When is the last frost in Pleasanton, CA?

The average last spring frost (50% probability of 32°F) in Pleasanton is around February 15, based on NOAA/NCEI 1991–2020 normals at the Livermore, CA station (3.6 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 Pleasanton?

The average first fall frost in Pleasanton, CA is around December 2, giving roughly a 292-day frost-free growing season.

What planting zone is Pleasanton, CA?

Pleasanton 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 Pleasanton?

In Pleasanton, CA the warmest month is July (avg high 89°F) and the coldest is December (avg low 38.8°F). It averages about 14.6″ of precipitation a year.

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Pleasanton, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 94566 · elevation 120′ · NOAA & USDA data

Pleasanton is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 292 days between the average last spring frost (February 15) and first fall frost (December 2). The warmest month is July (avg high 89°F); the coldest is December (avg low 38.8°F). It averages 14.6″ 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 15

avg (50% prob, 32°F)

First fall frost

December 2

avg (50% prob, 32°F)

Growing season

292 days

frost-free window

Warmest month

July

avg high 89°F

Month-by-month typical weather in Pleasanton

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Livermore, CA (3.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	56.8	39	47.9	2.8
February	61	41	51	2.7
March	65.8	43.3	54.6	2.2
April	70.6	45.7	58.1	1.1
May	76.6	50	63.3	0.5
June	83.9	53.8	68.8	0.1
July	89	56.6	72.8	0
August	88.6	56.6	72.6	0
September	85.9	54.7	70.3	0.1
October	77.2	49.7	63.5	0.8
November	64.9	42.8	53.8	1.5
December	56.9	38.8	47.9	2.7

What to plant when in Pleasanton

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 4 · Transplant out: February 22
Peppers	warm	Start seeds indoors: December 21 · Transplant out: March 1
Cucumbers	warm	Direct sow: February 22
Zucchini / squash	warm	Direct sow: February 22
Bush beans	warm	Direct sow: February 22
Sweet corn	warm	Direct sow: February 22
Basil	warm	Transplant out: February 22
Peas	cool	Sow (spring): January 11 · Sow (fall): October 7
Spinach	cool	Sow (spring): January 4 · Sow (fall): October 7
Lettuce	cool	Sow (spring): January 18 · Sow (fall): October 7
Kale	cool	Transplant (spring): January 25 · Sow (fall): September 23
Broccoli	cool	Transplant (spring): February 1
Carrots	cool	Sow (spring): January 25 · Sow (fall): September 23
Onions	cool	Transplant (spring): January 18
Potatoes	cool	Plant seed potatoes: February 1
Radishes	cool	Sow (spring): January 18 · Sow (fall): October 21

Dates are computed from Pleasanton'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 — Livermore, CA, 3.6 mi (confidence: high). Monthly weather normals: Livermore, CA, 3.6 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.