Boring, OR frost dates
Last spring frostMar 16median date
First fall frostNov 20median date
Growing season249 daysfrost-free
Hardiness zone8bZone 8b
How Boring compares
- In 8 years out of 10, the last spring frost in Boring falls between February 18 and April 12, a 53-day window. The first fall frost falls between October 30 and December 17.
- The median last frost is 31 days earlier than the Oregon median of Apr 16.
- Its 249-day growing season is longer than 90% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is typical for zone 8b, where the median is Mar 16.
- The weather station records an average of 28 nights a year at or below 32°F.
- Boring shares its weather station with Gresham, OR, 8 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 18 |
| 50% (median) | March 16 |
| 10% (safe for tender plants) | April 12 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 30 |
| 50% (median) | November 20 |
| 90% (late) | December 17 |
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 Boring, OR
Boring, OR frost dates — last frost Mar 16, first frost Nov 20, zone 8b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 22 to Jan 5Start indoors: Dec 22 to Jan 5Transplant outside: Feb 16 to Mar 2
Start indoors: Jan 5 to Jan 19Transplant outside: Mar 30 to Apr 13
Start indoors: Jan 5 to Jan 19Transplant outside: Mar 30 to Apr 13
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 23 to Apr 6
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 23 to Mar 9Sow outdoors: Feb 16 to Mar 23Plant for fall: Sep 25 to Oct 23
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 16 to Mar 2Sow outdoors: Feb 16 to Mar 2Plant for fall: Sep 11 to Oct 2
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 2 to Mar 16Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 23 to Mar 9Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 2 to Mar 16Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 6 to Apr 20Sow outdoors: Apr 6 to Apr 20
Start indoors: Feb 2 to Feb 16Transplant outside: Mar 23 to Apr 6
Sow outdoors: Feb 2 to Feb 23Plant for fall: Aug 28 to Sep 18
Sow outdoors: Feb 2 to Feb 23Plant for fall: Sep 25 to Oct 16
Sow outdoors: Feb 9 to Mar 23Plant for fall: Oct 9 to Oct 30
Start indoors: Feb 16 to Feb 23Transplant outside: Mar 30 to Apr 6Sow outdoors: Mar 23 to Apr 6Plant for fall: Sep 4 to Sep 18
Start indoors: Feb 16 to Feb 23Sow outdoors: Mar 23 to Apr 6Plant for fall: Sep 11 to Sep 25
Start indoors: Feb 16 to Feb 23Sow outdoors: Mar 23 to Apr 6
Start indoors: Feb 16 to Feb 23Transplant outside: Mar 30 to Apr 13
Sow outdoors: Feb 23 to Mar 23Plant for fall: Aug 28 to Sep 11
Sow outdoors: Feb 23 to Mar 23Plant for fall: Sep 11 to Sep 25
Sow outdoors: Feb 23 to Mar 16
Sow outdoors: Mar 2 to Mar 30Plant for fall: Sep 11 to Sep 25
Sow outdoors: Mar 2 to Mar 23Plant for fall: Sep 25 to Oct 16
Sow outdoors: Mar 23 to Apr 13Plant for fall: Sep 4 to Sep 18
Sow outdoors: Mar 23 to Apr 6
Transplant outside: Mar 30 to Apr 20
Plant for fall: Nov 6 to Dec 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Boring, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 22 – Jan 5 | Feb 16 – Mar 2 | — | — |
| Peppers | Jan 5 – Jan 19 | Mar 30 – Apr 13 | — | — |
| Eggplant | Jan 5 – Jan 19 | Mar 30 – Apr 13 | — | — |
| Tomatoes | Jan 19 – Feb 2 | Mar 23 – Apr 6 | — | — |
| Lettuce | Jan 19 – Feb 2 | Feb 23 – Mar 9 | Feb 16 – Mar 23 | Sep 25 – Oct 23 |
| Kale | Jan 19 – Feb 2 | Feb 16 – Mar 2 | Feb 16 – Mar 2 | Sep 11 – Oct 2 |
| Broccoli | Jan 19 – Feb 2 | Mar 2 – Mar 16 | — | Aug 14 – Sep 4 |
| Cabbage | Jan 19 – Feb 2 | Feb 23 – Mar 9 | — | Aug 14 – Sep 4 |
| Cauliflower | Jan 19 – Feb 2 | Mar 2 – Mar 16 | — | Aug 14 – Sep 4 |
| Okra | Feb 2 – Feb 16 | Apr 6 – Apr 20 | Apr 6 – Apr 20 | — |
| Basil | Feb 2 – Feb 16 | Mar 23 – Apr 6 | — | — |
| Peas | — | — | Feb 2 – Feb 23 | Aug 28 – Sep 18 |
| Spinach | — | — | Feb 2 – Feb 23 | Sep 25 – Oct 16 |
| Radishes | — | — | Feb 9 – Mar 23 | Oct 9 – Oct 30 |
| Cucumbers | Feb 16 – Feb 23 | Mar 30 – Apr 6 | Mar 23 – Apr 6 | Sep 4 – Sep 18 |
| Zucchini & Summer Squash | Feb 16 – Feb 23 | — | Mar 23 – Apr 6 | Sep 11 – Sep 25 |
| Winter Squash & Pumpkins | Feb 16 – Feb 23 | — | Mar 23 – Apr 6 | — |
| Melons & Watermelon | Feb 16 – Feb 23 | Mar 30 – Apr 13 | — | — |
| Carrots | — | — | Feb 23 – Mar 23 | Aug 28 – Sep 11 |
| Beets | — | — | Feb 23 – Mar 23 | Sep 11 – Sep 25 |
| Potatoes | — | — | Feb 23 – Mar 16 | — |
| Swiss Chard | — | — | Mar 2 – Mar 30 | Sep 11 – Sep 25 |
| Cilantro | — | — | Mar 2 – Mar 23 | Sep 25 – Oct 16 |
| Green Beans | — | — | Mar 23 – Apr 13 | Sep 4 – Sep 18 |
| Sweet Corn | — | — | Mar 23 – Apr 6 | — |
| Sweet Potatoes | — | Mar 30 – Apr 20 | — | — |
| Garlic | — | — | — | Nov 6 – Dec 11 |
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 Portland Troutdale Ap, OR weather station, 14 km away (elevation 30 ft (9 m)).
Frost dates near Boring
- Damascus Mar 18 · Nov 18
- Gresham Mar 16 · Nov 20
- Eagle Creek Mar 27 · Nov 14
- Troutdale Mar 26 · Nov 17
- Clackamas Mar 18 · Nov 18
- Happy Valley Mar 18 · Nov 18
- Sandy Mar 27 · Nov 18
- Fairview Mar 16 · Nov 20
- Corbett Mar 27 · Nov 18
- Estacada Mar 27 · Nov 14
Frequently asked questions
When is the last frost in Boring, OR?
The median last spring frost in Boring, OR is March 16. There is still about a 10% chance of frost after April 12, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Boring, OR?
The median first fall frost is November 20, with about a 10% chance of frost before October 30.
How long is the growing season in Boring, OR?
About 249 days between the median last spring frost and first fall frost.
What planting zone is Boring, OR?
Boring, OR is in USDA hardiness zone 8b.