Pomeroy, WA frost dates
Last spring frostMay 2median date
First fall frostOct 4median date
Growing season155 daysfrost-free
Hardiness zone7aZone 7a
How Pomeroy compares
- In 8 years out of 10, the last spring frost in Pomeroy falls between April 15 and May 19, a 34-day window. The first fall frost falls between September 17 and October 24.
- The median last frost is 11 days later than the Washington median of Apr 21.
- Its 155-day growing season is longer than 23% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 16 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 125 nights a year at or below 32°F.
- Compared with Pasco, WA, 118 km away, the last frost here is 5 days later than there and the growing season is 12 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 15 |
| 50% (median) | May 2 |
| 10% (safe for tender plants) | May 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 17 |
| 50% (median) | October 4 |
| 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 Pomeroy, WA
Pomeroy, WA frost dates — last frost May 2, first frost Oct 4, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Feb 7 to Feb 21Transplant outside: Apr 4 to Apr 18
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 4 to May 9Plant for fall: Aug 9 to Sep 6
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 4 to Apr 18Sow outdoors: Apr 4 to Apr 18Plant for fall: Jul 26 to Aug 16
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6Sow outdoors: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Mar 21 to Apr 11Plant for fall: Jul 12 to Aug 2
Sow outdoors: Mar 21 to Apr 11Plant for fall: Aug 9 to Aug 30
Sow outdoors: Mar 28 to May 9Plant for fall: Aug 23 to Sep 13
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23Plant for fall: Jul 26 to Aug 9
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 12 to Jul 26
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 26 to Aug 9
Sow outdoors: Apr 11 to May 2
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 26 to Aug 9
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 9 to Aug 30
Sow outdoors: May 9 to May 30Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 9 to May 23
Transplant outside: May 16 to Jun 6
Plant for fall: Sep 20 to Oct 25
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pomeroy, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 7 – Feb 21 | Apr 4 – Apr 18 | — | — |
| Peppers | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Eggplant | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Tomatoes | Mar 7 – Mar 21 | May 9 – May 23 | — | — |
| Lettuce | Mar 7 – Mar 21 | Apr 11 – Apr 25 | Apr 4 – May 9 | Aug 9 – Sep 6 |
| Kale | Mar 7 – Mar 21 | Apr 4 – Apr 18 | Apr 4 – Apr 18 | Jul 26 – Aug 16 |
| Broccoli | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jun 28 – Jul 19 |
| Cabbage | Mar 7 – Mar 21 | Apr 11 – Apr 25 | — | Jun 28 – Jul 19 |
| Cauliflower | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jun 28 – Jul 19 |
| Okra | Mar 21 – Apr 4 | May 23 – Jun 6 | May 23 – Jun 6 | — |
| Basil | Mar 21 – Apr 4 | May 9 – May 23 | — | — |
| Peas | — | — | Mar 21 – Apr 11 | Jul 12 – Aug 2 |
| Spinach | — | — | Mar 21 – Apr 11 | Aug 9 – Aug 30 |
| Radishes | — | — | Mar 28 – May 9 | Aug 23 – Sep 13 |
| Cucumbers | Apr 4 – Apr 11 | May 16 – May 23 | May 9 – May 23 | Jul 19 – Aug 2 |
| Zucchini & Summer Squash | Apr 4 – Apr 11 | — | May 9 – May 23 | Jul 26 – Aug 9 |
| Winter Squash & Pumpkins | Apr 4 – Apr 11 | — | May 9 – May 23 | — |
| Melons & Watermelon | Apr 4 – Apr 11 | May 16 – May 30 | — | — |
| Carrots | — | — | Apr 11 – May 9 | Jul 12 – Jul 26 |
| Beets | — | — | Apr 11 – May 9 | Jul 26 – Aug 9 |
| Potatoes | — | — | Apr 11 – May 2 | — |
| Swiss Chard | — | — | Apr 18 – May 16 | Jul 26 – Aug 9 |
| Cilantro | — | — | Apr 18 – May 9 | Aug 9 – Aug 30 |
| Green Beans | — | — | May 9 – May 30 | Jul 19 – Aug 2 |
| Sweet Corn | — | — | May 9 – May 23 | — |
| Sweet Potatoes | — | May 16 – Jun 6 | — | — |
| 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 Pomeroy, WA weather station, about 1 km away (elevation 1,936 ft (590 m)).
Frost dates near Pomeroy
- Dayton Apr 28 · Oct 13
- Colton Apr 29 · Oct 2
- Lacrosse May 13 · Sep 26
- Hay May 13 · Sep 26
- Starbuck Apr 28 · Oct 13
- Uniontown Apr 6 · Oct 26
- Clarkston Apr 6 · Oct 26
- Pullman May 6 · Sep 29
- Albion May 6 · Sep 29
- Waitsburg Apr 28 · Oct 13
Frequently asked questions
When is the last frost in Pomeroy, WA?
The median last spring frost in Pomeroy, WA is May 2. There is still about a 10% chance of frost after May 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pomeroy, WA?
The median first fall frost is October 4, with about a 10% chance of frost before September 17.
How long is the growing season in Pomeroy, WA?
About 155 days between the median last spring frost and first fall frost.
What planting zone is Pomeroy, WA?
Pomeroy, WA is in USDA hardiness zone 7a.