Phelan, CA is in USDA zone 8b across its 2 ZIP codes. The median last spring frost is May 16 and the first fall frost October 13.
Phelan on the zone map
Outlined: its 1 ZIP code areas · 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
ZIP codes2
Last frostMay 16
First frostOct 13
Growing season151 days
8b 2 ZIPs
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, 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 Phelan
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 92371 came on Feb 2 — 4 days earlier than the 1991–2020 average (Feb 6).
average Feb 62026 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 Phelan, CA
The soil mapped at the center of ZIP 92371 is Cajon — sand, somewhat excessively drained.
TextureSanddrains and warms fast; dries out and needs more feeding
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter0.5%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classFarmland of statewide importanceUSDA classification
Map unit: CAJON SAND, 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 92371; 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 (7 mi away); precipitation: Wrightwood, CA (7 mi away). Daylight is calculated from latitude.
Phelan, CA is in USDA hardiness zone 8b on the 2023 map (8b: 15 to 20 °F).
When is the last frost in Phelan, CA?
The median last spring frost is May 16 and the median first fall frost is October 13 (NOAA 1991–2020 normals, Wrightwood station).
When can I plant a garden in Phelan, CA?
Cool-season crops like peas and spinach go in around Apr 4 – Apr 25; tomatoes, peppers, beans and squash after about May 23, once frost risk has passed.
What kind of onions grow in Phelan, CA?
Intermediate onions: the longest day is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
How much rain and snow does Phelan, CA get?
About 21.1 inches of precipitation a year and 62 inches of snowfall (NOAA 1991–2020 normals).