Frost dates for Mullan Pass Vor/Dme, ID
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
June 10
typical year
Safe to plant
June 25
frost is over in 9 of 10 years
First fall frost
September 23
typical year
Growing season
104 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 | – | May 13 – 27 | – |
| Spinach | – | Apr 29 – May 20 | Jul 29 – Aug 12 |
| Lettuce | – | May 13 – Jun 3 | Jul 29 – Aug 12 |
| Radishes | – | May 13 – Jun 24 | Aug 12 – 26 |
| Onions | – | May 13 – 27 | – |
| Potatoes | – | May 20 – Jun 3 | – |
| Carrots | – | May 20 – Jun 10 | Jul 1 – 15 |
| Beets | – | May 13 – 27 | Jul 15 – 29 |
| Kale | Apr 1 – 15 | May 13 – 27 | Jul 15 – 29 |
| Broccoli | Apr 1 – 15 | May 27 – Jun 10 | Jul 15 – 29 |
| Cabbage | Mar 18 – Apr 1 | May 13 – 27 | Jul 15 – 29 |
| Garlic | – | – | Aug 12 – Sep 2 |
| Warm-season crops | |||
| Tomatoes | Apr 30 – May 14 | Jun 25 – Jul 9 | – |
| Peppers | Apr 23 – May 7 | Jul 2 – 16 | – |
| Cucumbers | – | Jun 25 – Jul 16 | – |
| Zucchini | – | Jun 25 – Jul 23 | – |
| Pumpkins | Season usually too short. Try a quick variety or row covers. | ||
| Green beans | – | Jun 25 – Jul 15 | – |
| Sweet corn | – | Jun 25 – Jul 23 | – |
| Basil | May 21 – Jun 4 | Jul 2 – 9 | – |
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 | June 25 | June 10 | May 21 |
| Fall frost before | September 4 | September 23 | October 8 |
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 May 21 (June 12 in a late year), and the first one in fall around October 5.
Where these dates come from
NOAA weather station MULLAN PASS VOR/DME, ID US (USW00024154), 1991–2020 climate normals. It's the nearest station for 4 zip codes, all within 13 miles:
59830, 59842, 59867, 83802
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.