Sunnyside, WA frost dates
Last spring frostMay 1median date
First fall frostOct 6median date
Growing season158 daysfrost-free
Hardiness zone7bZone 7b
How Sunnyside compares
- In 8 years out of 10, the last spring frost in Sunnyside falls between April 16 and May 18, a 32-day window. The first fall frost falls between September 25 and October 22.
- The median last frost is 10 days later than the Washington median of Apr 21.
- Its 158-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 26 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 124 nights a year at or below 32°F.
- Compared with Yakima, WA, 55 km away, the last frost here is 23 days later than there and the growing season is 40 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 16 |
| 50% (median) | May 1 |
| 10% (safe for tender plants) | May 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 25 |
| 50% (median) | October 6 |
| 90% (late) | October 22 |
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 Sunnyside, WA
Sunnyside, WA frost dates — last frost May 1, first frost Oct 6, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Feb 6 to Feb 20Transplant outside: Apr 3 to Apr 17
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Mar 6 to Mar 20Transplant outside: May 8 to May 22
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 3 to May 8Plant for fall: Aug 11 to Sep 8
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 3 to Apr 17Sow outdoors: Apr 3 to Apr 17Plant for fall: Jul 28 to Aug 18
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 20 to Apr 3Transplant outside: May 22 to Jun 5Sow outdoors: May 22 to Jun 5
Start indoors: Mar 20 to Apr 3Transplant outside: May 8 to May 22
Sow outdoors: Mar 20 to Apr 10Plant for fall: Jul 14 to Aug 4
Sow outdoors: Mar 20 to Apr 10Plant for fall: Aug 11 to Sep 1
Sow outdoors: Mar 27 to May 8Plant for fall: Aug 25 to Sep 15
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 29
Sow outdoors: Apr 10 to May 8Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 10 to May 8Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 10 to May 1
Sow outdoors: Apr 17 to May 15Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 17 to May 8Plant for fall: Aug 11 to Sep 1
Sow outdoors: May 8 to May 29Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 8 to May 22
Transplant outside: May 15 to Jun 5
Plant for fall: Sep 22 to Oct 27
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sunnyside, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 6 – Feb 20 | Apr 3 – Apr 17 | — | — |
| Peppers | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Eggplant | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Tomatoes | Mar 6 – Mar 20 | May 8 – May 22 | — | — |
| Lettuce | Mar 6 – Mar 20 | Apr 10 – Apr 24 | Apr 3 – May 8 | Aug 11 – Sep 8 |
| Kale | Mar 6 – Mar 20 | Apr 3 – Apr 17 | Apr 3 – Apr 17 | Jul 28 – Aug 18 |
| Broccoli | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jun 30 – Jul 21 |
| Cabbage | Mar 6 – Mar 20 | Apr 10 – Apr 24 | — | Jun 30 – Jul 21 |
| Cauliflower | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jun 30 – Jul 21 |
| Okra | Mar 20 – Apr 3 | May 22 – Jun 5 | May 22 – Jun 5 | — |
| Basil | Mar 20 – Apr 3 | May 8 – May 22 | — | — |
| Peas | — | — | Mar 20 – Apr 10 | Jul 14 – Aug 4 |
| Spinach | — | — | Mar 20 – Apr 10 | Aug 11 – Sep 1 |
| Radishes | — | — | Mar 27 – May 8 | Aug 25 – Sep 15 |
| Cucumbers | Apr 3 – Apr 10 | May 15 – May 22 | May 8 – May 22 | Jul 21 – Aug 4 |
| Zucchini & Summer Squash | Apr 3 – Apr 10 | — | May 8 – May 22 | Jul 28 – Aug 11 |
| Winter Squash & Pumpkins | Apr 3 – Apr 10 | — | May 8 – May 22 | — |
| Melons & Watermelon | Apr 3 – Apr 10 | May 15 – May 29 | — | — |
| Carrots | — | — | Apr 10 – May 8 | Jul 14 – Jul 28 |
| Beets | — | — | Apr 10 – May 8 | Jul 28 – Aug 11 |
| Potatoes | — | — | Apr 10 – May 1 | — |
| Swiss Chard | — | — | Apr 17 – May 15 | Jul 28 – Aug 11 |
| Cilantro | — | — | Apr 17 – May 8 | Aug 11 – Sep 1 |
| Green Beans | — | — | May 8 – May 29 | Jul 21 – Aug 4 |
| Sweet Corn | — | — | May 8 – May 22 | — |
| Sweet Potatoes | — | May 15 – Jun 5 | — | — |
| Garlic | — | — | — | Sep 22 – Oct 27 |
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 Sunnyside, WA weather station, about 1 km away (elevation 748 ft (228 m)).
Frost dates near Sunnyside
- Outlook Apr 30 · Oct 8
- Grandview May 1 · Oct 6
- Mabton May 1 · Oct 6
- Granger Apr 30 · Oct 8
- Prosser Apr 14 · Oct 22
- Zillah Apr 21 · Oct 15
- Toppenish Apr 21 · Oct 15
- Buena Apr 21 · Oct 15
- Wapato Apr 21 · Oct 15
- Moxee May 8 · Oct 4
Frequently asked questions
When is the last frost in Sunnyside, WA?
The median last spring frost in Sunnyside, WA is May 1. There is still about a 10% chance of frost after May 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sunnyside, WA?
The median first fall frost is October 6, with about a 10% chance of frost before September 25.
How long is the growing season in Sunnyside, WA?
About 158 days between the median last spring frost and first fall frost.
What planting zone is Sunnyside, WA?
Sunnyside, WA is in USDA hardiness zone 7b.