Frost dates for Mullan, 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
May 12
typical year
Safe to plant
June 19
frost is over in 9 of 10 years
First fall frost
September 30
typical year
Growing season
138 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 14 – 28 | – |
| Spinach | – | Mar 31 – Apr 21 | Aug 5 – 19 |
| Lettuce | – | Apr 14 – May 5 | Aug 5 – 19 |
| Radishes | – | Apr 14 – May 26 | Aug 19 – Sep 2 |
| Onions | – | Apr 14 – 28 | – |
| Potatoes | – | Apr 21 – May 5 | – |
| Carrots | – | Apr 21 – May 12 | Jul 8 – 22 |
| Beets | – | Apr 14 – 28 | Jul 22 – Aug 5 |
| Kale | Mar 3 – 17 | Apr 14 – 28 | Jul 22 – Aug 5 |
| Broccoli | Mar 3 – 17 | Apr 28 – May 12 | Jul 22 – Aug 5 |
| Cabbage | Feb 17 – Mar 3 | Apr 14 – 28 | Jul 22 – Aug 5 |
| Garlic | – | – | Aug 19 – Sep 9 |
| Warm-season crops | |||
| Tomatoes | Apr 24 – May 8 | Jun 19 – Jul 3 | – |
| Peppers | Apr 17 – May 1 | Jun 26 – Jul 10 | – |
| Cucumbers | – | Jun 19 – Jul 10 | – |
| Zucchini | – | Jun 19 – Jul 17 | – |
| Pumpkins | – | Jun 19 – Jul 10 | – |
| Green beans | – | Jun 19 – Jul 22 | – |
| Sweet corn | – | Jun 19 – Jul 17 | – |
| Basil | May 15 – 29 | Jun 26 – Jul 3 | – |
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 19 | May 12 | April 26 |
| Fall frost before | September 12 | September 30 | October 17 |
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 12 in a late year), and the first one in fall around October 14.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Mullan
Where these dates come from
NOAA weather station MULLAN, ID US (USC00106230), 1991–2020 climate normals. It's the nearest station for 1 zip code, all within 4 miles:
83846
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.