When is the last frost in Hemet, CA?

The average last spring frost (50% probability of 32°F) in Hemet is around January 10, based on NOAA/NCEI 1991–2020 normals at the Hemet, 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 Hemet?

The average first fall frost in Hemet, CA is around December 23, giving roughly a 350-day frost-free growing season.

What planting zone is Hemet, CA?

Hemet 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 Hemet?

In Hemet, CA the warmest month is August (avg high 96.7°F) and the coldest is December (avg low 43.1°F). It averages about 11.8″ of precipitation a year.

Home › California › Hemet

Hemet, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 92543 · elevation 552′ · NOAA & USDA data

Hemet is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 350 days between the average last spring frost (January 10) and first fall frost (December 23). The warmest month is August (avg high 96.7°F); the coldest is December (avg low 43.1°F). It averages 11.8″ 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 10

avg (50% prob, 32°F)

First fall frost

December 23

avg (50% prob, 32°F)

Growing season

350 days

frost-free window

Warmest month

August

avg high 96.7°F

Month-by-month typical weather in Hemet

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Hemet, CA (5.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	66.3	44.2	55.2	2.4
February	66.5	46	56.2	2.8
March	70.7	47.3	59	1.6
April	75.4	49.5	62.4	0.7
May	80.8	54.4	67.6	0.4
June	89.1	56	72.6	0.1
July	95.6	64.7	80.2	0.2
August	96.7	65.6	81.1	0.2
September	92.2	62.1	77.2	0.4
October	82.4	55.3	68.8	0.5
November	73.2	48.7	60.9	0.7
December	65.2	43.1	54.1	1.7

What to plant when in Hemet

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: November 29 · Transplant out: January 17
Peppers	warm	Start seeds indoors: November 15 · Transplant out: January 24
Cucumbers	warm	Direct sow: January 17
Zucchini / squash	warm	Direct sow: January 17
Bush beans	warm	Direct sow: January 17
Sweet corn	warm	Direct sow: January 17
Basil	warm	Transplant out: January 17
Peas	cool	Sow (spring): December 6 · Sow (fall): October 28
Spinach	cool	Sow (spring): November 29 · Sow (fall): October 28
Lettuce	cool	Sow (spring): December 13 · Sow (fall): October 28
Kale	cool	Transplant (spring): December 20 · Sow (fall): October 14
Broccoli	cool	Transplant (spring): December 27
Carrots	cool	Sow (spring): December 20 · Sow (fall): October 14
Onions	cool	Transplant (spring): December 13
Potatoes	cool	Plant seed potatoes: December 27
Radishes	cool	Sow (spring): December 13 · Sow (fall): November 11

Dates are computed from Hemet'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 — Hemet, CA, 5.6 mi (confidence: high). Monthly weather normals: Hemet, CA, 5.6 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.