National City, CA 92139 Frost Dates
Frost dates for National City, CA, ZIP 92139
The NOAA station nearest to 92139 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).
How National City compares
National City's growing season runs about 365 days, ranking 791 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 339 of 2,555.
Learn more
the methodology explains exactly which NOAA and USDA figures feed 92139's numbers, and zone vs. frost date explains why Zone 10b and National City's frost date answer different questions.