When is the last frost in Vacaville, CA?

The average last spring frost (50% probability of 32°F) in Vacaville is around February 18, based on NOAA/NCEI 1991–2020 normals at the Vacaville Nut Tree Ap, CA station (3.7 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 Vacaville?

The average first fall frost in Vacaville, CA is around November 28, giving roughly a 283-day frost-free growing season.

What planting zone is Vacaville, CA?

Vacaville 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 Vacaville?

In Vacaville, CA the warmest month is July (avg high 97.3°F) and the coldest is December (avg low 39.5°F). It averages about 25.6″ of precipitation a year.

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Vacaville, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 95687 · elevation 34′ · NOAA & USDA data

Vacaville is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 283 days between the average last spring frost (February 18) and first fall frost (November 28). The warmest month is July (avg high 97.3°F); the coldest is December (avg low 39.5°F). It averages 25.6″ 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 18

avg (50% prob, 32°F)

First fall frost

November 28

avg (50% prob, 32°F)

Growing season

283 days

frost-free window

Warmest month

July

avg high 97.3°F

Month-by-month typical weather in Vacaville

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Vacaville, CA (4.8 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	57.6	39.6	48.6	5.6
February	63	42.2	52.6	5.1
March	68.5	44.8	56.6	3.4
April	74.9	48	61.5	1.2
May	82.8	52.9	67.8	0.8
June	90.7	57.7	74.2	0.2
July	97.3	60.2	78.7	0
August	96.5	59.5	78	0.1
September	91.9	57.5	74.7	0.1
October	81.2	51.8	66.5	1
November	67	44.5	55.8	2.4
December	57.9	39.5	48.7	5.7

What to plant when in Vacaville

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 7 · Transplant out: February 25
Peppers	warm	Start seeds indoors: December 24 · Transplant out: March 4
Cucumbers	warm	Direct sow: February 25
Zucchini / squash	warm	Direct sow: February 25
Bush beans	warm	Direct sow: February 25
Sweet corn	warm	Direct sow: February 25
Basil	warm	Transplant out: February 25
Peas	cool	Sow (spring): January 14 · Sow (fall): October 3
Spinach	cool	Sow (spring): January 7 · Sow (fall): October 3
Lettuce	cool	Sow (spring): January 21 · Sow (fall): October 3
Kale	cool	Transplant (spring): January 28 · Sow (fall): September 19
Broccoli	cool	Transplant (spring): February 4
Carrots	cool	Sow (spring): January 28 · Sow (fall): September 19
Onions	cool	Transplant (spring): January 21
Potatoes	cool	Plant seed potatoes: February 4
Radishes	cool	Sow (spring): January 21 · Sow (fall): October 17

Dates are computed from Vacaville'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 — Vacaville Nut Tree Ap, CA, 3.7 mi (confidence: high). Monthly weather normals: Vacaville, CA, 4.8 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.