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

Planting zone for 93260 — Posey, CA

ZIP code 93260 (Posey, Tulare County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is May 11 and the first fall frost October 17.

Where ZIP 93260 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.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostMay 11
First frostOct 17
2012 zone8b

Was 8b 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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Posey, 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 Posey, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 11median — 50% chance of a later frost
Safe for tender plantsJune 6only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Sep 30
Growing season155 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 19 and returns around November 2.

From the NOAA station Glennville, CA — 7 miles away, elevation 3,140 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 93260

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 30 – Apr 13
SpinachSow outdoors · Mar 30 – Apr 20
Broccoli, cabbageStart indoors · Mar 2 – Mar 16
Broccoli, cabbageTransplant · Apr 20 – May 4
Onion setsPlant outdoors · Apr 13 – Apr 27
PotatoesPlant outdoors · Apr 20 – May 4
LettuceSow outdoors · Apr 13 – Apr 27
Carrots, beetsSow outdoors · Apr 20 – May 4
TomatoesStart indoors · Mar 16 – Mar 30
TomatoesTransplant · May 18 – Jun 1
Peppers, eggplantStart indoors · Mar 2 – Mar 16
Peppers, eggplantTransplant · May 25 – Jun 8
BeansSow outdoors · May 18 – Jun 1
Sweet cornSow outdoors · May 18 – Jun 1
Cucumbers, squashSow outdoors · May 18 – Jun 1
Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5
GarlicPlant cloves · Oct 3 – Nov 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 11) and first fall frost (Oct 17) 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 93260 came on Feb 1 — 7 days earlier than the 1991–2020 average (Feb 8).

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 Posey, CA

The soil mapped at the center of ZIP 93260 is Crouch — coarse sandy loam, well drained.

TextureCoarse sandy loamdrains and warms fast; dries out and needs more feeding
pH6.1slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Crouch-Rock outcrop complex, 15 to 50 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 93260; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Posey, CA

Summer high89 °Faverage high, July
Winter low27 °Faverage low, December
Hot days50days a year at 90 °F or more
Freezing nights108nights a year at 32 °F or less
Growing degree days2,702base 50 °F — the season’s usable heat
Longest day14 h 35 mindaylight on June 21
Shortest day9 h 44 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation19.4 inper year, rain and melted snow
Snowfall6 inper year; 1 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 57 °F, low 28 °F 57°28° JanFebruary: average high 57 °F, low 30 °F 57°30° FebMarch: average high 60 °F, low 33 °F 60°33° MarApril: average high 64 °F, low 35 °F 64°35° AprMay: average high 72 °F, low 41 °F 72°41° MayJune: average high 82 °F, low 46 °F 82°46° JunJuly: average high 89 °F, low 52 °F 89°52° JulAugust: average high 89 °F, low 50 °F 89°50° AugSeptember: average high 84 °F, low 45 °F 84°45° SepOctober: average high 73 °F, low 38 °F 73°38° OctNovember: average high 62 °F, low 32 °F 62°32° NovDecember: average high 55 °F, low 27 °F 55°27° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 3.65 in precipitation, 1.3 in snowfall 3.6❄1 JanFebruary: 3.53 in precipitation, 1.6 in snowfall 3.5❄2 FebMarch: 3.09 in precipitation, 1.6 in snowfall 3.1❄2 MarApril: 1.73 in precipitation, 0.4 in snowfall 1.7 AprMay: 0.83 in precipitation 0.8 MayJune: 0.19 in precipitation 0.2 JunJuly: 0.08 in precipitation 0.1 JulAugust: 0.08 in precipitation 0.1 AugSeptember: 0.13 in precipitation 0.1 SepOctober: 0.86 in precipitation 0.9 OctNovember: 1.94 in precipitation, 0.1 in snowfall 1.9 NovDecember: 3.30 in precipitation, 1.2 in snowfall 3.3❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Glennville, CA (7 mi away); precipitation: Glennville, CA (7 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.

932077b
California Hot Springs, CA · 6 mi
932268b
Glennville, CA · 7 mi
932388b
Kernville, CA · 9 mi
932858b
Wofford Heights, CA · 11 mi
932879b
Woody, CA · 16 mi
932579b
Porterville, CA · 17 mi
932409a
Lake Isabella, CA · 18 mi
932058b
Bodfish, CA · 20 mi

California planting zones →

Questions about 93260

What planting zone is ZIP code 93260?

ZIP code 93260 (Posey, CA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Posey, CA?

The median last spring frost (32 °F) near 93260 is May 11; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Glennville station.

When is the first frost in Posey, CA?

The median first fall frost near 93260 is October 17, giving a median frost-free growing season of 155 days.

When should I plant tomatoes in 93260?

Start tomato seeds indoors around Mar 16 – Mar 30 and set transplants outside around May 18 – Jun 1, one to three weeks after the median last frost.

How much rain and snow does 93260 get?

About 19.4 inches of precipitation a year and 6 inches of snowfall (NOAA 1991–2020 normals, Glennville station).

How hot do summers get in Posey, CA?

The average high peaks at 89 °F in July, with about 50 days a year at 90 °F or more.

What kind of soil does 93260 have?

The USDA soil survey maps Crouch at the center of ZIP 93260: coarse sandy loam, well drained, pH about 6.1 (slightly acidic).

Did spring come early in Posey, CA in 2026?

Spring leaf-out near 93260 came on Feb 1 in 2026, 7 days earlier than the 1991–2020 average (Feb 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Posey, CA?

Intermediate onions: the longest day near 93260 is 14 h 35 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 93260 change?

Yes. The 2012 USDA map put 93260 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.