Frost dates for Natural Brg, 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
April 9
typical year
Safe to plant
May 10
frost is over in 9 of 10 years
First fall frost
November 10
typical year
Growing season
211 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 | – | Mar 12 – 26 | – |
| Spinach | – | Feb 26 – Mar 19 | Sep 15 – 29 |
| Lettuce | – | Mar 12 – Apr 2 | Sep 15 – 29 |
| Radishes | – | Mar 12 – Apr 23 | Sep 29 – Oct 13 |
| Onions | – | Mar 12 – 26 | – |
| Potatoes | – | Mar 19 – Apr 2 | – |
| Carrots | – | Mar 19 – Apr 9 | Aug 18 – Sep 1 |
| Beets | – | Mar 12 – 26 | Sep 1 – 15 |
| Kale | Jan 29 – Feb 12 | Mar 12 – 26 | Sep 1 – 15 |
| Broccoli | Jan 29 – Feb 12 | Mar 26 – Apr 9 | Sep 1 – 15 |
| Cabbage | Jan 15 – 29 | Mar 12 – 26 | Sep 1 – 15 |
| Garlic | – | – | Sep 29 – Oct 20 |
| Warm-season crops | |||
| Tomatoes | Mar 15 – 29 | May 10 – 24 | – |
| Peppers | Mar 8 – 22 | May 17 – 31 | – |
| Cucumbers | – | May 10 – 31 | – |
| Zucchini | – | May 10 – Jun 7 | – |
| Pumpkins | – | May 10 – 31 | – |
| Green beans | – | May 10 – Sep 1 | – |
| Sweet corn | – | May 10 – Jun 7 | – |
| Basil | Apr 5 – 19 | May 17 – 24 | – |
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 | May 10 | April 9 | March 17 |
| Fall frost before | October 21 | November 10 | November 24 |
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 March 16 (April 14 in a late year), and the first one in fall around November 20.
Where these dates come from
NOAA weather station NATURAL BRG, AZ US (USC00025825), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 4 miles:
85544
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.