Frost dates for Mt Laguna #3, 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
April 22
typical year
Safe to plant
May 21
frost is over in 9 of 10 years
First fall frost
November 8
typical year
Growing season
197 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 | – | Mar 25 – Apr 8 | – |
| Spinach | – | Mar 11 – Apr 1 | Sep 13 – 27 |
| Lettuce | – | Mar 25 – Apr 15 | Sep 13 – 27 |
| Radishes | – | Mar 25 – May 6 | Sep 27 – Oct 11 |
| Onions | – | Mar 25 – Apr 8 | – |
| Potatoes | – | Apr 1 – 15 | – |
| Carrots | – | Apr 1 – 22 | Aug 16 – 30 |
| Beets | – | Mar 25 – Apr 8 | Aug 30 – Sep 13 |
| Kale | Feb 11 – 25 | Mar 25 – Apr 8 | Aug 30 – Sep 13 |
| Broccoli | Feb 11 – 25 | Apr 8 – 22 | Aug 30 – Sep 13 |
| Cabbage | Jan 28 – Feb 11 | Mar 25 – Apr 8 | Aug 30 – Sep 13 |
| Garlic | – | – | Sep 27 – Oct 18 |
| Warm-season crops | |||
| Tomatoes | Mar 26 – Apr 9 | May 21 – Jun 4 | – |
| Peppers | Mar 19 – Apr 2 | May 28 – Jun 11 | – |
| Cucumbers | – | May 21 – Jun 11 | – |
| Zucchini | – | May 21 – Jun 18 | – |
| Pumpkins | – | May 21 – Jun 11 | – |
| Green beans | – | May 21 – Aug 30 | – |
| Sweet corn | – | May 21 – Jun 18 | – |
| Basil | Apr 16 – 30 | May 28 – Jun 4 | – |
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 | May 21 | April 22 | March 25 |
| Fall frost before | October 10 | November 8 | December 4 |
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 April 2 (May 8 in a late year), and the first one in fall around December 1.
Where these dates come from
NOAA weather station MT LAGUNA #3, CA US (USC00045968), 1991–2020 climate normals. It's the nearest station for 3 zip codes, all within 10 miles:
91931, 91948, 91962
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.