When is the last frost in Hesperia, CA?

The average last spring frost (50% probability of 32°F) in Hesperia is around February 28, based on NOAA/NCEI 1991–2020 normals at the Hesperia 2e, CA station (4.9 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 Hesperia?

The average first fall frost in Hesperia, CA is around December 1, giving roughly a 270-day frost-free growing season.

What planting zone is Hesperia, CA?

Hesperia is in USDA plant hardiness zone 8b (average annual extreme minimum temperature 15 to 20°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Hesperia?

In Hesperia, CA the warmest month is August (avg high 97°F) and the coldest is December (avg low 35.2°F). It averages about 7.9″ of precipitation a year.

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Hesperia, CA Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 92345 · elevation 931′ · NOAA & USDA data

Hesperia is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 270 days between the average last spring frost (February 28) and first fall frost (December 1). The warmest month is August (avg high 97°F); the coldest is December (avg low 35.2°F). It averages 7.9″ 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 15 to 20°F

Last spring frost

February 28

avg (50% prob, 32°F)

First fall frost

December 1

avg (50% prob, 32°F)

Growing season

270 days

frost-free window

Warmest month

August

avg high 97°F

Month-by-month typical weather in Hesperia

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Hesperia 2e, CA (4.9 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	60.2	36.6	48.4	1.5	–
February	61.9	38.8	50.4	1.6	–
March	69.1	41.7	55.4	1.3	–
April	75	45.7	60.4	0.5	–
May	82.3	52.5	67.4	0.2	–
June	91.8	59.2	75.5	0.1	–
July	96.8	65	80.9	0.2	–
August	97	65	81	0.1	–
September	91.4	60.9	76.2	0.2	–
October	80.5	51.2	65.9	0.6	–
November	67.4	41.8	54.6	0.5	–
December	59	35.2	47.1	1.2	–

What to plant when in Hesperia

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 17 · Transplant out: March 7
Peppers	warm	Start seeds indoors: January 3 · Transplant out: March 14
Cucumbers	warm	Direct sow: March 7
Zucchini / squash	warm	Direct sow: March 7
Bush beans	warm	Direct sow: March 7
Sweet corn	warm	Direct sow: March 7
Basil	warm	Transplant out: March 7
Peas	cool	Sow (spring): January 24 · Sow (fall): October 6
Spinach	cool	Sow (spring): January 17 · Sow (fall): October 6
Lettuce	cool	Sow (spring): January 31 · Sow (fall): October 6
Kale	cool	Transplant (spring): February 7 · Sow (fall): September 22
Broccoli	cool	Transplant (spring): February 14
Carrots	cool	Sow (spring): February 7 · Sow (fall): September 22
Onions	cool	Transplant (spring): January 31
Potatoes	cool	Plant seed potatoes: February 14
Radishes	cool	Sow (spring): January 31 · Sow (fall): October 20

Dates are computed from Hesperia'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 — Hesperia 2e, CA, 4.9 mi (confidence: high). Monthly weather normals: Hesperia 2e, CA, 4.9 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.