Frost dates for Chiriaco Summit, 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
February 5
typical year
Safe to plant
March 5
frost is over in 9 of 10 years
First fall frost
December 17
typical year
Growing season
313 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 | – | Jan 8 – 22 | – |
| Spinach | – | Dec 25 – Jan 15 | Oct 22 – Nov 5 |
| Lettuce | – | Jan 8 – 29 | Oct 22 – Nov 5 |
| Radishes | – | Jan 8 – Feb 19 | Nov 5 – 19 |
| Onions | – | Jan 8 – 22 | – |
| Potatoes | – | Jan 15 – 29 | – |
| Carrots | – | Jan 15 – Feb 5 | Sep 24 – Oct 8 |
| Beets | – | Jan 8 – 22 | Oct 8 – 22 |
| Kale | Nov 27 – Dec 11 | Jan 8 – 22 | Oct 8 – 22 |
| Broccoli | Nov 27 – Dec 11 | Jan 22 – Feb 5 | Oct 8 – 22 |
| Cabbage | Nov 13 – 27 | Jan 8 – 22 | Oct 8 – 22 |
| Garlic | – | – | Nov 5 – 26 |
| Warm-season crops | |||
| Tomatoes | Jan 8 – 22 | Mar 5 – 19 | – |
| Peppers | Jan 1 – 15 | Mar 12 – 26 | – |
| Cucumbers | – | Mar 5 – 26 | – |
| Zucchini | – | Mar 5 – Apr 2 | – |
| Pumpkins | – | Mar 5 – 26 | – |
| Green beans | – | Mar 5 – Oct 8 | – |
| Sweet corn | – | Mar 5 – Apr 2 | – |
| Basil | Jan 29 – Feb 12 | Mar 12 – 19 | – |
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 | March 5 | February 5 | December 30 |
| Fall frost before | November 25 | December 17 | January 10 |
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 10 (February 20 in a late year), and the first one in fall around December 31.
Where these dates come from
NOAA weather station CHIRIACO SUMMIT, CA US (USC00041738), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 25 miles:
92257
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.