Frost dates for Johnson Valley, 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 1
typical year
Safe to plant
March 29
frost is over in 9 of 10 years
First fall frost
November 29
typical year
Growing season
271 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 1 – 15 | – |
| Spinach | – | Jan 18 – Feb 8 | Oct 4 – 18 |
| Lettuce | – | Feb 1 – 22 | Oct 4 – 18 |
| Radishes | – | Feb 1 – Mar 15 | Oct 18 – Nov 1 |
| Onions | – | Feb 1 – 15 | – |
| Potatoes | – | Feb 8 – 22 | – |
| Carrots | – | Feb 8 – Mar 1 | Sep 6 – 20 |
| Beets | – | Feb 1 – 15 | Sep 20 – Oct 4 |
| Kale | Dec 21 – Jan 4 | Feb 1 – 15 | Sep 20 – Oct 4 |
| Broccoli | Dec 21 – Jan 4 | Feb 15 – Mar 1 | Sep 20 – Oct 4 |
| Cabbage | Dec 7 – 21 | Feb 1 – 15 | Sep 20 – Oct 4 |
| Garlic | – | – | Oct 18 – Nov 8 |
| Warm-season crops | |||
| Tomatoes | Feb 1 – 15 | Mar 29 – Apr 12 | – |
| Peppers | Jan 25 – Feb 8 | Apr 5 – 19 | – |
| Cucumbers | – | Mar 29 – Apr 19 | – |
| Zucchini | – | Mar 29 – Apr 26 | – |
| Pumpkins | – | Mar 29 – Apr 19 | – |
| Green beans | – | Mar 29 – Sep 20 | – |
| Sweet corn | – | Mar 29 – Apr 26 | – |
| Basil | Feb 22 – Mar 8 | Apr 5 – 12 | – |
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 29 | March 1 | January 24 |
| Fall frost before | November 11 | November 29 | December 14 |
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 30 (February 28 in a late year), and the first one in fall around December 10.
Where these dates come from
NOAA weather station JOHNSON VALLEY, CA US (USC00044394), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 2 miles:
92285
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.