Concord, CA 94519 Frost Dates
When can you plant in Concord, CA?
Around 01/09 is the usual last spring frost, about 134 days away. The first fall frost typically arrives around 12/14, about 343 frost-free days later.
The USDA Plant Hardiness Zone Map puts Concord in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
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.
Why 01/09 isn't a guarantee
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
About 343 days separate Concord's last and first frost, putting it 2,461 of 40,283 ZIP codes nationally. Within CA, it ranks 1,107 of 2,555.
Learn more
the frost range covers how to read the range around Concord's dates instead of trusting one. local microclimates covers what one yard in Concord can differ from the 94519 normal.