When is the last frost in Campbell, CA?

The average last spring frost (50% probability of 32°F) in Campbell is around February 2, based on NOAA/NCEI 1991–2020 normals at the Los Gatos, CA station (3.3 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 Campbell?

The average first fall frost in Campbell, CA is around December 6, giving roughly a 310-day frost-free growing season.

What planting zone is Campbell, CA?

Campbell 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 Campbell?

In Campbell, CA the warmest month is July (avg high 84.9°F) and the coldest is January (avg low 39.5°F). It averages about 22.2″ of precipitation a year.

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Campbell, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 95008 · elevation 111′ · NOAA & USDA data

Campbell is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 310 days between the average last spring frost (February 2) and first fall frost (December 6). The warmest month is July (avg high 84.9°F); the coldest is January (avg low 39.5°F). It averages 22.2″ 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

February 2

avg (50% prob, 32°F)

First fall frost

December 6

avg (50% prob, 32°F)

Growing season

310 days

frost-free window

Warmest month

July

avg high 84.9°F

Month-by-month typical weather in Campbell

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Los Gatos, CA (3.3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	58.5	39.5	49	5
February	61.9	41.3	51.6	4.9
March	66.3	43.1	54.7	3.4
April	70.3	45.1	57.7	1.4
May	75.5	49.4	62.4	0.5
June	81.7	52.5	67.1	0.2
July	84.9	55.9	70.4	0
August	84.5	55.8	70.2	0
September	82.7	53.8	68.2	0.1
October	75.5	48.9	62.2	0.8
November	64.6	42.7	53.6	2
December	57.7	39.5	48.6	4

What to plant when in Campbell

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 22 · Transplant out: February 9
Peppers	warm	Start seeds indoors: December 8 · Transplant out: February 16
Cucumbers	warm	Direct sow: February 9
Zucchini / squash	warm	Direct sow: February 9
Bush beans	warm	Direct sow: February 9
Sweet corn	warm	Direct sow: February 9
Basil	warm	Transplant out: February 9
Peas	cool	Sow (spring): December 29 · Sow (fall): October 11
Spinach	cool	Sow (spring): December 22 · Sow (fall): October 11
Lettuce	cool	Sow (spring): January 5 · Sow (fall): October 11
Kale	cool	Transplant (spring): January 12 · Sow (fall): September 27
Broccoli	cool	Transplant (spring): January 19
Carrots	cool	Sow (spring): January 12 · Sow (fall): September 27
Onions	cool	Transplant (spring): January 5
Potatoes	cool	Plant seed potatoes: January 19
Radishes	cool	Sow (spring): January 5 · Sow (fall): October 25

Dates are computed from Campbell'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 — Los Gatos, CA, 3.3 mi (confidence: high). Monthly weather normals: Los Gatos, CA, 3.3 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.