La Cañada Flintridge, CA 91020 Frost Dates
Frost dates for La Cañada Flintridge, CA, ZIP 91020
Typically, the last spring freeze lands around 01/08, roughly 133 days out. The first fall frost typically arrives around 01/07, about 365 frost-free days later.
Zone 10a (30 to 35°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 La Cañada Flintridge, not a forecast for this year.
What to do before the first frost
Zone 10a around La Cañada Flintridge has about 19 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
01/08 is the middle of 30 years of NOAA records, not a promise. Plant by 02/17 and you're betting against frost in roughly 9 years out of 10. 12/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How La Cañada Flintridge compares
La Cañada Flintridge's growing season runs about 365 days, ranking 1,474 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 758 of 2,555.
Learn more
the frost range explains how to read the range around La Cañada Flintridge's dates instead of trusting one, and local microclimates explains what one yard in La Cañada Flintridge can differ from the 91020 normal.