Frost dates for San Rafael, 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 11
typical year
Safe to plant
February 25
frost is over in 9 of 10 years
First fall frost
December 21
typical year
Growing season
349 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 14 – 28 | – |
| Spinach | – | Nov 30 – Dec 21 | Oct 26 – Nov 9 |
| Lettuce | – | Dec 14 – Jan 4 | Oct 26 – Nov 9 |
| Radishes | – | Dec 14 – Jan 25 | Nov 9 – 23 |
| Onions | – | Dec 14 – 28 | – |
| Potatoes | – | Dec 21 – Jan 4 | – |
| Carrots | – | Dec 21 – Jan 11 | Sep 28 – Oct 12 |
| Beets | – | Dec 14 – 28 | Oct 12 – 26 |
| Kale | Nov 2 – 16 | Dec 14 – 28 | Oct 12 – 26 |
| Broccoli | Nov 2 – 16 | Dec 28 – Jan 11 | Oct 12 – 26 |
| Cabbage | Oct 19 – Nov 2 | Dec 14 – 28 | Oct 12 – 26 |
| Garlic | – | – | Nov 9 – 30 |
| Warm-season crops | |||
| Tomatoes | Dec 31 – Jan 14 | Feb 25 – Mar 11 | – |
| Peppers | Dec 24 – Jan 7 | Mar 4 – 18 | – |
| Cucumbers | – | Feb 25 – Mar 18 | – |
| Zucchini | – | Feb 25 – Mar 25 | – |
| Pumpkins | – | Feb 25 – Mar 18 | – |
| Green beans | – | Feb 25 – Oct 12 | – |
| Sweet corn | – | Feb 25 – Mar 25 | – |
| Basil | Jan 21 – Feb 4 | Mar 4 – 11 | – |
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 25 | January 11 | December 14 |
| Fall frost before | December 2 | December 21 | February 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 December 31 (February 21 in a late year), and the first one in fall around December 29.
Towns that use these dates
This is the nearest NOAA station with frost records for 4 towns.
San Rafael, Novato, San Anselmo, Fairfax
Where these dates come from
NOAA weather station SAN RAFAEL CIVIC CTR, CA US (USC00047880), 1991–2020 climate normals. It's the nearest station for 13 zip codes, all within 15 miles:
94901, 94903, 94933, 94938, 94945, 94946, 94947, 94949, 94950, 94956, 94960, 94963, 94973
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.