Frost dates for San Gregorio, CA
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
March 2
typical year
Safe to plant
April 15
frost is over in 9 of 10 years
First fall frost
November 25
typical year
Growing season
268 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Feb 2 – 16 | – |
| Spinach | – | Jan 19 – Feb 9 | Sep 30 – Oct 14 |
| Lettuce | – | Feb 2 – 23 | Sep 30 – Oct 14 |
| Radishes | – | Feb 2 – Mar 16 | Oct 14 – 28 |
| Onions | – | Feb 2 – 16 | – |
| Potatoes | – | Feb 9 – 23 | – |
| Carrots | – | Feb 9 – Mar 2 | Sep 2 – 16 |
| Beets | – | Feb 2 – 16 | Sep 16 – 30 |
| Kale | Dec 22 – Jan 5 | Feb 2 – 16 | Sep 16 – 30 |
| Broccoli | Dec 22 – Jan 5 | Feb 16 – Mar 2 | Sep 16 – 30 |
| Cabbage | Dec 8 – 22 | Feb 2 – 16 | Sep 16 – 30 |
| Garlic | – | – | Oct 14 – Nov 4 |
| Warm-season crops | |||
| Tomatoes | Feb 18 – Mar 4 | Apr 15 – 29 | – |
| Peppers | Feb 11 – 25 | Apr 22 – May 6 | – |
| Cucumbers | – | Apr 15 – May 6 | – |
| Zucchini | – | Apr 15 – May 13 | – |
| Pumpkins | – | Apr 15 – May 6 | – |
| Green beans | – | Apr 15 – Sep 16 | – |
| Sweet corn | – | Apr 15 – May 13 | – |
| Basil | Mar 11 – 25 | Apr 22 – 29 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | April 15 | March 2 | December 31 |
| Fall frost before | November 1 | November 25 | January 1 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around January 2 (February 19 in a late year), and the first one in fall around December 12.
Where these dates come from
NOAA weather station SAN GREGORIO 2 SE, CA US (USC00047807), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 2 miles:
94074
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.