Frost dates for San Jose
The typical last spring frost in San Jose is Jan 12, and the typical first fall frost is Dec 22. These dates come from San Jose International Airport, and the growing season between them is 347 days.
NCEI U.S. Climate Normals 1991-2020, annual/seasonal (c20230404), USW00023293
This season's measured frost
No freeze has been recorded yet this fall at San Jose International Airport; the lowest reading since July 1 is 47F on Oct 11, against a typical first frost date of Dec 22.
No freeze was recorded at San Jose International Airport in the first half of 2026.
Readings come from official daily lows in the daily climate report of the National Weather Service, via the Iowa Environmental Mesonet.
Early, typical and late years for San Jose
| Year type | Last spring frost | First fall frost |
|---|---|---|
| Early year (1 in 10) | Dec 20 | Dec 1 |
| Typical year | Jan 12 | Dec 22 |
| Late year (1 in 10) | Feb 14 | Jan 20 |
For spring, an early year means 1 year in 10 has a last freeze before the early date, and a late year means 1 year in 10 has a last freeze after the late date. For fall, an early year means 1 year in 10 has a first freeze by the early date, and a late year means it holds off past the late date.
The growing season in a typical year is 347 days, with the shortest at 313 days and the longest at 365 days in 1 year in 10.
Frost and freeze thresholds
| Last spring frost | First fall frost | |
|---|---|---|
| Light frost (36F) | Feb 12 | Dec 3 |
| Freeze (32F) | Jan 12 | Dec 22 |
| Hard freeze (28F) | Dec 31 | Dec 28 |
Clear, calm nights can see frost on plants at a low of 36F. A low of 32F is a freeze, and most tender plants are killed at 28F, a hard freeze.
More weather for San Jose
A typical date is the median: half of years have an earlier last spring frost, half a later one. An early year means 1 year in 10, and a late year means 1 year in 10. Dates come from the U.S. Climate Normals for 1991-2020, published by NOAA's National Centers for Environmental Information, using a daily low of 32F or below as a freeze.
The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.