Willamina, OR frost dates
Last spring frostMay 20median date
First fall frostOct 23median date
Growing season156 daysfrost-free
Hardiness zone8bZone 8b
How Willamina compares
- In 8 years out of 10, the last spring frost in Willamina falls between April 28 and June 8, a 41-day window. The first fall frost falls between October 5 and November 9.
- The median last frost is 34 days later than the Oregon median of Apr 16.
- Its 156-day growing season is longer than 29% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 65 days later than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 115 nights a year at or below 32°F.
- Compared with Salem, OR, 42 km away, the last frost here is 47 days later than there and the growing season is 56 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 28 |
| 50% (median) | May 20 |
| 10% (safe for tender plants) | June 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 23 |
| 90% (late) | November 9 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Willamina, OR
Willamina, OR frost dates — last frost May 20, first frost Oct 23, zone 8b. whenisthelastfrost.com
Crop
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Start indoors: Feb 25 to Mar 11Transplant outside: Apr 22 to May 6
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Sow outdoors: Apr 22 to May 27Plant for fall: Aug 28 to Sep 25
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 22 to May 6Sow outdoors: Apr 22 to May 6Plant for fall: Aug 14 to Sep 4
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jul 17 to Aug 7
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 27 to Jun 10
Sow outdoors: Apr 8 to Apr 29Plant for fall: Jul 31 to Aug 21
Sow outdoors: Apr 8 to Apr 29Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 15 to May 27Plant for fall: Sep 11 to Oct 2
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 10Sow outdoors: May 27 to Jun 10Plant for fall: Aug 7 to Aug 21
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10Plant for fall: Aug 14 to Aug 28
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 29 to May 27Plant for fall: Jul 31 to Aug 14
Sow outdoors: Apr 29 to May 27Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 29 to May 20
Sow outdoors: May 6 to Jun 3Plant for fall: Aug 14 to Aug 28
Sow outdoors: May 6 to May 27Plant for fall: Aug 28 to Sep 18
Sow outdoors: May 27 to Jun 17Plant for fall: Aug 7 to Aug 21
Sow outdoors: May 27 to Jun 10
Transplant outside: Jun 3 to Jun 24
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Willamina, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 25 – Mar 11 | Apr 22 – May 6 | — | — |
| Peppers | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Eggplant | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Tomatoes | Mar 25 – Apr 8 | May 27 – Jun 10 | — | — |
| Lettuce | Mar 25 – Apr 8 | Apr 29 – May 13 | Apr 22 – May 27 | Aug 28 – Sep 25 |
| Kale | Mar 25 – Apr 8 | Apr 22 – May 6 | Apr 22 – May 6 | Aug 14 – Sep 4 |
| Broccoli | Mar 25 – Apr 8 | May 6 – May 20 | — | Jul 17 – Aug 7 |
| Cabbage | Mar 25 – Apr 8 | Apr 29 – May 13 | — | Jul 17 – Aug 7 |
| Cauliflower | Mar 25 – Apr 8 | May 6 – May 20 | — | Jul 17 – Aug 7 |
| Okra | Apr 8 – Apr 22 | Jun 10 – Jun 24 | Jun 10 – Jun 24 | — |
| Basil | Apr 8 – Apr 22 | May 27 – Jun 10 | — | — |
| Peas | — | — | Apr 8 – Apr 29 | Jul 31 – Aug 21 |
| Spinach | — | — | Apr 8 – Apr 29 | Aug 28 – Sep 18 |
| Radishes | — | — | Apr 15 – May 27 | Sep 11 – Oct 2 |
| Cucumbers | Apr 22 – Apr 29 | Jun 3 – Jun 10 | May 27 – Jun 10 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Apr 22 – Apr 29 | — | May 27 – Jun 10 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Apr 22 – Apr 29 | — | May 27 – Jun 10 | — |
| Melons & Watermelon | Apr 22 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Carrots | — | — | Apr 29 – May 27 | Jul 31 – Aug 14 |
| Beets | — | — | Apr 29 – May 27 | Aug 14 – Aug 28 |
| Potatoes | — | — | Apr 29 – May 20 | — |
| Swiss Chard | — | — | May 6 – Jun 3 | Aug 14 – Aug 28 |
| Cilantro | — | — | May 6 – May 27 | Aug 28 – Sep 18 |
| Green Beans | — | — | May 27 – Jun 17 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | May 27 – Jun 10 | — |
| Sweet Potatoes | — | Jun 3 – Jun 24 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Laurel Mtn, OR weather station, 19 km away (elevation 3,589 ft (1,094 m)).
Frost dates near Willamina
- Sheridan Apr 16 · Nov 1
- Grand Ronde May 20 · Oct 23
- Dallas Apr 16 · Nov 1
- Falls City Apr 18 · Nov 7
- Rickreall Apr 16 · Nov 1
- Amity Apr 15 · Oct 26
- Mcminnville Apr 5 · Nov 7
- Hebo Mar 17 · Nov 22
- Beaver Mar 17 · Nov 22
- Monmouth Apr 16 · Nov 1
Frequently asked questions
When is the last frost in Willamina, OR?
The median last spring frost in Willamina, OR is May 20. There is still about a 10% chance of frost after June 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Willamina, OR?
The median first fall frost is October 23, with about a 10% chance of frost before October 5.
How long is the growing season in Willamina, OR?
About 156 days between the median last spring frost and first fall frost.
What planting zone is Willamina, OR?
Willamina, OR is in USDA hardiness zone 8b.