Frost dates for Owyhee Dam, OR
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 7
typical year
Safe to plant
May 27
frost is over in 9 of 10 years
First fall frost
October 5
typical year
Growing season
150 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 9 – 23 | – |
| Spinach | – | Mar 26 – Apr 16 | Aug 10 – 24 |
| Lettuce | – | Apr 9 – 30 | Aug 10 – 24 |
| Radishes | – | Apr 9 – May 21 | Aug 24 – Sep 7 |
| Onions | – | Apr 9 – 23 | – |
| Potatoes | – | Apr 16 – 30 | – |
| Carrots | – | Apr 16 – May 7 | Jul 13 – 27 |
| Beets | – | Apr 9 – 23 | Jul 27 – Aug 10 |
| Kale | Feb 26 – Mar 12 | Apr 9 – 23 | Jul 27 – Aug 10 |
| Broccoli | Feb 26 – Mar 12 | Apr 23 – May 7 | Jul 27 – Aug 10 |
| Cabbage | Feb 12 – 26 | Apr 9 – 23 | Jul 27 – Aug 10 |
| Garlic | – | – | Aug 24 – Sep 14 |
| Warm-season crops | |||
| Tomatoes | Apr 1 – 15 | May 27 – Jun 10 | – |
| Peppers | Mar 25 – Apr 8 | Jun 3 – 17 | – |
| Cucumbers | – | May 27 – Jun 17 | – |
| Zucchini | – | May 27 – Jun 24 | – |
| Pumpkins | – | May 27 – Jun 17 | – |
| Green beans | – | May 27 – Jul 27 | – |
| Sweet corn | – | May 27 – Jun 24 | – |
| Basil | Apr 22 – May 6 | Jun 3 – 10 | – |
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 27 | May 7 | April 23 |
| Fall frost before | September 19 | October 5 | October 20 |
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 21 (May 7 in a late year), and the first one in fall around October 18.
Where these dates come from
NOAA weather station OWYHEE DAM, OR US (USC00356405), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 9 miles:
97901, 97913
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.