Frost dates for Ukiah, 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 19
typical year
Safe to plant
April 15
frost is over in 9 of 10 years
First fall frost
November 20
typical year
Growing season
245 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 19 – Mar 5 | – |
| Spinach | – | Feb 5 – 26 | Sep 25 – Oct 9 |
| Lettuce | – | Feb 19 – Mar 12 | Sep 25 – Oct 9 |
| Radishes | – | Feb 19 – Apr 2 | Oct 9 – 23 |
| Onions | – | Feb 19 – Mar 5 | – |
| Potatoes | – | Feb 26 – Mar 12 | – |
| Carrots | – | Feb 26 – Mar 19 | Aug 28 – Sep 11 |
| Beets | – | Feb 19 – Mar 5 | Sep 11 – 25 |
| Kale | Jan 8 – 22 | Feb 19 – Mar 5 | Sep 11 – 25 |
| Broccoli | Jan 8 – 22 | Mar 5 – 19 | Sep 11 – 25 |
| Cabbage | Dec 25 – Jan 8 | Feb 19 – Mar 5 | Sep 11 – 25 |
| Garlic | – | – | Oct 9 – 30 |
| Warm-season crops | |||
| Tomatoes | Feb 18 – Mar 4 | Apr 15 – 29 | – |
| Peppers | Feb 11 – 25 | Apr 22 – May 6 | – |
| Cucumbers | – | Apr 15 – May 6 | – |
| Zucchini | – | Apr 15 – May 13 | – |
| Pumpkins | – | Apr 15 – May 6 | – |
| Green beans | – | Apr 15 – Sep 11 | – |
| Sweet corn | – | Apr 15 – May 13 | – |
| Basil | Mar 11 – 25 | Apr 22 – 29 | – |
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 | April 15 | March 19 | February 13 |
| Fall frost before | November 2 | November 20 | December 9 |
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 February 6 (March 13 in a late year), and the first one in fall around December 5.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Ukiah
Where these dates come from
NOAA weather station UKIAH, CA US (USC00049122), 1991–2020 climate normals. It's the nearest station for 3 zip codes, all within 23 miles:
95432, 95463, 95482
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.