperia, CA

Summer high97 °Faverage high, July
Winter low35 °Faverage low, December
Hot days108days a year at 90 °F or more
Freezing nights32nights a year at 32 °F or less
Growing degree days5,367base 50 °F — the season’s usable heat
Longest day14 h 27 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
Precipitation11.1 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 60 °F, low 37 °F 60°37° JanFebruary: average high 62 °F, low 39 °F 62°39° FebMarch: average high 69 °F, low 42 °F 69°42° MarApril: average high 75 °F, low 46 °F 75°46° AprMay: average high 82 °F, low 53 °F 82°53° MayJune: average high 92 °F, low 59 °F 92°59° JunJuly: average high 97 °F, low 65 °F 97°65° JulAugust: average high 97 °F, low 65 °F 97°65° AugSeptember: average high 91 °F, low 61 °F 91°61° SepOctober: average high 81 °F, low 51 °F 81°51° OctNovember: average high 67 °F, low 42 °F 67°42° NovDecember: average high 59 °F, low 35 °F 59°35° Dec

Precipitation by month inches

0″1″2″3″January: 2.43 in precipitation 2.4 JanFebruary: 2.46 in precipitation 2.5 FebMarch: 1.42 in precipitation 1.4 MarApril: 0.76 in precipitation 0.8 AprMay: 0.18 in precipitation 0.2 MayJune: 0.09 in precipitation 0.1 JunJuly: 0.22 in precipitation 0.2 JulAugust: 0.11 in precipitation 0.1 AugSeptember: 0.21 in precipitation 0.2 SepOctober: 0.61 in precipitation 0.6 OctNovember: 0.63 in precipitation 0.6 NovDecember: 1.98 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hesperia 2e, CA (5 mi away); precipitation: Hesperia 3.9 Sw, CA (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.

923408b
Hesperia, CA · 5 mi
923448b
Hesperia, CA · 6 mi
923228b
Cedarpines Park, CA · 7 mi
923258b
Crestline, CA · 8 mi
923918a
Twin Peaks, CA · 9 mi
923528b
Lake Arrowhead, CA · 10 mi
923928b
Victorville, CA · 10 mi
923088b
Apple Valley, CA · 10 mi

All 3 ZIP codes in Hesperia → · California planting zones →

Questions about 92345

What planting zone is ZIP code 92345?

ZIP code 92345 (Hesperia, 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 Hesperia, CA?

The median last spring frost (32 °F) near 92345 is February 28; after April 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hesperia 2e station.

When is the first frost in Hesperia, CA?

The median first fall frost near 92345 is December 1, giving a median frost-free growing season of 270 days.

When should I plant tomatoes in 92345?

Start tomato seeds indoors around Jan 3 – Jan 17 and set transplants outside around Mar 7 – Mar 21, one to three weeks after the median last frost.

How much rain and snow does 92345 get?

About 11.1 inches of precipitation a year (NOAA 1991–2020 normals, Hesperia 3.9 Sw station).

How hot do summers get in Hesperia, CA?

The average high peaks at 97 °F in July, with about 108 days a year at 90 °F or more.

What kind of soil does 92345 have?

The USDA soil survey maps Haploxeralfs at the center of ZIP 92345: variable, excessively drained.

Did spring come early in Hesperia, CA in 2026?

Spring leaf-out near 92345 came on Jan 31 in 2026, 3 days earlier than the 1991–2020 average (Feb 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hesperia, CA?

Intermediate onions: the longest day near 92345 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.