Frost dates for Fossil, 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
June 3
typical year
Safe to plant
July 3
frost is over in 9 of 10 years
First fall frost
September 14
typical year
Growing season
98 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 6 – 20 | – |
| Spinach | – | Apr 22 – May 13 | Jul 20 – Aug 3 |
| Lettuce | – | May 6 – 27 | Jul 20 – Aug 3 |
| Radishes | – | May 6 – Jun 17 | Aug 3 – 17 |
| Onions | – | May 6 – 20 | – |
| Potatoes | Season usually too short. Try a quick variety or row covers. | ||
| Carrots | – | May 13 – Jun 3 | Jun 22 – Jul 6 |
| Beets | – | May 6 – 20 | Jul 6 – 20 |
| Kale | Mar 25 – Apr 8 | May 6 – 20 | Jul 6 – 20 |
| Broccoli | Mar 25 – Apr 8 | May 20 – Jun 3 | Jul 6 – 20 |
| Cabbage | Mar 11 – 25 | May 6 – 20 | Jul 6 – 20 |
| Garlic | – | – | Aug 3 – 24 |
| Warm-season crops | |||
| Tomatoes | Season usually too short. Try a quick variety or row covers. | ||
| Peppers | Season usually too short. Try a quick variety or row covers. | ||
| Cucumbers | – | Jul 3 – 24 | – |
| Zucchini | – | Jul 3 – 31 | – |
| Pumpkins | Season usually too short. Try a quick variety or row covers. | ||
| Green beans | – | Jul 3 – 6 | – |
| Sweet corn | Season usually too short. Try a quick variety or row covers. | ||
| Basil | May 29 – Jun 12 | Jul 10 – 17 | – |
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 | July 3 | June 3 | May 13 |
| Fall frost before | August 25 | September 14 | October 3 |
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 10 (June 1 in a late year), and the first one in fall around October 2.
Towns that use these dates
This is the nearest NOAA station with frost records for 2 towns.
Fossil, Lonerock
Where these dates come from
NOAA weather station FOSSIL, OR US (USC00353038), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 12 miles:
97750, 97830
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.