Concord, CA 94520 Frost Dates
When can you plant in Concord, CA?
The last spring frost here typically falls around 01/09, about 134 days from today. The first fall frost typically arrives around 12/14, about 343 frost-free days later.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Concord, not a forecast for this year.
What to do before the first frost
About 15 weeks of growing season left in Concord before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
01/09 is the middle of 30 years of NOAA records, not a promise. Plant by 02/12 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Concord compares
Concord's growing season runs about 343 days, ranking 2,462 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,108 of 2,555.
Learn more
local microclimates covers what one yard in Concord can differ from the 94520 normal. zone vs. frost date covers why Zone 9b and Concord's frost date answer different questions.