When to plant in San Jose, CA
Planting dates worked out from San Jose's own frost records, not a generic zone chart.
Frost is rare in San Jose: in 9 of the last 22 springs there was none at all. Frost dates matter less here than heat, so the planting table below is left out.
Safe to plant out
Feb 16
1 year in 10 has a later frost
Average last frost
Jan 16
about a 50% chance of a later one
Average first fall frost
Dec 21
1 year in 10 by Dec 3
Frost-free days
337
median, 1991–2020
Station used: San Jose · 3.4 km away · station 15 m, town 26 m. How we match towns to stations
San Jose's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's last spring frostLong-term trend
See the data as a table
| Year | Last spring frost |
|---|---|
| 1999 | Feb 11 |
| 2001 | Jan 17 |
| 2002 | Jan 31 |
| 2004 | Jan 4 |
| 2006 | Feb 16 |
| 2007 | Jan 18 |
| 2009 | Jan 4 |
| 2011 | Feb 27 |
| 2012 | Jan 18 |
| 2013 | Feb 9 |
| 2015 | Jan 3 |
| 2017 | Jan 6 |
| 2018 | Feb 24 |
| 2021 | Jan 26 |
| 2022 | Jan 2 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1999 | 322 |
| 2000 | 363 |
| 2001 | 347 |
| 2002 | 333 |
| 2003 | 363 |
| 2004 | 332 |
| 2005 | 363 |
| 2006 | 304 |
| 2007 | 337 |
| 2008 | 350 |
| 2009 | 337 |
| 2010 | 328 |
| 2011 | 298 |
| 2013 | 298 |
| 2014 | 363 |
| 2015 | 328 |
| 2016 | 350 |
| 2017 | 358 |
| 2018 | 309 |
| 2019 | 363 |
| 2020 | 363 |
| 2021 | 326 |
| 2022 | 362 |
| 2023 | 363 |
| 2024 | 363 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1999 | 17.5 °C |
| 2000 | 18.9 °C |
| 2001 | 18.7 °C |
| 2002 | 18.8 °C |
| 2003 | 18.8 °C |
| 2004 | 19.3 °C |
| 2005 | 18.5 °C |
| 2006 | 19.1 °C |
| 2007 | 18.9 °C |
| 2008 | 19.1 °C |
| 2009 | 19.3 °C |
| 2010 | 18.2 °C |
| 2011 | 18.4 °C |
| 2012 | 18.6 °C |
| 2013 | 19.2 °C |
| 2014 | 19.5 °C |
| 2015 | 19.2 °C |
| 2016 | 19.7 °C |
| 2017 | 20.2 °C |
| 2018 | 19.3 °C |
| 2019 | 19.6 °C |
| 2020 | 20.4 °C |
| 2021 | 19.1 °C |
| 2022 | 20.0 °C |
| 2023 | 19.1 °C |
| 2024 | 20.7 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from San Jose (NOAA GHCN-Daily). Years with too many missing days are left out.