Pasadena, CA 91106 Frost Dates
Frost dates for Pasadena, CA, ZIP 91106
The last spring frost here typically falls around 01/08, about 133 days from today. The first fall frost typically arrives around 01/07, about 365 frost-free days later.
Pasadena sits in USDA Zone 10a (30 to 35°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.
What to do before the first frost
Zone 10a around Pasadena 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.
Why 01/08 isn't a guarantee
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 Pasadena compares
Pasadena's growing season runs about 365 days, ranking 422 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 165 of 2,555.
Learn more
the frost range explains how to read the range around Pasadena's dates instead of trusting one, and local microclimates explains what one yard in Pasadena can differ from the 91106 normal.