When is the last frost in Hanford, CA?

The average last spring frost (50% probability of 32°F) in Hanford is around February 7, based on NOAA/NCEI 1991–2020 normals at the Hanford 1 S, CA station (1.8 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Hanford?

The average first fall frost in Hanford, CA is around December 1, giving roughly a 296-day frost-free growing season.

What planting zone is Hanford, CA?

Hanford is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Hanford?

In Hanford, CA the warmest month is July (avg high 97.9°F) and the coldest is December (avg low 36°F). It averages about 8.5″ of precipitation a year.

Home › California › Hanford

Hanford, CA Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 93230 · elevation 72′ · NOAA & USDA data

Hanford is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 296 days between the average last spring frost (February 7) and first fall frost (December 1). The warmest month is July (avg high 97.9°F); the coldest is December (avg low 36°F). It averages 8.5″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 20 to 25°F

Last spring frost

February 7

avg (50% prob, 32°F)

First fall frost

December 1

avg (50% prob, 32°F)

Growing season

296 days

frost-free window

Warmest month

July

avg high 97.9°F

Month-by-month typical weather in Hanford

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Hanford 1 S, CA (1.8 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	55.9	37.3	46.6	1.8
February	62.5	40.2	51.3	1.4
March	69.1	44.8	57	1.5
April	75.3	48.6	62	0.7
May	83.7	55.1	69.4	0.3
June	91.9	61.4	76.7	0.1
July	97.9	66	81.9	0
August	97	64.3	80.6	0
September	91.5	59.3	75.4	0.1
October	80.5	50.9	65.7	0.4
November	66.8	41.8	54.3	0.7
December	56.4	36	46.2	1.4

What to plant when in Hanford

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 27 · Transplant out: February 14
Peppers	warm	Start seeds indoors: December 13 · Transplant out: February 21
Cucumbers	warm	Direct sow: February 14
Zucchini / squash	warm	Direct sow: February 14
Bush beans	warm	Direct sow: February 14
Sweet corn	warm	Direct sow: February 14
Basil	warm	Transplant out: February 14
Peas	cool	Sow (spring): January 3 · Sow (fall): October 6
Spinach	cool	Sow (spring): December 27 · Sow (fall): October 6
Lettuce	cool	Sow (spring): January 10 · Sow (fall): October 6
Kale	cool	Transplant (spring): January 17 · Sow (fall): September 22
Broccoli	cool	Transplant (spring): January 24
Carrots	cool	Sow (spring): January 17 · Sow (fall): September 22
Onions	cool	Transplant (spring): January 10
Potatoes	cool	Plant seed potatoes: January 24
Radishes	cool	Sow (spring): January 10 · Sow (fall): October 20

Dates are computed from Hanford's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

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Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Hanford 1 S, CA, 1.8 mi (confidence: high). Monthly weather normals: Hanford 1 S, CA, 1.8 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.