Mitchell, OR frost dates
Last spring frostMay 22median date
First fall frostOct 4median date
Growing season135 daysfrost-free
Hardiness zone7aZone 7a
How Mitchell compares
- In 8 years out of 10, the last spring frost in Mitchell falls between May 1 and June 11, a 41-day window. The first fall frost falls between September 16 and October 20.
- The median last frost is 36 days later than the Oregon median of Apr 16.
- Its 135-day growing season is longer than 16% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 36 days later 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 136 nights a year at or below 32°F.
- Compared with Bend, OR, 109 km away, the last frost here is 15 days earlier than there and the growing season is 29 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 1 |
| 50% (median) | May 22 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 16 |
| 50% (median) | October 4 |
| 90% (late) | October 20 |
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 Mitchell, OR
Mitchell, OR frost dates — last frost May 22, first frost Oct 4, zone 7a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 24 to May 8
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 27 to Apr 10Transplant outside: May 29 to Jun 12
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Sow outdoors: Apr 24 to May 29Plant for fall: Aug 9 to Sep 6
Start indoors: Mar 27 to Apr 10Transplant outside: Apr 24 to May 8Sow outdoors: Apr 24 to May 8Plant for fall: Jul 26 to Aug 16
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 28 to Jul 19
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 29 to Jun 12
Sow outdoors: Apr 10 to May 1Plant for fall: Jul 12 to Aug 2
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 9 to Aug 30
Sow outdoors: Apr 17 to May 29Plant for fall: Aug 23 to Sep 13
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 12Sow outdoors: May 29 to Jun 12Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12Plant for fall: Jul 26 to Aug 9
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 19
Sow outdoors: May 1 to May 29Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 1 to May 29Plant for fall: Jul 26 to Aug 9
Sow outdoors: May 1 to May 22
Sow outdoors: May 8 to Jun 5Plant for fall: Jul 26 to Aug 9
Sow outdoors: May 8 to May 29Plant for fall: Aug 9 to Aug 30
Sow outdoors: May 29 to Jun 19Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 29 to Jun 12
Transplant outside: Jun 5 to Jun 26
Plant for fall: Sep 20 to Oct 25
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mitchell, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 27 – Mar 13 | Apr 24 – May 8 | — | — |
| Peppers | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Eggplant | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Tomatoes | Mar 27 – Apr 10 | May 29 – Jun 12 | — | — |
| Lettuce | Mar 27 – Apr 10 | May 1 – May 15 | Apr 24 – May 29 | Aug 9 – Sep 6 |
| Kale | Mar 27 – Apr 10 | Apr 24 – May 8 | Apr 24 – May 8 | Jul 26 – Aug 16 |
| Broccoli | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 28 – Jul 19 |
| Cabbage | Mar 27 – Apr 10 | May 1 – May 15 | — | Jun 28 – Jul 19 |
| Cauliflower | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 28 – Jul 19 |
| Okra | Apr 10 – Apr 24 | Jun 12 – Jun 26 | Jun 12 – Jun 26 | — |
| Basil | Apr 10 – Apr 24 | May 29 – Jun 12 | — | — |
| Peas | — | — | Apr 10 – May 1 | Jul 12 – Aug 2 |
| Spinach | — | — | Apr 10 – May 1 | Aug 9 – Aug 30 |
| Radishes | — | — | Apr 17 – May 29 | Aug 23 – Sep 13 |
| Cucumbers | Apr 24 – May 1 | Jun 5 – Jun 12 | May 29 – Jun 12 | Jul 19 – Aug 2 |
| Zucchini & Summer Squash | Apr 24 – May 1 | — | May 29 – Jun 12 | Jul 26 – Aug 9 |
| Winter Squash & Pumpkins | Apr 24 – May 1 | — | May 29 – Jun 12 | — |
| Melons & Watermelon | Apr 24 – May 1 | Jun 5 – Jun 19 | — | — |
| Carrots | — | — | May 1 – May 29 | Jul 12 – Jul 26 |
| Beets | — | — | May 1 – May 29 | Jul 26 – Aug 9 |
| Potatoes | — | — | May 1 – May 22 | — |
| Swiss Chard | — | — | May 8 – Jun 5 | Jul 26 – Aug 9 |
| Cilantro | — | — | May 8 – May 29 | Aug 9 – Aug 30 |
| Green Beans | — | — | May 29 – Jun 19 | Jul 19 – Aug 2 |
| Sweet Corn | — | — | May 29 – Jun 12 | — |
| Sweet Potatoes | — | Jun 5 – Jun 26 | — | — |
| Garlic | — | — | — | Sep 20 – Oct 25 |
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 Mitchell 2 E, OR weather station, 2 km away (elevation 3,320 ft (1,012 m)).
Frost dates near Mitchell
- Spray May 9 · Sep 27
- Fossil Jun 3 · Sep 14
- Kimberly May 9 · Sep 27
- Ashwood May 22 · Oct 3
- Paulina frost any month
- Dayville May 4 · Oct 6
- Post Jun 2 · Sep 17
- Prineville Jun 1 · Sep 22
- Antelope May 22 · Oct 3
- Monument May 9 · Sep 27
Frequently asked questions
When is the last frost in Mitchell, OR?
The median last spring frost in Mitchell, OR is May 22. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mitchell, OR?
The median first fall frost is October 4, with about a 10% chance of frost before September 16.
How long is the growing season in Mitchell, OR?
About 135 days between the median last spring frost and first fall frost.
What planting zone is Mitchell, OR?
Mitchell, OR is in USDA hardiness zone 7a.