When is the last frost in Chino Hills, CA?

The average last spring frost (50% probability of 32°F) in Chino Hills is around January 17, based on NOAA/NCEI 1991–2020 normals at the Chino Ap, CA station (5.6 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 Hills?

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

What planting zone is Chino Hills, CA?

Chino Hills is in USDA plant hardiness zone 10a (average annual extreme minimum temperature 30 to 35°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Chino Hills?

In Chino Hills, CA the warmest month is August (avg high 88.8°F) and the coldest is December (avg low 48.2°F). It averages about 13.5″ of precipitation a year.

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Chino Hills, CA Planting Calendar & Frost Dates

USDA hardiness zone 10a · ZIP 91709 · elevation 72′ · NOAA & USDA data

Chino Hills is in USDA hardiness zone 10a (winters can dip to 30 to 35°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 88.8°F); the coldest is December (avg low 48.2°F). It averages 13.5″ 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

10a

min temp 30 to 35°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 88.8°F

Month-by-month typical weather in Chino Hills

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Anaheim, CA (8.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	71	48.9	59.9	3.2
February	71	49.3	60.2	3.1
March	73.7	51.4	62.6	1.8
April	76.6	54.1	65.3	0.7
May	78	58.2	68.1	0.4
June	81.7	61.7	71.7	0.1
July	86.8	65.6	76.2	0.1
August	88.8	66	77.4	0
September	87.8	64.1	75.9	0.2
October	83.4	59.3	71.3	0.6
November	76.8	53	64.9	1
December	70.6	48.2	59.4	2.4

What to plant when in Chino Hills

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 Hills'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, CA Yorba Linda, CA Diamond Bar, CA Pomona, CA Brea, CA Placentia, CA Montclair, CA Orange, 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, 5.6 mi (confidence: high). Monthly weather normals: Anaheim, CA, 8.6 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.