Frost dates for Mapleton, 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
February 15
typical year
Safe to plant
March 19
frost is over in 9 of 10 years
First fall frost
December 9
typical year
Growing season
306 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 | – | Jan 18 – Feb 1 | – |
| Spinach | – | Jan 4 – 25 | Oct 14 – 28 |
| Lettuce | – | Jan 18 – Feb 8 | Oct 14 – 28 |
| Radishes | – | Jan 18 – Mar 1 | Oct 28 – Nov 11 |
| Onions | – | Jan 18 – Feb 1 | – |
| Potatoes | – | Jan 25 – Feb 8 | – |
| Carrots | – | Jan 25 – Feb 15 | Sep 16 – 30 |
| Beets | – | Jan 18 – Feb 1 | Sep 30 – Oct 14 |
| Kale | Dec 7 – 21 | Jan 18 – Feb 1 | Sep 30 – Oct 14 |
| Broccoli | Dec 7 – 21 | Feb 1 – 15 | Sep 30 – Oct 14 |
| Cabbage | Nov 23 – Dec 7 | Jan 18 – Feb 1 | Sep 30 – Oct 14 |
| Garlic | – | – | Oct 28 – Nov 18 |
| Warm-season crops | |||
| Tomatoes | Jan 22 – Feb 5 | Mar 19 – Apr 2 | – |
| Peppers | Jan 15 – 29 | Mar 26 – Apr 9 | – |
| Cucumbers | – | Mar 19 – Apr 9 | – |
| Zucchini | – | Mar 19 – Apr 16 | – |
| Pumpkins | – | Mar 19 – Apr 9 | – |
| Green beans | – | Mar 19 – Sep 30 | – |
| Sweet corn | – | Mar 19 – Apr 16 | – |
| Basil | Feb 12 – 26 | Mar 26 – Apr 2 | – |
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 | March 19 | February 15 | December 23 |
| Fall frost before | November 9 | December 9 | January 24 |
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 January 6 (February 19 in a late year), and the first one in fall around December 25.
Where these dates come from
NOAA weather station MAPLETON, OR US (USC00355204), 1991–2020 climate normals. It's the nearest station for 3 zip codes, all within 11 miles:
97430, 97453, 97480
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.