Frost dates for San Manuel, AZ
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
February 4
typical year
Safe to plant
March 2
frost is over in 9 of 10 years
First fall frost
December 8
typical year
Growing season
306 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 | – | Jan 7 – 21 | – |
| Spinach | – | Dec 24 – Jan 14 | Oct 13 – 27 |
| Lettuce | – | Jan 7 – 28 | Oct 13 – 27 |
| Radishes | – | Jan 7 – Feb 18 | Oct 27 – Nov 10 |
| Onions | – | Jan 7 – 21 | – |
| Potatoes | – | Jan 14 – 28 | – |
| Carrots | – | Jan 14 – Feb 4 | Sep 15 – 29 |
| Beets | – | Jan 7 – 21 | Sep 29 – Oct 13 |
| Kale | Nov 26 – Dec 10 | Jan 7 – 21 | Sep 29 – Oct 13 |
| Broccoli | Nov 26 – Dec 10 | Jan 21 – Feb 4 | Sep 29 – Oct 13 |
| Cabbage | Nov 12 – 26 | Jan 7 – 21 | Sep 29 – Oct 13 |
| Garlic | – | – | Oct 27 – Nov 17 |
| Warm-season crops | |||
| Tomatoes | Jan 5 – 19 | Mar 2 – 16 | – |
| Peppers | Dec 29 – Jan 12 | Mar 9 – 23 | – |
| Cucumbers | – | Mar 2 – 23 | – |
| Zucchini | – | Mar 2 – 30 | – |
| Pumpkins | – | Mar 2 – 23 | – |
| Green beans | – | Mar 2 – Sep 29 | – |
| Sweet corn | – | Mar 2 – 30 | – |
| Basil | Jan 26 – Feb 9 | Mar 9 – 16 | – |
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 2 | February 4 | January 5 |
| Fall frost before | November 20 | December 8 | December 28 |
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 10 (February 11 in a late year), and the first one in fall around December 22.
Where these dates come from
NOAA weather station SAN MANUEL, AZ US (USC00027530), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 4 miles:
85631
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.