Frost dates for Seligman, 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
May 10
typical year
Safe to plant
May 29
frost is over in 9 of 10 years
First fall frost
October 15
typical year
Growing season
154 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 | – | Apr 12 – 26 | – |
| Spinach | – | Mar 29 – Apr 19 | Aug 20 – Sep 3 |
| Lettuce | – | Apr 12 – May 3 | Aug 20 – Sep 3 |
| Radishes | – | Apr 12 – May 24 | Sep 3 – 17 |
| Onions | – | Apr 12 – 26 | – |
| Potatoes | – | Apr 19 – May 3 | – |
| Carrots | – | Apr 19 – May 10 | Jul 23 – Aug 6 |
| Beets | – | Apr 12 – 26 | Aug 6 – 20 |
| Kale | Mar 1 – 15 | Apr 12 – 26 | Aug 6 – 20 |
| Broccoli | Mar 1 – 15 | Apr 26 – May 10 | Aug 6 – 20 |
| Cabbage | Feb 15 – Mar 1 | Apr 12 – 26 | Aug 6 – 20 |
| Garlic | – | – | Sep 3 – 24 |
| Warm-season crops | |||
| Tomatoes | Apr 3 – 17 | May 29 – Jun 12 | – |
| Peppers | Mar 27 – Apr 10 | Jun 5 – 19 | – |
| Cucumbers | – | May 29 – Jun 19 | – |
| Zucchini | – | May 29 – Jun 26 | – |
| Pumpkins | – | May 29 – Jun 19 | – |
| Green beans | – | May 29 – Aug 6 | – |
| Sweet corn | – | May 29 – Jun 26 | – |
| Basil | Apr 24 – May 8 | Jun 5 – 12 | – |
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 29 | May 10 | April 26 |
| Fall frost before | October 1 | October 15 | October 30 |
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 April 24 (May 13 in a late year), and the first one in fall around October 26.
Where these dates come from
NOAA weather station SELIGMAN, AZ US (USC00027716), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 15 miles:
86320, 86337
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.