Frost dates for Miami, 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 24
typical year
Safe to plant
March 18
frost is over in 9 of 10 years
First fall frost
December 1
typical year
Growing season
279 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 27 – Feb 10 | – |
| Spinach | – | Jan 13 – Feb 3 | Oct 6 – 20 |
| Lettuce | – | Jan 27 – Feb 17 | Oct 6 – 20 |
| Radishes | – | Jan 27 – Mar 10 | Oct 20 – Nov 3 |
| Onions | – | Jan 27 – Feb 10 | – |
| Potatoes | – | Feb 3 – 17 | – |
| Carrots | – | Feb 3 – 24 | Sep 8 – 22 |
| Beets | – | Jan 27 – Feb 10 | Sep 22 – Oct 6 |
| Kale | Dec 16 – 30 | Jan 27 – Feb 10 | Sep 22 – Oct 6 |
| Broccoli | Dec 16 – 30 | Feb 10 – 24 | Sep 22 – Oct 6 |
| Cabbage | Dec 2 – 16 | Jan 27 – Feb 10 | Sep 22 – Oct 6 |
| Garlic | – | – | Oct 20 – Nov 10 |
| Warm-season crops | |||
| Tomatoes | Jan 21 – Feb 4 | Mar 18 – Apr 1 | – |
| Peppers | Jan 14 – 28 | Mar 25 – Apr 8 | – |
| Cucumbers | – | Mar 18 – Apr 8 | – |
| Zucchini | – | Mar 18 – Apr 15 | – |
| Pumpkins | – | Mar 18 – Apr 8 | – |
| Green beans | – | Mar 18 – Sep 22 | – |
| Sweet corn | – | Mar 18 – Apr 15 | – |
| Basil | Feb 11 – 25 | Mar 25 – Apr 1 | – |
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 18 | February 24 | January 30 |
| Fall frost before | November 15 | December 1 | December 15 |
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 30 (February 28 in a late year), and the first one in fall around December 13.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Miami
Where these dates come from
NOAA weather station MIAMI, AZ US (USC00025512), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 6 miles:
85532, 85539
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.