Frost dates for Mill City, 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
March 9
typical year
Safe to plant
April 8
frost is over in 9 of 10 years
First fall frost
December 3
typical year
Growing season
270 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 | – | Feb 9 – 23 | – |
| Spinach | – | Jan 26 – Feb 16 | Oct 8 – 22 |
| Lettuce | – | Feb 9 – Mar 2 | Oct 8 – 22 |
| Radishes | – | Feb 9 – Mar 23 | Oct 22 – Nov 5 |
| Onions | – | Feb 9 – 23 | – |
| Potatoes | – | Feb 16 – Mar 2 | – |
| Carrots | – | Feb 16 – Mar 9 | Sep 10 – 24 |
| Beets | – | Feb 9 – 23 | Sep 24 – Oct 8 |
| Kale | Dec 29 – Jan 12 | Feb 9 – 23 | Sep 24 – Oct 8 |
| Broccoli | Dec 29 – Jan 12 | Feb 23 – Mar 9 | Sep 24 – Oct 8 |
| Cabbage | Dec 15 – 29 | Feb 9 – 23 | Sep 24 – Oct 8 |
| Garlic | – | – | Oct 22 – Nov 12 |
| Warm-season crops | |||
| Tomatoes | Feb 11 – 25 | Apr 8 – 22 | – |
| Peppers | Feb 4 – 18 | Apr 15 – 29 | – |
| Cucumbers | – | Apr 8 – 29 | – |
| Zucchini | – | Apr 8 – May 6 | – |
| Pumpkins | – | Apr 8 – 29 | – |
| Green beans | – | Apr 8 – Sep 24 | – |
| Sweet corn | – | Apr 8 – May 6 | – |
| Basil | Mar 4 – 18 | Apr 15 – 22 | – |
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 | April 8 | March 9 | February 2 |
| Fall frost before | November 8 | December 3 | January 4 |
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 February 5 (March 8 in a late year), and the first one in fall around December 26.
Towns that use these dates
This is the nearest NOAA station with frost records for 4 towns.
Mill City, Gates, Detroit, Idanha
Where these dates come from
NOAA weather station DETROIT DAM, OR US (USC00352292), 1991–2020 climate normals. It's the nearest station for 3 zip codes, all within 11 miles:
97346, 97358, 97360
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.