When is the last frost in Concord, CA?

The average last spring frost (50% probability of 32°F) in Concord is around January 9, based on NOAA/NCEI 1991–2020 normals at the Concord Buchanan Fld, CA station (2.3 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 Concord?

The average first fall frost in Concord, CA is around December 14, giving roughly a 343-day frost-free growing season.

What planting zone is Concord, CA?

Concord 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 Concord?

In Concord, CA the warmest month is July (avg high 88.3°F) and the coldest is December (avg low 41.2°F). It averages about 17.7″ of precipitation a year.

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Concord, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 94519 · elevation 12′ · NOAA & USDA data

Concord is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 343 days between the average last spring frost (January 9) and first fall frost (December 14). The warmest month is July (avg high 88.3°F); the coldest is December (avg low 41.2°F). It averages 17.7″ 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 9

avg (50% prob, 32°F)

First fall frost

December 14

avg (50% prob, 32°F)

Growing season

343 days

frost-free window

Warmest month

July

avg high 88.3°F

Month-by-month typical weather in Concord

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Concord Wwtp, CA (3.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	58.4	41.7	50.1	3.5
February	63.2	44.1	53.7	3.6
March	67.7	46.8	57.2	2.6
April	72.2	49.2	60.7	1.2
May	78	53.1	65.5	0.6
June	84.6	56.7	70.7	0.1
July	88.3	58.3	73.3	0
August	88.2	58.8	73.5	0
September	86.1	57.6	71.9	0.1
October	78.2	53.1	65.6	0.7
November	66.7	45.9	56.3	1.9
December	58.7	41.2	49.9	3.6

What to plant when in Concord

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: November 28 · Transplant out: January 16
Peppers	warm	Start seeds indoors: November 14 · Transplant out: January 23
Cucumbers	warm	Direct sow: January 16
Zucchini / squash	warm	Direct sow: January 16
Bush beans	warm	Direct sow: January 16
Sweet corn	warm	Direct sow: January 16
Basil	warm	Transplant out: January 16
Peas	cool	Sow (spring): December 5 · Sow (fall): October 19
Spinach	cool	Sow (spring): November 28 · Sow (fall): October 19
Lettuce	cool	Sow (spring): December 12 · Sow (fall): October 19
Kale	cool	Transplant (spring): December 19 · Sow (fall): October 5
Broccoli	cool	Transplant (spring): December 26
Carrots	cool	Sow (spring): December 19 · Sow (fall): October 5
Onions	cool	Transplant (spring): December 12
Potatoes	cool	Plant seed potatoes: December 26
Radishes	cool	Sow (spring): December 12 · Sow (fall): November 2

Dates are computed from Concord'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 — Concord Buchanan Fld, CA, 2.3 mi (confidence: high). Monthly weather normals: Concord Wwtp, CA, 3.1 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.