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

Planting zone for 92341 — Green Valley Lake, CA

ZIP code 92341 (Green Valley Lake, San Bernardino County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is May 5 and the first fall frost November 2.

Where ZIP 92341 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.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostMay 5
First frostNov 2
2012 zone7b

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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Green Valley Lake, 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 Green Valley Lake, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 5median — 50% chance of a later frost
Safe for tender plantsMay 31only 10% chance of frost after
First fall frostNovember 2median — 10% chance by Oct 12
Growing season176 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 11 and returns around November 16.

From the NOAA station Lake Arrowhead, CA — 7 miles away, elevation 5,207 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 92341

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 24 – Apr 7
SpinachSow outdoors · Mar 24 – Apr 14
Broccoli, cabbageStart indoors · Feb 24 – Mar 10
Broccoli, cabbageTransplant · Apr 14 – Apr 28
Onion setsPlant outdoors · Apr 7 – Apr 21
PotatoesPlant outdoors · Apr 14 – Apr 28
LettuceSow outdoors · Apr 7 – Apr 21
Carrots, beetsSow outdoors · Apr 14 – Apr 28
TomatoesStart indoors · Mar 10 – Mar 24
TomatoesTransplant · May 12 – May 26
Peppers, eggplantStart indoors · Feb 24 – Mar 10
Peppers, eggplantTransplant · May 19 – Jun 2
BeansSow outdoors · May 12 – May 26
Sweet cornSow outdoors · May 12 – May 26
Cucumbers, squashSow outdoors · May 12 – May 26
Fall lettuce, spinachSow outdoors · Sep 7 – Sep 21
GarlicPlant cloves · Oct 19 – Nov 23
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Nov 2) 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 92341 came on Feb 20 — 12 days earlier than the 1991–2020 average (Mar 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 Green Valley Lake, CA

The soil mapped at the center of ZIP 92341 is Pacifico family — loamy coarse sand, somewhat excessively drained.

TextureLoamy coarse sanddrains and warms fast; dries out and needs more feeding
pH6.7neutral; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Pacifico-Preston families complex, 2 to 30 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 92341; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Green Valley Lake, CA

Summer high82 °Faverage high, August
Winter low29 °Faverage low, January
Hot days11days a year at 90 °F or more
Freezing nights105nights a year at 32 °F or less
Growing degree days2,367base 50 °F — the season’s usable heat
Longest day14 h 27 mindaylight on June 21
Shortest day9 h 52 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation36.3 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 44 °F, low 29 °F 44°29° JanFebruary: average high 45 °F, low 30 °F 45°30° FebMarch: average high 52 °F, low 32 °F 52°32° MarApril: average high 60 °F, low 36 °F 60°36° AprMay: average high 67 °F, low 41 °F 67°41° MayJune: average high 76 °F, low 49 °F 76°49° JunJuly: average high 81 °F, low 57 °F 81°57° JulAugust: average high 82 °F, low 57 °F 82°57° AugSeptember: average high 74 °F, low 52 °F 74°52° SepOctober: average high 63 °F, low 43 °F 63°43° OctNovember: average high 52 °F, low 34 °F 52°34° NovDecember: average high 43 °F, low 29 °F 43°29° Dec

Precipitation by month inches

0″2″4″6″8″10″January: 9.41 in precipitation 9.4 JanFebruary: 8.36 in precipitation 8.4 FebMarch: 6.18 in precipitation 6.2 MarApril: 2.62 in precipitation 2.6 AprMay: 0.78 in precipitation 0.8 MayJune: 0.08 in precipitation 0.1 JunJuly: 0.16 in precipitation 0.2 JulAugust: 0.24 in precipitation 0.2 AugSeptember: 0.20 in precipitation 0.2 SepOctober: 0.57 in precipitation 0.6 OctNovember: 2.76 in precipitation 2.8 NovDecember: 4.92 in precipitation 4.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Lake Arrowhead, CA (7 mi away); precipitation: Lake Arrowhead 1.5 Se, CA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

923828a
Running Springs, CA · 4 mi
923337a
Fawnskin, CA · 5 mi
923218a
Cedar Glen, CA · 5 mi
923157b
Big Bear Lake, CA · 7 mi
923528b
Lake Arrowhead, CA · 7 mi
923178a
Blue Jay, CA · 8 mi
923788a
Rimforest, CA · 9 mi
923858a
Skyforest, CA · 10 mi

California planting zones →

Questions about 92341

What planting zone is ZIP code 92341?

ZIP code 92341 (Green Valley Lake, CA) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Green Valley Lake, CA?

The median last spring frost (32 °F) near 92341 is May 5; after May 31 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Lake Arrowhead station.

When is the first frost in Green Valley Lake, CA?

The median first fall frost near 92341 is November 2, giving a median frost-free growing season of 176 days.

When should I plant tomatoes in 92341?

Start tomato seeds indoors around Mar 10 – Mar 24 and set transplants outside around May 12 – May 26, one to three weeks after the median last frost.

How much rain and snow does 92341 get?

About 36.3 inches of precipitation a year (NOAA 1991–2020 normals, Lake Arrowhead 1.5 Se station).

How hot do summers get in Green Valley Lake, CA?

The average high peaks at 82 °F in August, with about 11 days a year at 90 °F or more.

What kind of soil does 92341 have?

The USDA soil survey maps Pacifico family at the center of ZIP 92341: loamy coarse sand, somewhat excessively drained, pH about 6.7 (neutral).

Did spring come early in Green Valley Lake, CA in 2026?

Spring leaf-out near 92341 came on Feb 20 in 2026, 12 days earlier than the 1991–2020 average (Mar 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Green Valley Lake, CA?

Intermediate onions: the longest day near 92341 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.