Concord, CA 94518 Frost Dates
94518, near Concord, CA: the frost window
The last spring frost here typically falls around 01/09, about 134 days from today. Fall's first freeze usually shows up around 12/14, roughly 343 days after the last spring frost.
Concord sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Concord's growing season runs out in roughly 15 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/09 isn't a guarantee
01/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/16 and only about 1 year in 10 sees frost after that.
Concord against the rest of the dataset
About 343 days separate Concord's last and first frost, putting it 2,460 of 40,283 ZIP codes nationally. Within CA, it ranks 1,106 of 2,555.
Learn more
Two guides worth reading on 94518: zone vs. frost date, on why Zone 9b and Concord's frost date answer different questions, and the frost range, on how to read the range around Concord's dates instead of trusting one.