Frost dates for Pomona, 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 8
typical year
Safe to plant
February 18
frost is over in 9 of 10 years
First fall frost
December 28
typical year
Growing season
354 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 11 – 25 | – |
| Spinach | – | Nov 27 – Dec 18 | Nov 2 – 16 |
| Lettuce | – | Dec 11 – Jan 1 | Nov 2 – 16 |
| Radishes | – | Dec 11 – Jan 22 | Nov 16 – 30 |
| Onions | – | Dec 11 – 25 | – |
| Potatoes | – | Dec 18 – Jan 1 | – |
| Carrots | – | Dec 18 – Jan 8 | Oct 5 – 19 |
| Beets | – | Dec 11 – 25 | Oct 19 – Nov 2 |
| Kale | Oct 30 – Nov 13 | Dec 11 – 25 | Oct 19 – Nov 2 |
| Broccoli | Oct 30 – Nov 13 | Dec 25 – Jan 8 | Oct 19 – Nov 2 |
| Cabbage | Oct 16 – 30 | Dec 11 – 25 | Oct 19 – Nov 2 |
| Garlic | – | – | Nov 16 – Dec 7 |
| Warm-season crops | |||
| Tomatoes | Dec 24 – Jan 7 | Feb 18 – Mar 4 | – |
| Peppers | Dec 17 – 31 | Feb 25 – Mar 11 | – |
| Cucumbers | – | Feb 18 – Mar 11 | – |
| Zucchini | – | Feb 18 – Mar 18 | – |
| Pumpkins | – | Feb 18 – Mar 11 | – |
| Green beans | – | Feb 18 – Oct 19 | – |
| Sweet corn | – | Feb 18 – Mar 18 | – |
| Basil | Jan 14 – 28 | Feb 25 – Mar 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 | February 18 | January 8 | December 14 |
| Fall frost before | December 5 | December 28 | February 2 |
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 n/a (n/a in a late year), and the first one in fall around n/a.
Towns that use these dates
This is the nearest NOAA station with frost records for 12 towns.
Pomona, West Covina, Diamond Bar, Glendora, Covina, Azusa, Brea, Montclair, Claremont, San Dimas, La Verne, Walnut
Where these dates come from
NOAA weather station POMONA/FAIRPLEX, CA US (USC00047050), 1991–2020 climate normals. It's the nearest station for 19 zip codes, all within 15 miles:
91711, 91722, 91723, 91724, 91740, 91741, 91748, 91750, 91763, 91765, 91766, 91767, 91768, 91773, 91789, 91791, 91792, 92821, 92835
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.