Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 92329 — Phelan, CA

ZIP code 92329 (Phelan, San Bernardino County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is May 16 and the first fall frost October 13.

Where ZIP 92329 is

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 frostMay 16

First frostOct 13

2012 zone8a

Was 8a on the 2012 map — half a zone warmer now. 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 Phelan, 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 Phelan, CA

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 16median — 50% chance of a later frost

Safe for tender plantsJune 9only 10% chance of frost after

First fall frostOctober 13median — 10% chance by Sep 25

Growing season151 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 25 and returns around October 30.

From the NOAA station Wrightwood, CA — 6 miles away, elevation 6,001 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 92329

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 4 – Apr 18

SpinachSow outdoors · Apr 4 – Apr 25

Broccoli, cabbageStart indoors · Mar 7 – Mar 21

Broccoli, cabbageTransplant · Apr 25 – May 9

Onion setsPlant outdoors · Apr 18 – May 2

PotatoesPlant outdoors · Apr 25 – May 9

LettuceSow outdoors · Apr 18 – May 2

Carrots, beetsSow outdoors · Apr 25 – May 9

TomatoesStart indoors · Mar 21 – Apr 4

TomatoesTransplant · May 23 – Jun 6

Peppers, eggplantStart indoors · Mar 7 – Mar 21

Peppers, eggplantTransplant · May 30 – Jun 13

BeansSow outdoors · May 23 – Jun 6

Sweet cornSow outdoors · May 23 – Jun 6

Cucumbers, squashSow outdoors · May 23 – Jun 6

Fall lettuce, spinachSow outdoors · Aug 18 – Sep 1

GarlicPlant cloves · Sep 29 – Nov 3

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 16) and first fall frost (Oct 13) 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 92329 came on Feb 3 — 8 days earlier than the 1991–2020 average (Feb 11).

average
Feb 112026
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 Phelan, CA

The soil mapped at the center of ZIP 92329 is Tujunga — sand, somewhat excessively drained.

TextureSanddrains and warms fast; dries out and needs more feeding

pH6.7neutral; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter0.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: TUJUNGA SAND, COOL, 2 TO 9 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 92329; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Phelan, CA

Summer high83 °Faverage high, July

Winter low25 °Faverage low, February

Hot days4days a year at 90 °F or more

Freezing nights159nights a year at 32 °F or less

Growing degree days2,050base 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

Precipitation21.1 inper year, rain and melted snow

Snowfall62 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

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

Nearby ZIP codes

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

923718b

Phelan, CA · 2 mi

923728b

Pinon Hills, CA · 4 mi

923448b

Hesperia, CA · 10 mi

923928b

Victorville, CA · 10 mi

935448b

Llano, CA · 11 mi

923977b

Wrightwood, CA · 11 mi

923588a

Lytle Creek, CA · 12 mi

917598a

Mount Baldy, CA · 13 mi

All 2 ZIP codes in Phelan → · California planting zones →

Questions about 92329

What planting zone is ZIP code 92329?

ZIP code 92329 (Phelan, 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 Phelan, CA?

The median last spring frost (32 °F) near 92329 is May 16; after June 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wrightwood station.

When is the first frost in Phelan, CA?

The median first fall frost near 92329 is October 13, giving a median frost-free growing season of 151 days.

When should I plant tomatoes in 92329?

Start tomato seeds indoors around Mar 21 – Apr 4 and set transplants outside around May 23 – Jun 6, one to three weeks after the median last frost.

How much rain and snow does 92329 get?

About 21.1 inches of precipitation a year and 62 inches of snowfall (NOAA 1991–2020 normals, Wrightwood station).

How hot do summers get in Phelan, CA?

The average high peaks at 83 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 92329 have?

The USDA soil survey maps Tujunga at the center of ZIP 92329: sand, somewhat excessively drained, pH about 6.7 (neutral).

Did spring come early in Phelan, CA in 2026?

Spring leaf-out near 92329 came on Feb 3 in 2026, 8 days earlier than the 1991–2020 average (Feb 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Phelan, CA?

Intermediate onions: the longest day near 92329 is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 92329 change?

Yes. The 2012 USDA map put 92329 in zone 8a; the 2023 map puts it in zone 8b. The newer map uses 1991–2020 data and more weather stations.