South Pasadena, CA 90041 Frost Dates
90041, near South Pasadena, CA: the frost window
Around 01/08 is the usual last spring frost, about 133 days away. Fall's first freeze usually shows up around 01/07, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts South Pasadena in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
South Pasadena's growing season runs out in roughly 19 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/08 isn't a guarantee
01/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/20 and only about 1 year in 10 sees frost after that.
South Pasadena against the rest of the dataset
At roughly 365 frost-free days, South Pasadena places 1,161 of 40,283 ZIP codes in this dataset. Within CA, it ranks 494 of 2,555.
Learn more
Two guides worth reading on 90041: the frost range, on how to read the range around South Pasadena's dates instead of trusting one, and local microclimates, on what one yard in South Pasadena can differ from the 90041 normal.