Downey, CA 90242 Frost Dates
Downey, CA: when does the frost end?
The NOAA station nearest to 90242 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 10b (35 to 40°F average annual minimum).
Downey against the rest of the dataset
Downey's growing season runs about 365 days, ranking 470 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 193 of 2,555.
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Before leaning on 90242's figures: local microclimates explains what one yard in Downey can differ from the 90242 normal, while the methodology explains exactly which NOAA and USDA figures feed 90242's numbers.