Frost dates for Downey, 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 31
typical year
Safe to plant
June 16
frost is over in 9 of 10 years
First fall frost
September 18
typical year
Growing season
110 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 3 – 17 | – |
| Spinach | – | Apr 19 – May 10 | Jul 24 – Aug 7 |
| Lettuce | – | May 3 – 24 | Jul 24 – Aug 7 |
| Radishes | – | May 3 – Jun 14 | Aug 7 – 21 |
| Onions | – | May 3 – 17 | – |
| Potatoes | – | May 10 – 24 | – |
| Carrots | – | May 10 – 31 | Jun 26 – Jul 10 |
| Beets | – | May 3 – 17 | Jul 10 – 24 |
| Kale | Mar 22 – Apr 5 | May 3 – 17 | Jul 10 – 24 |
| Broccoli | Mar 22 – Apr 5 | May 17 – 31 | Jul 10 – 24 |
| Cabbage | Mar 8 – 22 | May 3 – 17 | Jul 10 – 24 |
| Garlic | – | – | Aug 7 – 28 |
| Warm-season crops | |||
| Tomatoes | Apr 21 – May 5 | Jun 16 – 30 | – |
| Peppers | Apr 14 – 28 | Jun 23 – Jul 7 | – |
| Cucumbers | – | Jun 16 – Jul 7 | – |
| Zucchini | – | Jun 16 – Jul 14 | – |
| Pumpkins | Season usually too short. Try a quick variety or row covers. | ||
| Green beans | – | Jun 16 – Jul 10 | – |
| Sweet corn | – | Jun 16 – Jul 14 | – |
| Basil | May 12 – 26 | Jun 23 – 30 | – |
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 16 | May 31 | May 13 |
| Fall frost before | September 3 | September 18 | October 5 |
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 9 (May 31 in a late year), and the first one in fall around October 1.
Towns that use these dates
This is the nearest NOAA station with frost records for 2 towns.
Downey, Oxford
Where these dates come from
NOAA weather station DOWNEY, ID US (USC00102667), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 12 miles:
83234, 83281
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.