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

Planting zone for 93230 — Hanford, CA

ZIP code 93230 (Hanford, Kings County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 7 and the first fall frost December 1.

Where ZIP 93230 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 frostFeb 7
First frostDec 1
2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hanford, 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 Hanford, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 7median — 50% chance of a later frost
Safe for tender plantsMarch 4only 10% chance of frost after
First fall frostDecember 1median — 10% chance by Nov 16
Growing season296 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 12 and returns around December 14.

From the NOAA station Hanford 1 S, CA — 2 miles away, elevation 236 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 93230

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Dec 27 – Jan 10
SpinachSow outdoors · Dec 27 – Jan 17
Broccoli, cabbageStart indoors · Nov 29 – Dec 13
Broccoli, cabbageTransplant · Jan 17 – Jan 31
Onion setsPlant outdoors · Jan 10 – Jan 24
PotatoesPlant outdoors · Jan 17 – Jan 31
LettuceSow outdoors · Jan 10 – Jan 24
Carrots, beetsSow outdoors · Jan 17 – Jan 31
TomatoesStart indoors · Dec 13 – Dec 27
TomatoesTransplant · Feb 14 – Feb 28
Peppers, eggplantStart indoors · Nov 29 – Dec 13
Peppers, eggplantTransplant · Feb 21 – Mar 7
BeansSow outdoors · Feb 14 – Feb 28
Sweet cornSow outdoors · Feb 14 – Feb 28
Cucumbers, squashSow outdoors · Feb 14 – Feb 28
Fall lettuce, spinachSow outdoors · Oct 6 – Oct 20
GarlicPlant cloves · Nov 17 – Dec 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 7) and first fall frost (Dec 1) 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 93230 came on Jan 30 — 3 days earlier than the 1991–2020 average (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 Hanford, CA

The soil mapped at the center of ZIP 93230 is Wasco — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Wasco sandy loam, 0 to 5 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 93230; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hanford, CA

Summer high98 °Faverage high, July
Winter low36 °Faverage low, December
Hot days108days a year at 90 °F or more
Freezing nights24nights a year at 32 °F or less
Growing degree days5,463base 50 °F — the season’s usable heat
Longest day14 h 38 mindaylight on June 21
Shortest day9 h 41 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation8.5 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 56 °F, low 37 °F 56°37° JanFebruary: average high 63 °F, low 40 °F 63°40° FebMarch: average high 69 °F, low 45 °F 69°45° MarApril: average high 75 °F, low 49 °F 75°49° AprMay: average high 84 °F, low 55 °F 84°55° MayJune: average high 92 °F, low 61 °F 92°61° JunJuly: average high 98 °F, low 66 °F 98°66° JulAugust: average high 97 °F, low 64 °F 97°64° AugSeptember: average high 92 °F, low 59 °F 92°59° SepOctober: average high 81 °F, low 51 °F 81°51° OctNovember: average high 67 °F, low 42 °F 67°42° NovDecember: average high 56 °F, low 36 °F 56°36° Dec

Precipitation by month inches

0″1″2″January: 1.79 in precipitation 1.8 JanFebruary: 1.43 in precipitation 1.4 FebMarch: 1.52 in precipitation 1.5 MarApril: 0.72 in precipitation 0.7 AprMay: 0.31 in precipitation 0.3 MayJune: 0.12 in precipitation 0.1 JunJuly: 0.02 in precipitation 0.0 JulAugust: 0.01 in precipitation 0.0 AugSeptember: 0.07 in precipitation 0.1 SepOctober: 0.43 in precipitation 0.4 OctNovember: 0.66 in precipitation 0.7 NovDecember: 1.44 in precipitation 1.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hanford 1 S, CA (2 mi away); precipitation: Hanford 1 S, CA (2 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.

932329a
Hanford, CA · 3 mi
932029a
Armona, CA · 5 mi
932459a
Lemoore, CA · 12 mi
932429a
Laton, CA · 12 mi
932279b
Goshen, CA · 12 mi
932829a
Waukena, CA · 13 mi
936739b
Traver, CA · 14 mi
932779b
Visalia, CA · 14 mi

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

Questions about 93230

What planting zone is ZIP code 93230?

ZIP code 93230 (Hanford, 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 Hanford, CA?

The median last spring frost (32 °F) near 93230 is February 7; after March 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hanford 1 S station.

When is the first frost in Hanford, CA?

The median first fall frost near 93230 is December 1, giving a median frost-free growing season of 296 days.

When should I plant tomatoes in 93230?

Start tomato seeds indoors around Dec 13 – Dec 27 and set transplants outside around Feb 14 – Feb 28, one to three weeks after the median last frost.

How much rain and snow does 93230 get?

About 8.5 inches of precipitation a year (NOAA 1991–2020 normals, Hanford 1 S station).

How hot do summers get in Hanford, CA?

The average high peaks at 98 °F in July, with about 108 days a year at 90 °F or more.

What kind of soil does 93230 have?

The USDA soil survey maps Wasco at the center of ZIP 93230: sandy loam, well drained, pH about 7.0 (neutral).

Did spring come early in Hanford, CA in 2026?

Spring leaf-out near 93230 came on Jan 30 in 2026, 3 days earlier than the 1991–2020 average (Feb 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hanford, CA?

Intermediate onions: the longest day near 93230 is 14 h 38 min, so day-neutral types bulb best; long-day varieties may not bulb fully.