Frost dates for San Bernardino, 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
January 27
typical year
Safe to plant
February 28
frost is over in 9 of 10 years
First fall frost
December 19
typical year
Growing season
329 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 | – | Dec 30 – Jan 13 | – |
| Spinach | – | Dec 16 – Jan 6 | Oct 24 – Nov 7 |
| Lettuce | – | Dec 30 – Jan 20 | Oct 24 – Nov 7 |
| Radishes | – | Dec 30 – Feb 10 | Nov 7 – 21 |
| Onions | – | Dec 30 – Jan 13 | – |
| Potatoes | – | Jan 6 – 20 | – |
| Carrots | – | Jan 6 – 27 | Sep 26 – Oct 10 |
| Beets | – | Dec 30 – Jan 13 | Oct 10 – 24 |
| Kale | Nov 18 – Dec 2 | Dec 30 – Jan 13 | Oct 10 – 24 |
| Broccoli | Nov 18 – Dec 2 | Jan 13 – 27 | Oct 10 – 24 |
| Cabbage | Nov 4 – 18 | Dec 30 – Jan 13 | Oct 10 – 24 |
| Garlic | – | – | Nov 7 – 28 |
| Warm-season crops | |||
| Tomatoes | Jan 3 – 17 | Feb 28 – Mar 14 | – |
| Peppers | Dec 27 – Jan 10 | Mar 7 – 21 | – |
| Cucumbers | – | Feb 28 – Mar 21 | – |
| Zucchini | – | Feb 28 – Mar 28 | – |
| Pumpkins | – | Feb 28 – Mar 21 | – |
| Green beans | – | Feb 28 – Oct 10 | – |
| Sweet corn | – | Feb 28 – Mar 28 | – |
| Basil | Jan 24 – Feb 7 | Mar 7 – 14 | – |
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 | February 28 | January 27 | December 21 |
| Fall frost before | December 1 | December 19 | January 26 |
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 7 (February 15 in a late year), and the first one in fall around January 1.
Towns that use these dates
This is the nearest NOAA station with frost records for 7 towns.
San Bernardino, Moreno Valley, Redlands, Highland, Yucaipa, Loma Linda, Calimesa
Where these dates come from
NOAA weather station REDLANDS, CA US (USC00047306), 1991–2020 climate normals. It's the nearest station for 17 zip codes, all within 11 miles:
92320, 92324, 92346, 92350, 92354, 92359, 92369, 92373, 92374, 92399, 92401, 92408, 92410, 92411, 92415, 92555, 92557
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.