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

Planting zone for 95387 — Westley, CA

ZIP code 95387 (Westley, Stanislaus County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 25 and the first fall frost November 26.

Where ZIP 95387 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.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostFeb 25
First frostNov 26
2012 zone9b

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 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Westley, 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 Westley, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 25median — 50% chance of a later frost
Safe for tender plantsApril 6only 10% chance of frost after
First fall frostNovember 26median — 10% chance by Nov 8
Growing season272 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 18 and returns around December 11.

From the NOAA station Tracy Carbona, CA — 11 miles away, elevation 135 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 95387

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 14 – Jan 28
SpinachSow outdoors · Jan 14 – Feb 4
Broccoli, cabbageStart indoors · Dec 17 – Dec 31
Broccoli, cabbageTransplant · Feb 4 – Feb 18
Onion setsPlant outdoors · Jan 28 – Feb 11
PotatoesPlant outdoors · Feb 4 – Feb 18
LettuceSow outdoors · Jan 28 – Feb 11
Carrots, beetsSow outdoors · Feb 4 – Feb 18
TomatoesStart indoors · Dec 31 – Jan 14
TomatoesTransplant · Mar 4 – Mar 18
Peppers, eggplantStart indoors · Dec 17 – Dec 31
Peppers, eggplantTransplant · Mar 11 – Mar 25
BeansSow outdoors · Mar 4 – Mar 18
Sweet cornSow outdoors · Mar 4 – Mar 18
Cucumbers, squashSow outdoors · Mar 4 – Mar 18
Fall lettuce, spinachSow outdoors · Oct 1 – Oct 15
GarlicPlant cloves · Nov 12 – Dec 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 25) and first fall frost (Nov 26) 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 95387 came on Jan 30 — about the same time as the 1991–2020 average (Jan 31).

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 Westley, CA

The soil mapped at the center of ZIP 95387 is Vernalis — clay loam, well drained.

TextureClay loamholds water and nutrients; slow to drain and warm up
pH7.5slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Vernalis-Zacharias complex, 0 to 2 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 95387; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Westley, CA

Summer high93 °Faverage high, July
Winter low36 °Faverage low, January
Hot days80days a year at 90 °F or more
Freezing nights26nights a year at 32 °F or less
Growing degree days4,362base 50 °F — the season’s usable heat
Longest day14 h 46 mindaylight on June 21
Shortest day9 h 34 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation12.7 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 57 °F, low 36 °F 57°36° JanFebruary: average high 62 °F, low 39 °F 62°39° FebMarch: average high 68 °F, low 42 °F 68°42° MarApril: average high 73 °F, low 45 °F 73°45° AprMay: average high 80 °F, low 50 °F 80°50° MayJune: average high 88 °F, low 55 °F 88°55° JunJuly: average high 93 °F, low 57 °F 93°57° JulAugust: average high 92 °F, low 56 °F 92°56° AugSeptember: average high 89 °F, low 54 °F 89°54° SepOctober: average high 79 °F, low 48 °F 79°48° OctNovember: average high 67 °F, low 41 °F 67°41° NovDecember: average high 56 °F, low 36 °F 56°36° Dec

Precipitation by month inches

0″1″2″3″January: 2.34 in precipitation 2.3 JanFebruary: 2.57 in precipitation 2.6 FebMarch: 1.72 in precipitation 1.7 MarApril: 0.99 in precipitation 1.0 AprMay: 0.72 in precipitation 0.7 MayJune: 0.15 in precipitation 0.1 JunJuly: 0.00 in precipitation 0.0 JulAugust: 0.03 in precipitation 0.0 AugSeptember: 0.08 in precipitation 0.1 SepOctober: 0.69 in precipitation 0.7 OctNovember: 1.11 in precipitation 1.1 NovDecember: 2.32 in precipitation 2.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Tracy Carbona, CA (11 mi away); precipitation: Tracy Carbona, CA (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

953859b
Vernalis, CA · 4 mi
953589b
Modesto, CA · 8 mi
953049b
Tracy, CA · 11 mi
953639b
Patterson, CA · 12 mi
953379b
Manteca, CA · 13 mi
953789b
Tracy, CA · 13 mi
953689b
Salida, CA · 14 mi
953139b
Crows Landing, CA · 14 mi

California planting zones →

Questions about 95387

What planting zone is ZIP code 95387?

ZIP code 95387 (Westley, CA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

When is the last frost in Westley, CA?

The median last spring frost (32 °F) near 95387 is February 25; after April 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Tracy Carbona station.

When is the first frost in Westley, CA?

The median first fall frost near 95387 is November 26, giving a median frost-free growing season of 272 days.

When should I plant tomatoes in 95387?

Start tomato seeds indoors around Dec 31 – Jan 14 and set transplants outside around Mar 4 – Mar 18, one to three weeks after the median last frost.

How much rain and snow does 95387 get?

About 12.7 inches of precipitation a year (NOAA 1991–2020 normals, Tracy Carbona station).

How hot do summers get in Westley, CA?

The average high peaks at 93 °F in July, with about 80 days a year at 90 °F or more.

What kind of soil does 95387 have?

The USDA soil survey maps Vernalis at the center of ZIP 95387: clay loam, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Westley, CA in 2026?

Spring leaf-out near 95387 came on Jan 30 in 2026, about the same as the 1991–2020 average (Jan 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Westley, CA?

Intermediate onions: the longest day near 95387 is 14 h 46 min, so day-neutral types bulb best; long-day varieties may not bulb fully.