Mikkalo, OR frost dates
Last spring frostMay 10median date
First fall frostOct 7median date
Growing season150 daysfrost-free
Hardiness zone7bZone 7b
How Mikkalo compares
- In 8 years out of 10, the last spring frost in Mikkalo falls between April 25 and May 27, a 32-day window. The first fall frost falls between September 21 and October 24.
- The median last frost is 24 days later than the Oregon median of Apr 16.
- Its 150-day growing season is longer than 26% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 35 days later than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 139 nights a year at or below 32°F.
- Compared with Kennewick, WA, 114 km away, the last frost here is 43 days later than there and the growing season is 66 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 25 |
| 50% (median) | May 10 |
| 10% (safe for tender plants) | May 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 21 |
| 50% (median) | October 7 |
| 90% (late) | October 24 |
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 Mikkalo, OR
Mikkalo, OR frost dates — last frost May 10, first frost Oct 7, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Feb 15 to Mar 1Transplant outside: Apr 12 to Apr 26
Start indoors: Mar 1 to Mar 15Transplant outside: May 24 to Jun 7
Start indoors: Mar 1 to Mar 15Transplant outside: May 24 to Jun 7
Start indoors: Mar 15 to Mar 29Transplant outside: May 17 to May 31
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 19 to May 3Sow outdoors: Apr 12 to May 17Plant for fall: Aug 12 to Sep 9
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 12 to Apr 26Sow outdoors: Apr 12 to Apr 26Plant for fall: Jul 29 to Aug 19
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 26 to May 10Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 19 to May 3Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 26 to May 10Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 29 to Apr 12Transplant outside: May 31 to Jun 14Sow outdoors: May 31 to Jun 14
Start indoors: Mar 29 to Apr 12Transplant outside: May 17 to May 31
Sow outdoors: Mar 29 to Apr 19Plant for fall: Jul 15 to Aug 5
Sow outdoors: Mar 29 to Apr 19Plant for fall: Aug 12 to Sep 2
Sow outdoors: Apr 5 to May 17Plant for fall: Aug 26 to Sep 16
Start indoors: Apr 12 to Apr 19Transplant outside: May 24 to May 31Sow outdoors: May 17 to May 31Plant for fall: Jul 22 to Aug 5
Start indoors: Apr 12 to Apr 19Sow outdoors: May 17 to May 31Plant for fall: Jul 29 to Aug 12
Start indoors: Apr 12 to Apr 19Sow outdoors: May 17 to May 31
Start indoors: Apr 12 to Apr 19Transplant outside: May 24 to Jun 7
Sow outdoors: Apr 19 to May 17Plant for fall: Jul 15 to Jul 29
Sow outdoors: Apr 19 to May 17Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 19 to May 10
Sow outdoors: Apr 26 to May 24Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 26 to May 17Plant for fall: Aug 12 to Sep 2
Sow outdoors: May 17 to Jun 7Plant for fall: Jul 22 to Aug 5
Sow outdoors: May 17 to May 31
Transplant outside: May 24 to Jun 14
Plant for fall: Sep 23 to Oct 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mikkalo, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 15 – Mar 1 | Apr 12 – Apr 26 | — | — |
| Peppers | Mar 1 – Mar 15 | May 24 – Jun 7 | — | — |
| Eggplant | Mar 1 – Mar 15 | May 24 – Jun 7 | — | — |
| Tomatoes | Mar 15 – Mar 29 | May 17 – May 31 | — | — |
| Lettuce | Mar 15 – Mar 29 | Apr 19 – May 3 | Apr 12 – May 17 | Aug 12 – Sep 9 |
| Kale | Mar 15 – Mar 29 | Apr 12 – Apr 26 | Apr 12 – Apr 26 | Jul 29 – Aug 19 |
| Broccoli | Mar 15 – Mar 29 | Apr 26 – May 10 | — | Jul 1 – Jul 22 |
| Cabbage | Mar 15 – Mar 29 | Apr 19 – May 3 | — | Jul 1 – Jul 22 |
| Cauliflower | Mar 15 – Mar 29 | Apr 26 – May 10 | — | Jul 1 – Jul 22 |
| Okra | Mar 29 – Apr 12 | May 31 – Jun 14 | May 31 – Jun 14 | — |
| Basil | Mar 29 – Apr 12 | May 17 – May 31 | — | — |
| Peas | — | — | Mar 29 – Apr 19 | Jul 15 – Aug 5 |
| Spinach | — | — | Mar 29 – Apr 19 | Aug 12 – Sep 2 |
| Radishes | — | — | Apr 5 – May 17 | Aug 26 – Sep 16 |
| Cucumbers | Apr 12 – Apr 19 | May 24 – May 31 | May 17 – May 31 | Jul 22 – Aug 5 |
| Zucchini & Summer Squash | Apr 12 – Apr 19 | — | May 17 – May 31 | Jul 29 – Aug 12 |
| Winter Squash & Pumpkins | Apr 12 – Apr 19 | — | May 17 – May 31 | — |
| Melons & Watermelon | Apr 12 – Apr 19 | May 24 – Jun 7 | — | — |
| Carrots | — | — | Apr 19 – May 17 | Jul 15 – Jul 29 |
| Beets | — | — | Apr 19 – May 17 | Jul 29 – Aug 12 |
| Potatoes | — | — | Apr 19 – May 10 | — |
| Swiss Chard | — | — | Apr 26 – May 24 | Jul 29 – Aug 12 |
| Cilantro | — | — | Apr 26 – May 17 | Aug 12 – Sep 2 |
| Green Beans | — | — | May 17 – Jun 7 | Jul 22 – Aug 5 |
| Sweet Corn | — | — | May 17 – May 31 | — |
| Sweet Potatoes | — | May 24 – Jun 14 | — | — |
| Garlic | — | — | — | Sep 23 – Oct 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 Condon, OR weather station, 22 km away (elevation 2,881 ft (878 m)).
Frost dates near Mikkalo
- Condon May 10 · Oct 7
- Arlington Apr 6 · Oct 21
- Ione Apr 26 · Oct 19
- Lexington Apr 26 · Oct 19
- Moro May 12 · Oct 4
- Wasco May 12 · Oct 4
- Grass Valley May 15 · Oct 11
- Rufus May 19 · Sep 25
- Heppner Apr 26 · Oct 19
- Kent May 15 · Oct 11
Frequently asked questions
When is the last frost in Mikkalo, OR?
The median last spring frost in Mikkalo, OR is May 10. There is still about a 10% chance of frost after May 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mikkalo, OR?
The median first fall frost is October 7, with about a 10% chance of frost before September 21.
How long is the growing season in Mikkalo, OR?
About 150 days between the median last spring frost and first fall frost.
What planting zone is Mikkalo, OR?
Mikkalo, OR is in USDA hardiness zone 7b.