Frost dates for Fountain Hills, 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
January 6
typical year
Safe to plant
February 11
frost is over in 9 of 10 years
First fall frost
December 28
typical year
Growing season
356 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 9 – 23 | – |
| Spinach | – | Nov 25 – Dec 16 | Nov 2 – 16 |
| Lettuce | – | Dec 9 – 30 | Nov 2 – 16 |
| Radishes | – | Dec 9 – Jan 20 | Nov 16 – 30 |
| Onions | – | Dec 9 – 23 | – |
| Potatoes | – | Dec 16 – 30 | – |
| Carrots | – | Dec 16 – Jan 6 | Oct 5 – 19 |
| Beets | – | Dec 9 – 23 | Oct 19 – Nov 2 |
| Kale | Oct 28 – Nov 11 | Dec 9 – 23 | Oct 19 – Nov 2 |
| Broccoli | Oct 28 – Nov 11 | Dec 23 – Jan 6 | Oct 19 – Nov 2 |
| Cabbage | Oct 14 – 28 | Dec 9 – 23 | Oct 19 – Nov 2 |
| Garlic | – | – | Nov 16 – Dec 7 |
| Warm-season crops | |||
| Tomatoes | Dec 17 – 31 | Feb 11 – 25 | – |
| Peppers | Dec 10 – 24 | Feb 18 – Mar 4 | – |
| Cucumbers | – | Feb 11 – Mar 4 | – |
| Zucchini | – | Feb 11 – Mar 11 | – |
| Pumpkins | – | Feb 11 – Mar 4 | – |
| Green beans | – | Feb 11 – Oct 19 | – |
| Sweet corn | – | Feb 11 – Mar 11 | – |
| Basil | Jan 7 – 21 | Feb 18 – 25 | – |
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 11 | January 6 | December 14 |
| Fall frost before | December 4 | December 28 | January 27 |
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 9 (January 31 in a late year), and the first one in fall around January 8.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Fountain Hills
Where these dates come from
NOAA weather station FOUNTAIN HILLS, AZ US (USC00023190), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 6 miles:
85259, 85268
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.