Oxbow, OR frost dates
Last spring frostApr 2median date
First fall frostNov 5median date
Growing season217 daysfrost-free
Hardiness zone7aZone 7a
How Oxbow compares
- In 8 years out of 10, the last spring frost in Oxbow falls between March 15 and April 20, a 36-day window. The first fall frost falls between October 24 and November 19.
- The median last frost is 14 days earlier than the Oregon median of Apr 16.
- Its 217-day growing season is longer than 65% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 14 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 79 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 15 |
| 50% (median) | April 2 |
| 10% (safe for tender plants) | April 20 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 24 |
| 50% (median) | November 5 |
| 90% (late) | November 19 |
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 Oxbow, OR
Oxbow, OR frost dates — last frost Apr 2, first frost Nov 5, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 8 to Jan 22Transplant outside: Mar 5 to Mar 19
Start indoors: Jan 22 to Feb 5Transplant outside: Apr 16 to Apr 30
Start indoors: Jan 22 to Feb 5Transplant outside: Apr 16 to Apr 30
Start indoors: Feb 5 to Feb 19Transplant outside: Apr 9 to Apr 23
Start indoors: Feb 5 to Feb 19Transplant outside: Mar 12 to Mar 26Sow outdoors: Mar 5 to Apr 9Plant for fall: Sep 10 to Oct 8
Start indoors: Feb 5 to Feb 19Transplant outside: Mar 5 to Mar 19Sow outdoors: Mar 5 to Mar 19Plant for fall: Aug 27 to Sep 17
Start indoors: Feb 5 to Feb 19Transplant outside: Mar 19 to Apr 2Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 5 to Feb 19Transplant outside: Mar 12 to Mar 26Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 5 to Feb 19Transplant outside: Mar 19 to Apr 2Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 9 to Apr 23
Sow outdoors: Feb 19 to Mar 12Plant for fall: Aug 13 to Sep 3
Sow outdoors: Feb 19 to Mar 12Plant for fall: Sep 10 to Oct 1
Sow outdoors: Feb 26 to Apr 9Plant for fall: Sep 24 to Oct 15
Start indoors: Mar 5 to Mar 12Transplant outside: Apr 16 to Apr 23Sow outdoors: Apr 9 to Apr 23Plant for fall: Aug 20 to Sep 3
Start indoors: Mar 5 to Mar 12Sow outdoors: Apr 9 to Apr 23Plant for fall: Aug 27 to Sep 10
Start indoors: Mar 5 to Mar 12Sow outdoors: Apr 9 to Apr 23
Start indoors: Mar 5 to Mar 12Transplant outside: Apr 16 to Apr 30
Sow outdoors: Mar 12 to Apr 9Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 12 to Apr 9Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 12 to Apr 2
Sow outdoors: Mar 19 to Apr 16Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 19 to Apr 9Plant for fall: Sep 10 to Oct 1
Sow outdoors: Apr 9 to Apr 30Plant for fall: Aug 20 to Sep 3
Sow outdoors: Apr 9 to Apr 23
Transplant outside: Apr 16 to May 7
Plant for fall: Oct 22 to Nov 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Oxbow, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 8 – Jan 22 | Mar 5 – Mar 19 | — | — |
| Peppers | Jan 22 – Feb 5 | Apr 16 – Apr 30 | — | — |
| Eggplant | Jan 22 – Feb 5 | Apr 16 – Apr 30 | — | — |
| Tomatoes | Feb 5 – Feb 19 | Apr 9 – Apr 23 | — | — |
| Lettuce | Feb 5 – Feb 19 | Mar 12 – Mar 26 | Mar 5 – Apr 9 | Sep 10 – Oct 8 |
| Kale | Feb 5 – Feb 19 | Mar 5 – Mar 19 | Mar 5 – Mar 19 | Aug 27 – Sep 17 |
| Broccoli | Feb 5 – Feb 19 | Mar 19 – Apr 2 | — | Jul 30 – Aug 20 |
| Cabbage | Feb 5 – Feb 19 | Mar 12 – Mar 26 | — | Jul 30 – Aug 20 |
| Cauliflower | Feb 5 – Feb 19 | Mar 19 – Apr 2 | — | Jul 30 – Aug 20 |
| Okra | Feb 19 – Mar 5 | Apr 23 – May 7 | Apr 23 – May 7 | — |
| Basil | Feb 19 – Mar 5 | Apr 9 – Apr 23 | — | — |
| Peas | — | — | Feb 19 – Mar 12 | Aug 13 – Sep 3 |
| Spinach | — | — | Feb 19 – Mar 12 | Sep 10 – Oct 1 |
| Radishes | — | — | Feb 26 – Apr 9 | Sep 24 – Oct 15 |
| Cucumbers | Mar 5 – Mar 12 | Apr 16 – Apr 23 | Apr 9 – Apr 23 | Aug 20 – Sep 3 |
| Zucchini & Summer Squash | Mar 5 – Mar 12 | — | Apr 9 – Apr 23 | Aug 27 – Sep 10 |
| Winter Squash & Pumpkins | Mar 5 – Mar 12 | — | Apr 9 – Apr 23 | — |
| Melons & Watermelon | Mar 5 – Mar 12 | Apr 16 – Apr 30 | — | — |
| Carrots | — | — | Mar 12 – Apr 9 | Aug 13 – Aug 27 |
| Beets | — | — | Mar 12 – Apr 9 | Aug 27 – Sep 10 |
| Potatoes | — | — | Mar 12 – Apr 2 | — |
| Swiss Chard | — | — | Mar 19 – Apr 16 | Aug 27 – Sep 10 |
| Cilantro | — | — | Mar 19 – Apr 9 | Sep 10 – Oct 1 |
| Green Beans | — | — | Apr 9 – Apr 30 | Aug 20 – Sep 3 |
| Sweet Corn | — | — | Apr 9 – Apr 23 | — |
| Sweet Potatoes | — | Apr 16 – May 7 | — | — |
| Garlic | — | — | — | Oct 22 – Nov 26 |
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 Brownlee Dam, ID weather station, 16 km away (elevation 1,844 ft (562 m)).
Frost dates near Oxbow
- Halfway May 15 · Sep 24
- Richland May 10 · Oct 1
- Joseph May 24 · Oct 1
- Imnaha Jun 8 · Sep 5
- Enterprise May 24 · Oct 1
- Durkee Apr 23 · Oct 13
- Lostine Jun 7 · Sep 9
- Huntington Apr 23 · Oct 13
- Baker City May 25 · Sep 15
- Union May 11 · Sep 26
Frequently asked questions
When is the last frost in Oxbow, OR?
The median last spring frost in Oxbow, OR is April 2. There is still about a 10% chance of frost after April 20, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Oxbow, OR?
The median first fall frost is November 5, with about a 10% chance of frost before October 24.
How long is the growing season in Oxbow, OR?
About 217 days between the median last spring frost and first fall frost.
What planting zone is Oxbow, OR?
Oxbow, OR is in USDA hardiness zone 7a.