Warren, OR frost dates
Last spring frostApr 18median date
First fall frostNov 7median date
Growing season203 daysfrost-free
Hardiness zone8bZone 8b
How Warren compares
- In 8 years out of 10, the last spring frost in Warren falls between March 20 and May 26, a 67-day window. The first fall frost falls between October 21 and November 26.
- The median last frost is 2 days later than the Oregon median of Apr 16.
- Its 203-day growing season is longer than 57% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 33 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 59 nights a year at or below 32°F.
- Compared with Vancouver, WA, 27 km away, the last frost here is 8 days earlier than there and the growing season is 28 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 20 |
| 50% (median) | April 18 |
| 10% (safe for tender plants) | May 26 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 21 |
| 50% (median) | November 7 |
| 90% (late) | November 26 |
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 Warren, OR
Warren, OR frost dates — last frost Apr 18, first frost Nov 7, zone 8b. whenisthelastfrost.com
Crop
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Start indoors: Jan 24 to Feb 7Transplant outside: Mar 21 to Apr 4
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 21 to Apr 25Plant for fall: Sep 12 to Oct 10
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 21 to Apr 4Plant for fall: Aug 29 to Sep 19
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Aug 1 to Aug 22
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Plant for fall: Aug 1 to Aug 22
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Aug 1 to Aug 22
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 7 to Mar 28Plant for fall: Aug 15 to Sep 5
Sow outdoors: Mar 7 to Mar 28Plant for fall: Sep 12 to Oct 3
Sow outdoors: Mar 14 to Apr 25Plant for fall: Sep 26 to Oct 17
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Aug 22 to Sep 5
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9Plant for fall: Aug 29 to Sep 12
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 29 to Sep 12
Sow outdoors: Mar 28 to Apr 18
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 29 to Sep 12
Sow outdoors: Apr 4 to Apr 25Plant for fall: Sep 12 to Oct 3
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 22 to Sep 5
Sow outdoors: Apr 25 to May 9
Transplant outside: May 2 to May 23
Plant for fall: Oct 24 to Nov 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Warren, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 24 – Feb 7 | Mar 21 – Apr 4 | — | — |
| Peppers | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Eggplant | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Tomatoes | Feb 21 – Mar 7 | Apr 25 – May 9 | — | — |
| Lettuce | Feb 21 – Mar 7 | Mar 28 – Apr 11 | Mar 21 – Apr 25 | Sep 12 – Oct 10 |
| Kale | Feb 21 – Mar 7 | Mar 21 – Apr 4 | Mar 21 – Apr 4 | Aug 29 – Sep 19 |
| Broccoli | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Aug 1 – Aug 22 |
| Cabbage | Feb 21 – Mar 7 | Mar 28 – Apr 11 | — | Aug 1 – Aug 22 |
| Cauliflower | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Aug 1 – Aug 22 |
| Okra | Mar 7 – Mar 21 | May 9 – May 23 | May 9 – May 23 | — |
| Basil | Mar 7 – Mar 21 | Apr 25 – May 9 | — | — |
| Peas | — | — | Mar 7 – Mar 28 | Aug 15 – Sep 5 |
| Spinach | — | — | Mar 7 – Mar 28 | Sep 12 – Oct 3 |
| Radishes | — | — | Mar 14 – Apr 25 | Sep 26 – Oct 17 |
| Cucumbers | Mar 21 – Mar 28 | May 2 – May 9 | Apr 25 – May 9 | Aug 22 – Sep 5 |
| Zucchini & Summer Squash | Mar 21 – Mar 28 | — | Apr 25 – May 9 | Aug 29 – Sep 12 |
| Winter Squash & Pumpkins | Mar 21 – Mar 28 | — | Apr 25 – May 9 | — |
| Melons & Watermelon | Mar 21 – Mar 28 | May 2 – May 16 | — | — |
| Carrots | — | — | Mar 28 – Apr 25 | Aug 15 – Aug 29 |
| Beets | — | — | Mar 28 – Apr 25 | Aug 29 – Sep 12 |
| Potatoes | — | — | Mar 28 – Apr 18 | — |
| Swiss Chard | — | — | Apr 4 – May 2 | Aug 29 – Sep 12 |
| Cilantro | — | — | Apr 4 – Apr 25 | Sep 12 – Oct 3 |
| Green Beans | — | — | Apr 25 – May 16 | Aug 22 – Sep 5 |
| Sweet Corn | — | — | Apr 25 – May 9 | — |
| Sweet Potatoes | — | May 2 – May 23 | — | — |
| Garlic | — | — | — | Oct 24 – Nov 28 |
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 Saint Helens Rfd, OR weather station, 3 km away (elevation 269 ft (82 m)).
Frost dates near Warren
- Saint Helens Apr 18 · Nov 7
- Scappoose Apr 10 · Nov 2
- Columbia City Apr 18 · Nov 7
- Deer Island Apr 18 · Nov 7
- North Plains Apr 16 · Oct 23
- Vernonia May 8 · Oct 1
- Banks Apr 16 · Oct 26
- Rainier Apr 8 · Nov 5
- Buxton May 8 · Oct 1
- Manning Apr 16 · Oct 26
Frequently asked questions
When is the last frost in Warren, OR?
The median last spring frost in Warren, OR is April 18. There is still about a 10% chance of frost after May 26, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Warren, OR?
The median first fall frost is November 7, with about a 10% chance of frost before October 21.
How long is the growing season in Warren, OR?
About 203 days between the median last spring frost and first fall frost.
What planting zone is Warren, OR?
Warren, OR is in USDA hardiness zone 8b.