Mesa, WA frost dates
Last spring frostApr 21median date
First fall frostOct 22median date
Growing season184 daysfrost-free
Hardiness zone7aZone 7a
How Mesa compares
- In 8 years out of 10, the last spring frost in Mesa falls between April 3 and May 6, a 33-day window. The first fall frost falls between October 7 and November 4.
- The median last frost is the same as the Washington median of Apr 21.
- Its 184-day growing season is longer than 52% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 5 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 105 nights a year at or below 32°F.
- Compared with Richland, WA, 34 km away, the last frost here is 15 days later than there and the growing season is 17 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 3 |
| 50% (median) | April 21 |
| 10% (safe for tender plants) | May 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 7 |
| 50% (median) | October 22 |
| 90% (late) | November 4 |
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 Mesa, WA
Mesa, WA frost dates — last frost Apr 21, first frost Oct 22, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 27 to Feb 10Transplant outside: Mar 24 to Apr 7
Start indoors: Feb 10 to Feb 24Transplant outside: May 5 to May 19
Start indoors: Feb 10 to Feb 24Transplant outside: May 5 to May 19
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 28 to May 12
Start indoors: Feb 24 to Mar 10Transplant outside: Mar 31 to Apr 14Sow outdoors: Mar 24 to Apr 28Plant for fall: Aug 27 to Sep 24
Start indoors: Feb 24 to Mar 10Transplant outside: Mar 24 to Apr 7Sow outdoors: Mar 24 to Apr 7Plant for fall: Aug 13 to Sep 3
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 7 to Apr 21Plant for fall: Jul 16 to Aug 6
Start indoors: Feb 24 to Mar 10Transplant outside: Mar 31 to Apr 14Plant for fall: Jul 16 to Aug 6
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 7 to Apr 21Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 10 to Mar 24Transplant outside: May 12 to May 26Sow outdoors: May 12 to May 26
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 28 to May 12
Sow outdoors: Mar 10 to Mar 31Plant for fall: Jul 30 to Aug 20
Sow outdoors: Mar 10 to Mar 31Plant for fall: Aug 27 to Sep 17
Sow outdoors: Mar 17 to Apr 28Plant for fall: Sep 10 to Oct 1
Start indoors: Mar 24 to Mar 31Transplant outside: May 5 to May 12Sow outdoors: Apr 28 to May 12Plant for fall: Aug 6 to Aug 20
Start indoors: Mar 24 to Mar 31Sow outdoors: Apr 28 to May 12Plant for fall: Aug 13 to Aug 27
Start indoors: Mar 24 to Mar 31Sow outdoors: Apr 28 to May 12
Start indoors: Mar 24 to Mar 31Transplant outside: May 5 to May 19
Sow outdoors: Mar 31 to Apr 28Plant for fall: Jul 30 to Aug 13
Sow outdoors: Mar 31 to Apr 28Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 31 to Apr 21
Sow outdoors: Apr 7 to May 5Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 7 to Apr 28Plant for fall: Aug 27 to Sep 17
Sow outdoors: Apr 28 to May 19Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 28 to May 12
Transplant outside: May 5 to May 26
Plant for fall: Oct 8 to Nov 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mesa, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 27 – Feb 10 | Mar 24 – Apr 7 | — | — |
| Peppers | Feb 10 – Feb 24 | May 5 – May 19 | — | — |
| Eggplant | Feb 10 – Feb 24 | May 5 – May 19 | — | — |
| Tomatoes | Feb 24 – Mar 10 | Apr 28 – May 12 | — | — |
| Lettuce | Feb 24 – Mar 10 | Mar 31 – Apr 14 | Mar 24 – Apr 28 | Aug 27 – Sep 24 |
| Kale | Feb 24 – Mar 10 | Mar 24 – Apr 7 | Mar 24 – Apr 7 | Aug 13 – Sep 3 |
| Broccoli | Feb 24 – Mar 10 | Apr 7 – Apr 21 | — | Jul 16 – Aug 6 |
| Cabbage | Feb 24 – Mar 10 | Mar 31 – Apr 14 | — | Jul 16 – Aug 6 |
| Cauliflower | Feb 24 – Mar 10 | Apr 7 – Apr 21 | — | Jul 16 – Aug 6 |
| Okra | Mar 10 – Mar 24 | May 12 – May 26 | May 12 – May 26 | — |
| Basil | Mar 10 – Mar 24 | Apr 28 – May 12 | — | — |
| Peas | — | — | Mar 10 – Mar 31 | Jul 30 – Aug 20 |
| Spinach | — | — | Mar 10 – Mar 31 | Aug 27 – Sep 17 |
| Radishes | — | — | Mar 17 – Apr 28 | Sep 10 – Oct 1 |
| Cucumbers | Mar 24 – Mar 31 | May 5 – May 12 | Apr 28 – May 12 | Aug 6 – Aug 20 |
| Zucchini & Summer Squash | Mar 24 – Mar 31 | — | Apr 28 – May 12 | Aug 13 – Aug 27 |
| Winter Squash & Pumpkins | Mar 24 – Mar 31 | — | Apr 28 – May 12 | — |
| Melons & Watermelon | Mar 24 – Mar 31 | May 5 – May 19 | — | — |
| Carrots | — | — | Mar 31 – Apr 28 | Jul 30 – Aug 13 |
| Beets | — | — | Mar 31 – Apr 28 | Aug 13 – Aug 27 |
| Potatoes | — | — | Mar 31 – Apr 21 | — |
| Swiss Chard | — | — | Apr 7 – May 5 | Aug 13 – Aug 27 |
| Cilantro | — | — | Apr 7 – Apr 28 | Aug 27 – Sep 17 |
| Green Beans | — | — | Apr 28 – May 19 | Aug 6 – Aug 20 |
| Sweet Corn | — | — | Apr 28 – May 12 | — |
| Sweet Potatoes | — | May 5 – May 26 | — | — |
| 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 Eltopia 8 Wsw, WA weather station, 20 km away (elevation 699 ft (213 m)).
Frost dates near Mesa
- Eltopia Apr 30 · Oct 13
- Connell Apr 30 · Oct 12
- Othello Apr 30 · Oct 12
- West Richland Apr 6 · Oct 24
- Richland Apr 6 · Oct 24
- Pasco Apr 27 · Oct 11
- Benton City Apr 6 · Oct 24
- Kennewick Mar 28 · Oct 30
- Warden Apr 27 · Oct 8
- Burbank Apr 7 · Oct 22
Frequently asked questions
When is the last frost in Mesa, WA?
The median last spring frost in Mesa, WA is April 21. There is still about a 10% chance of frost after May 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mesa, WA?
The median first fall frost is October 22, with about a 10% chance of frost before October 7.
How long is the growing season in Mesa, WA?
About 184 days between the median last spring frost and first fall frost.
What planting zone is Mesa, WA?
Mesa, WA is in USDA hardiness zone 7a.