When is the last frost in Chino, CA?

The average last spring frost (50% probability of 32°F) in Chino is around January 17, based on NOAA/NCEI 1991–2020 normals at the Chino Ap, CA station (1.6 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 Chino?

The average first fall frost in Chino, CA is around December 19, giving roughly a 335-day frost-free growing season.

What planting zone is Chino, CA?

Chino is in USDA plant hardiness zone 9b (average annual extreme minimum temperature 25 to 30°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Chino?

In Chino, CA the warmest month is August (avg high 96.3°F) and the coldest is December (avg low 40.4°F). It averages about 10″ of precipitation a year.

Home › California › Chino

Chino, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 91708 · elevation 198′ · NOAA & USDA data

Chino is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 335 days between the average last spring frost (January 17) and first fall frost (December 19). The warmest month is August (avg high 96.3°F); the coldest is December (avg low 40.4°F). It averages 10″ 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 25 to 30°F

Last spring frost

January 17

avg (50% prob, 32°F)

First fall frost

December 19

avg (50% prob, 32°F)

Growing season

335 days

frost-free window

Warmest month

August

avg high 96.3°F

Month-by-month typical weather in Chino

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Chino Ap, CA (1.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	69.5	41.7	55.6	2.2	–
February	69.8	42.9	56.4	2.7	–
March	72.5	45.8	59.1	1.4	–
April	77	48.7	62.8	0.6	–
May	81.1	54.3	67.7	0.2	–
June	87.6	58.5	73	0	–
July	93.7	62.9	78.3	0.1	–
August	96.3	63.2	79.8	0	–
September	92.7	60.4	76.5	0.1	–
October	84.5	53.3	68.9	0.5	–
November	76.3	45.1	60.7	0.6	–
December	68.7	40.4	54.6	1.7	–

What to plant when in Chino

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 6 · Transplant out: January 24
Peppers	warm	Start seeds indoors: November 22 · Transplant out: January 31
Cucumbers	warm	Direct sow: January 24
Zucchini / squash	warm	Direct sow: January 24
Bush beans	warm	Direct sow: January 24
Sweet corn	warm	Direct sow: January 24
Basil	warm	Transplant out: January 24
Peas	cool	Sow (spring): December 13 · Sow (fall): October 24
Spinach	cool	Sow (spring): December 6 · Sow (fall): October 24
Lettuce	cool	Sow (spring): December 20 · Sow (fall): October 24
Kale	cool	Transplant (spring): December 27 · Sow (fall): October 10
Broccoli	cool	Transplant (spring): January 3
Carrots	cool	Sow (spring): December 27 · Sow (fall): October 10
Onions	cool	Transplant (spring): December 20
Potatoes	cool	Plant seed potatoes: January 3
Radishes	cool	Sow (spring): December 20 · Sow (fall): November 7

Dates are computed from Chino'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.

Nearby cities in California

Chino Hills, CA Corona, CA Montclair, CA Pomona, CA Yorba Linda, CA Diamond Bar, CA Brea, CA Rancho Cucamonga, CA

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 — Chino Ap, CA, 1.6 mi (confidence: high). Monthly weather normals: Chino Ap, CA, 1.6 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.