Wallula, WA frost dates
Last spring frostApr 7median date
First fall frostOct 22median date
Growing season198 daysfrost-free
Hardiness zone7bZone 7b
How Wallula compares
- In 8 years out of 10, the last spring frost in Wallula falls between March 20 and April 30, a 41-day window. The first fall frost falls between October 6 and November 9.
- The median last frost is 14 days earlier than the Washington median of Apr 21.
- Its 198-day growing season is longer than 58% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is typical for zone 7b, where the median is Apr 5.
- The weather station records an average of 84 nights a year at or below 32°F.
- Compared with Pasco, WA, 23 km away, the last frost here is 20 days earlier than there and the growing season is 31 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 20 |
| 50% (median) | April 7 |
| 10% (safe for tender plants) | April 30 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 6 |
| 50% (median) | October 22 |
| 90% (late) | November 9 |
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 Wallula, WA
Wallula, WA frost dates — last frost Apr 7, first frost Oct 22, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 13 to Jan 27Transplant outside: Mar 10 to Mar 24
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Feb 10 to Feb 24Transplant outside: Apr 14 to Apr 28
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Sow outdoors: Mar 10 to Apr 14Plant for fall: Aug 27 to Sep 24
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 10 to Mar 24Plant for fall: Aug 13 to Sep 3
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Jul 16 to Aug 6
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Plant for fall: Jul 16 to Aug 6
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Jul 16 to Aug 6
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 28 to May 12Sow outdoors: Apr 28 to May 12
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 14 to Apr 28
Sow outdoors: Feb 24 to Mar 17Plant for fall: Jul 30 to Aug 20
Sow outdoors: Feb 24 to Mar 17Plant for fall: Aug 27 to Sep 17
Sow outdoors: Mar 3 to Apr 14Plant for fall: Sep 10 to Oct 1
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Aug 6 to Aug 20
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28Plant for fall: Aug 13 to Aug 27
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to May 5
Sow outdoors: Mar 17 to Apr 14Plant for fall: Jul 30 to Aug 13
Sow outdoors: Mar 17 to Apr 14Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 17 to Apr 7
Sow outdoors: Mar 24 to Apr 21Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 24 to Apr 14Plant for fall: Aug 27 to Sep 17
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 14 to Apr 28
Transplant outside: Apr 21 to May 12
Plant for fall: Oct 8 to Nov 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wallula, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 13 – Jan 27 | Mar 10 – Mar 24 | — | — |
| Peppers | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Eggplant | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Tomatoes | Feb 10 – Feb 24 | Apr 14 – Apr 28 | — | — |
| Lettuce | Feb 10 – Feb 24 | Mar 17 – Mar 31 | Mar 10 – Apr 14 | Aug 27 – Sep 24 |
| Kale | Feb 10 – Feb 24 | Mar 10 – Mar 24 | Mar 10 – Mar 24 | Aug 13 – Sep 3 |
| Broccoli | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Jul 16 – Aug 6 |
| Cabbage | Feb 10 – Feb 24 | Mar 17 – Mar 31 | — | Jul 16 – Aug 6 |
| Cauliflower | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Jul 16 – Aug 6 |
| Okra | Feb 24 – Mar 10 | Apr 28 – May 12 | Apr 28 – May 12 | — |
| Basil | Feb 24 – Mar 10 | Apr 14 – Apr 28 | — | — |
| Peas | — | — | Feb 24 – Mar 17 | Jul 30 – Aug 20 |
| Spinach | — | — | Feb 24 – Mar 17 | Aug 27 – Sep 17 |
| Radishes | — | — | Mar 3 – Apr 14 | Sep 10 – Oct 1 |
| Cucumbers | Mar 10 – Mar 17 | Apr 21 – Apr 28 | Apr 14 – Apr 28 | Aug 6 – Aug 20 |
| Zucchini & Summer Squash | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | Aug 13 – Aug 27 |
| Winter Squash & Pumpkins | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | — |
| Melons & Watermelon | Mar 10 – Mar 17 | Apr 21 – May 5 | — | — |
| Carrots | — | — | Mar 17 – Apr 14 | Jul 30 – Aug 13 |
| Beets | — | — | Mar 17 – Apr 14 | Aug 13 – Aug 27 |
| Potatoes | — | — | Mar 17 – Apr 7 | — |
| Swiss Chard | — | — | Mar 24 – Apr 21 | Aug 13 – Aug 27 |
| Cilantro | — | — | Mar 24 – Apr 14 | Aug 27 – Sep 17 |
| Green Beans | — | — | Apr 14 – May 5 | Aug 6 – Aug 20 |
| Sweet Corn | — | — | Apr 14 – Apr 28 | — |
| Sweet Potatoes | — | Apr 21 – May 12 | — | — |
| Garlic | — | — | — | Oct 8 – Nov 12 |
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 Ice Harbor Dam, WA weather station, 18 km away (elevation 367 ft (112 m)).
Frost dates near Wallula
- Burbank Apr 7 · Oct 22
- Touchet May 2 · Oct 1
- Pasco Apr 27 · Oct 11
- Kennewick Mar 28 · Oct 30
- Richland Apr 6 · Oct 24
- College Place May 2 · Oct 1
- Plymouth Mar 27 · Nov 4
- West Richland Apr 6 · Oct 24
- Walla Walla Mar 27 · Oct 31
- Eltopia Apr 30 · Oct 13
Frequently asked questions
When is the last frost in Wallula, WA?
The median last spring frost in Wallula, WA is April 7. There is still about a 10% chance of frost after April 30, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wallula, WA?
The median first fall frost is October 22, with about a 10% chance of frost before October 6.
How long is the growing season in Wallula, WA?
About 198 days between the median last spring frost and first fall frost.
What planting zone is Wallula, WA?
Wallula, WA is in USDA hardiness zone 7b.