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

Planting zone for 92368 — Oro Grande, CA

ZIP code 92368 (Oro Grande, San Bernardino County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 18 and the first fall frost November 11.

Where ZIP 92368 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 18
First frostNov 11
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 Oro Grande, 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 Oro Grande, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 18median — 50% chance of a later frost
Safe for tender plantsApril 12only 10% chance of frost after
First fall frostNovember 11median — 10% chance by Oct 27
Growing season233 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 22 and returns around November 24.

From the NOAA station Victorville, CA — 9 miles away, elevation 2,881 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 92368

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 4 – Feb 18
SpinachSow outdoors · Feb 4 – Feb 25
Broccoli, cabbageStart indoors · Jan 7 – Jan 21
Broccoli, cabbageTransplant · Feb 25 – Mar 11
Onion setsPlant outdoors · Feb 18 – Mar 4
PotatoesPlant outdoors · Feb 25 – Mar 11
LettuceSow outdoors · Feb 18 – Mar 4
Carrots, beetsSow outdoors · Feb 25 – Mar 11
TomatoesStart indoors · Jan 21 – Feb 4
TomatoesTransplant · Mar 25 – Apr 8
Peppers, eggplantStart indoors · Jan 7 – Jan 21
Peppers, eggplantTransplant · Apr 1 – Apr 15
BeansSow outdoors · Mar 25 – Apr 8
Sweet cornSow outdoors · Mar 25 – Apr 8
Cucumbers, squashSow outdoors · Mar 25 – Apr 8
Fall lettuce, spinachSow outdoors · Sep 16 – Sep 30
GarlicPlant cloves · Oct 28 – Dec 2
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 18) and first fall frost (Nov 11) 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 92368 came on Jan 29 — 4 days earlier than the 1991–2020 average (Feb 2).

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 Oro Grande, CA

The soil mapped at the center of ZIP 92368 is Joshua — loam, well drained.

TextureLoama good balance for most vegetables
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.25%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: JOSHUA LOAM, 2 TO 5 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 92368; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Oro Grande, CA

Summer high98 °Faverage high, July
Winter low33 °Faverage low, January
Hot days119days a year at 90 °F or more
Freezing nights54nights a year at 32 °F or less
Growing degree days4,932base 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
Precipitation5.6 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 33 °F 58°33° JanFebruary: average high 61 °F, low 36 °F 61°36° FebMarch: average high 67 °F, low 40 °F 67°40° MarApril: average high 73 °F, low 44 °F 73°44° AprMay: average high 81 °F, low 51 °F 81°51° 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 91 °F, low 58 °F 91°58° SepOctober: average high 79 °F, low 47 °F 79°47° OctNovember: average high 67 °F, low 38 °F 67°38° NovDecember: average high 57 °F, low 33 °F 57°33° Dec

Precipitation by month inches

0″1″2″January: 0.97 in precipitation 1.0 JanFebruary: 1.27 in precipitation 1.3 FebMarch: 0.78 in precipitation 0.8 MarApril: 0.33 in precipitation 0.3 AprMay: 0.09 in precipitation 0.1 MayJune: 0.04 in precipitation 0.0 JunJuly: 0.22 in precipitation 0.2 JulAugust: 0.11 in precipitation 0.1 AugSeptember: 0.16 in precipitation 0.2 SepOctober: 0.31 in precipitation 0.3 OctNovember: 0.35 in precipitation 0.3 NovDecember: 0.94 in precipitation 0.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Victorville, CA (9 mi away); precipitation: Victorville, CA (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

923428b
Helendale, CA · 7 mi
923948b
Victorville, CA · 7 mi
923938b
Victorville, CA · 9 mi
923958b
Victorville, CA · 11 mi
923018b
Adelanto, CA · 12 mi
923078b
Apple Valley, CA · 12 mi
923928b
Victorville, CA · 14 mi
923408b
Hesperia, CA · 16 mi

California planting zones →

Questions about 92368

What planting zone is ZIP code 92368?

ZIP code 92368 (Oro Grande, 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 Oro Grande, CA?

The median last spring frost (32 °F) near 92368 is March 18; after April 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Victorville station.

When is the first frost in Oro Grande, CA?

The median first fall frost near 92368 is November 11, giving a median frost-free growing season of 233 days.

When should I plant tomatoes in 92368?

Start tomato seeds indoors around Jan 21 – Feb 4 and set transplants outside around Mar 25 – Apr 8, one to three weeks after the median last frost.

How much rain and snow does 92368 get?

About 5.6 inches of precipitation a year (NOAA 1991–2020 normals, Victorville station).

How hot do summers get in Oro Grande, CA?

The average high peaks at 98 °F in July, with about 119 days a year at 90 °F or more.

What kind of soil does 92368 have?

The USDA soil survey maps Joshua at the center of ZIP 92368: loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Oro Grande, CA in 2026?

Spring leaf-out near 92368 came on Jan 29 in 2026, 4 days earlier than the 1991–2020 average (Feb 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Oro Grande, CA?

Intermediate onions: the longest day near 92368 is 14 h 29 min, so day-neutral types bulb best; long-day varieties may not bulb fully.