Frost dates for Nogales, 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
March 20
typical year
Safe to plant
April 13
frost is over in 9 of 10 years
First fall frost
November 17
typical year
Growing season
239 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 20 – Mar 6 | – |
| Spinach | – | Feb 6 – 27 | Sep 22 – Oct 6 |
| Lettuce | – | Feb 20 – Mar 13 | Sep 22 – Oct 6 |
| Radishes | – | Feb 20 – Apr 3 | Oct 6 – 20 |
| Onions | – | Feb 20 – Mar 6 | – |
| Potatoes | – | Feb 27 – Mar 13 | – |
| Carrots | – | Feb 27 – Mar 20 | Aug 25 – Sep 8 |
| Beets | – | Feb 20 – Mar 6 | Sep 8 – 22 |
| Kale | Jan 9 – 23 | Feb 20 – Mar 6 | Sep 8 – 22 |
| Broccoli | Jan 9 – 23 | Mar 6 – 20 | Sep 8 – 22 |
| Cabbage | Dec 26 – Jan 9 | Feb 20 – Mar 6 | Sep 8 – 22 |
| Garlic | – | – | Oct 6 – 27 |
| Warm-season crops | |||
| Tomatoes | Feb 16 – Mar 2 | Apr 13 – 27 | – |
| Peppers | Feb 9 – 23 | Apr 20 – May 4 | – |
| Cucumbers | – | Apr 13 – May 4 | – |
| Zucchini | – | Apr 13 – May 11 | – |
| Pumpkins | – | Apr 13 – May 4 | – |
| Green beans | – | Apr 13 – Sep 8 | – |
| Sweet corn | – | Apr 13 – May 11 | – |
| Basil | Mar 9 – 23 | Apr 20 – 27 | – |
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 13 | March 20 | February 24 |
| Fall frost before | October 30 | November 17 | December 3 |
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 23 (March 21 in a late year), and the first one in fall around November 30.
Towns that use these dates
This is the nearest NOAA station with frost records for 2 towns.
Nogales, Patagonia
Where these dates come from
NOAA weather station NOGALES INTL AP, AZ US (USW00003196), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 10 miles:
85621, 85624
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.