Newberg, OR frost dates
Last spring frostMar 21median date
First fall frostNov 22median date
Growing season246 daysfrost-free
Hardiness zone8bZone 8b
How Newberg compares
- In 8 years out of 10, the last spring frost in Newberg falls between February 23 and April 19, a 55-day window. The first fall frost falls between November 4 and December 12.
- The median last frost is 26 days earlier than the Oregon median of Apr 16.
- Its 246-day growing season is longer than 87% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 5 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 43 nights a year at or below 32°F.
- Compared with Beaverton, OR, 22 km away, the last frost here is 38 days later than there and the growing season is 51 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 23 |
| 50% (median) | March 21 |
| 10% (safe for tender plants) | April 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 4 |
| 50% (median) | November 22 |
| 90% (late) | December 12 |
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 Newberg, OR
Newberg, OR frost dates — last frost Mar 21, first frost Nov 22, zone 8b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 27 to Jan 10Start indoors: Dec 27 to Jan 10Transplant outside: Feb 21 to Mar 7
Start indoors: Jan 10 to Jan 24Transplant outside: Apr 4 to Apr 18
Start indoors: Jan 10 to Jan 24Transplant outside: Apr 4 to Apr 18
Start indoors: Jan 24 to Feb 7Transplant outside: Mar 28 to Apr 11
Start indoors: Jan 24 to Feb 7Transplant outside: Feb 28 to Mar 14Sow outdoors: Feb 21 to Mar 28Plant for fall: Sep 27 to Oct 25
Start indoors: Jan 24 to Feb 7Transplant outside: Feb 21 to Mar 7Sow outdoors: Feb 21 to Mar 7Plant for fall: Sep 13 to Oct 4
Start indoors: Jan 24 to Feb 7Transplant outside: Mar 7 to Mar 21Plant for fall: Aug 16 to Sep 6
Start indoors: Jan 24 to Feb 7Transplant outside: Feb 28 to Mar 14Plant for fall: Aug 16 to Sep 6
Start indoors: Jan 24 to Feb 7Transplant outside: Mar 7 to Mar 21Plant for fall: Aug 16 to Sep 6
Start indoors: Feb 7 to Feb 21Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 11 to Apr 25
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 28 to Apr 11
Sow outdoors: Feb 7 to Feb 28Plant for fall: Aug 30 to Sep 20
Sow outdoors: Feb 7 to Feb 28Plant for fall: Sep 27 to Oct 18
Sow outdoors: Feb 14 to Mar 28Plant for fall: Oct 11 to Nov 1
Start indoors: Feb 21 to Feb 28Transplant outside: Apr 4 to Apr 11Sow outdoors: Mar 28 to Apr 11Plant for fall: Sep 6 to Sep 20
Start indoors: Feb 21 to Feb 28Sow outdoors: Mar 28 to Apr 11Plant for fall: Sep 13 to Sep 27
Start indoors: Feb 21 to Feb 28Sow outdoors: Mar 28 to Apr 11
Start indoors: Feb 21 to Feb 28Transplant outside: Apr 4 to Apr 18
Sow outdoors: Feb 28 to Mar 28Plant for fall: Aug 30 to Sep 13
Sow outdoors: Feb 28 to Mar 28Plant for fall: Sep 13 to Sep 27
Sow outdoors: Feb 28 to Mar 21
Sow outdoors: Mar 7 to Apr 4Plant for fall: Sep 13 to Sep 27
Sow outdoors: Mar 7 to Mar 28Plant for fall: Sep 27 to Oct 18
Sow outdoors: Mar 28 to Apr 18Plant for fall: Sep 6 to Sep 20
Sow outdoors: Mar 28 to Apr 11
Transplant outside: Apr 4 to Apr 25
Plant for fall: Nov 8 to Dec 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Newberg, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 27 – Jan 10 | Feb 21 – Mar 7 | — | — |
| Peppers | Jan 10 – Jan 24 | Apr 4 – Apr 18 | — | — |
| Eggplant | Jan 10 – Jan 24 | Apr 4 – Apr 18 | — | — |
| Tomatoes | Jan 24 – Feb 7 | Mar 28 – Apr 11 | — | — |
| Lettuce | Jan 24 – Feb 7 | Feb 28 – Mar 14 | Feb 21 – Mar 28 | Sep 27 – Oct 25 |
| Kale | Jan 24 – Feb 7 | Feb 21 – Mar 7 | Feb 21 – Mar 7 | Sep 13 – Oct 4 |
| Broccoli | Jan 24 – Feb 7 | Mar 7 – Mar 21 | — | Aug 16 – Sep 6 |
| Cabbage | Jan 24 – Feb 7 | Feb 28 – Mar 14 | — | Aug 16 – Sep 6 |
| Cauliflower | Jan 24 – Feb 7 | Mar 7 – Mar 21 | — | Aug 16 – Sep 6 |
| Okra | Feb 7 – Feb 21 | Apr 11 – Apr 25 | Apr 11 – Apr 25 | — |
| Basil | Feb 7 – Feb 21 | Mar 28 – Apr 11 | — | — |
| Peas | — | — | Feb 7 – Feb 28 | Aug 30 – Sep 20 |
| Spinach | — | — | Feb 7 – Feb 28 | Sep 27 – Oct 18 |
| Radishes | — | — | Feb 14 – Mar 28 | Oct 11 – Nov 1 |
| Cucumbers | Feb 21 – Feb 28 | Apr 4 – Apr 11 | Mar 28 – Apr 11 | Sep 6 – Sep 20 |
| Zucchini & Summer Squash | Feb 21 – Feb 28 | — | Mar 28 – Apr 11 | Sep 13 – Sep 27 |
| Winter Squash & Pumpkins | Feb 21 – Feb 28 | — | Mar 28 – Apr 11 | — |
| Melons & Watermelon | Feb 21 – Feb 28 | Apr 4 – Apr 18 | — | — |
| Carrots | — | — | Feb 28 – Mar 28 | Aug 30 – Sep 13 |
| Beets | — | — | Feb 28 – Mar 28 | Sep 13 – Sep 27 |
| Potatoes | — | — | Feb 28 – Mar 21 | — |
| Swiss Chard | — | — | Mar 7 – Apr 4 | Sep 13 – Sep 27 |
| Cilantro | — | — | Mar 7 – Mar 28 | Sep 27 – Oct 18 |
| Green Beans | — | — | Mar 28 – Apr 18 | Sep 6 – Sep 20 |
| Sweet Corn | — | — | Mar 28 – Apr 11 | — |
| Sweet Potatoes | — | Apr 4 – Apr 25 | — | — |
| Garlic | — | — | — | Nov 8 – Dec 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 Rex 1 S, OR weather station, 4 km away (elevation 515 ft (157 m)).
Frost dates near Newberg
- Dundee Mar 21 · Nov 22
- Sherwood Mar 21 · Nov 22
- Saint Paul Mar 21 · Nov 22
- Lafayette Apr 5 · Nov 7
- Donald Mar 16 · Nov 14
- Carlton Apr 5 · Nov 7
- Dayton Apr 15 · Oct 26
- Wilsonville Mar 18 · Nov 13
- Aurora Mar 16 · Nov 14
- Tualatin Apr 1 · Nov 6
Frequently asked questions
When is the last frost in Newberg, OR?
The median last spring frost in Newberg, OR is March 21. There is still about a 10% chance of frost after April 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Newberg, OR?
The median first fall frost is November 22, with about a 10% chance of frost before November 4.
How long is the growing season in Newberg, OR?
About 246 days between the median last spring frost and first fall frost.
What planting zone is Newberg, OR?
Newberg, OR is in USDA hardiness zone 8b.