Frost dates for 99302 — Pasco, WA
Last spring frostMar 28median date
First fall frostOct 30median date
Growing season216 daysfrost-free
Hardiness zone7bZone 7b
How Pasco compares
- In 8 years out of 10, the last spring frost in Pasco falls between March 9 and April 10, a 32-day window. The first fall frost falls between October 18 and November 15.
- The median last frost is 24 days earlier than the Washington median of Apr 21.
- Its 216-day growing season is longer than 72% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 8 days earlier 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 76 nights a year at or below 32°F.
- Pasco shares its weather station with Kennewick, WA, 9 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 9 |
| 50% (median) | March 28 |
| 10% (safe for tender plants) | April 10 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 18 |
| 50% (median) | October 30 |
| 90% (late) | November 15 |
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 Pasco, WA
Frost dates for 99302 — Pasco, WA — last frost Mar 28, first frost Oct 30, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 3 to Jan 17Transplant outside: Feb 28 to Mar 14
Start indoors: Jan 17 to Jan 31Transplant outside: Apr 11 to Apr 25
Start indoors: Jan 17 to Jan 31Transplant outside: Apr 11 to Apr 25
Start indoors: Jan 31 to Feb 14Transplant outside: Apr 4 to Apr 18
Start indoors: Jan 31 to Feb 14Transplant outside: Mar 7 to Mar 21Sow outdoors: Feb 28 to Apr 4Plant for fall: Sep 4 to Oct 2
Start indoors: Jan 31 to Feb 14Transplant outside: Feb 28 to Mar 14Sow outdoors: Feb 28 to Mar 14Plant for fall: Aug 21 to Sep 11
Start indoors: Jan 31 to Feb 14Transplant outside: Mar 14 to Mar 28Plant for fall: Jul 24 to Aug 14
Start indoors: Jan 31 to Feb 14Transplant outside: Mar 7 to Mar 21Plant for fall: Jul 24 to Aug 14
Start indoors: Jan 31 to Feb 14Transplant outside: Mar 14 to Mar 28Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 14 to Feb 28Transplant outside: Apr 18 to May 2Sow outdoors: Apr 18 to May 2
Start indoors: Feb 14 to Feb 28Transplant outside: Apr 4 to Apr 18
Sow outdoors: Feb 14 to Mar 7Plant for fall: Aug 7 to Aug 28
Sow outdoors: Feb 14 to Mar 7Plant for fall: Sep 4 to Sep 25
Sow outdoors: Feb 21 to Apr 4Plant for fall: Sep 18 to Oct 9
Start indoors: Feb 28 to Mar 7Transplant outside: Apr 11 to Apr 18Sow outdoors: Apr 4 to Apr 18Plant for fall: Aug 14 to Aug 28
Start indoors: Feb 28 to Mar 7Sow outdoors: Apr 4 to Apr 18Plant for fall: Aug 21 to Sep 4
Start indoors: Feb 28 to Mar 7Sow outdoors: Apr 4 to Apr 18
Start indoors: Feb 28 to Mar 7Transplant outside: Apr 11 to Apr 25
Sow outdoors: Mar 7 to Apr 4Plant for fall: Aug 7 to Aug 21
Sow outdoors: Mar 7 to Apr 4Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 7 to Mar 28
Sow outdoors: Mar 14 to Apr 11Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 14 to Apr 4Plant for fall: Sep 4 to Sep 25
Sow outdoors: Apr 4 to Apr 25Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 4 to Apr 18
Transplant outside: Apr 11 to May 2
Plant for fall: Oct 16 to Nov 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pasco, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 3 – Jan 17 | Feb 28 – Mar 14 | — | — |
| Peppers | Jan 17 – Jan 31 | Apr 11 – Apr 25 | — | — |
| Eggplant | Jan 17 – Jan 31 | Apr 11 – Apr 25 | — | — |
| Tomatoes | Jan 31 – Feb 14 | Apr 4 – Apr 18 | — | — |
| Lettuce | Jan 31 – Feb 14 | Mar 7 – Mar 21 | Feb 28 – Apr 4 | Sep 4 – Oct 2 |
| Kale | Jan 31 – Feb 14 | Feb 28 – Mar 14 | Feb 28 – Mar 14 | Aug 21 – Sep 11 |
| Broccoli | Jan 31 – Feb 14 | Mar 14 – Mar 28 | — | Jul 24 – Aug 14 |
| Cabbage | Jan 31 – Feb 14 | Mar 7 – Mar 21 | — | Jul 24 – Aug 14 |
| Cauliflower | Jan 31 – Feb 14 | Mar 14 – Mar 28 | — | Jul 24 – Aug 14 |
| Okra | Feb 14 – Feb 28 | Apr 18 – May 2 | Apr 18 – May 2 | — |
| Basil | Feb 14 – Feb 28 | Apr 4 – Apr 18 | — | — |
| Peas | — | — | Feb 14 – Mar 7 | Aug 7 – Aug 28 |
| Spinach | — | — | Feb 14 – Mar 7 | Sep 4 – Sep 25 |
| Radishes | — | — | Feb 21 – Apr 4 | Sep 18 – Oct 9 |
| Cucumbers | Feb 28 – Mar 7 | Apr 11 – Apr 18 | Apr 4 – Apr 18 | Aug 14 – Aug 28 |
| Zucchini & Summer Squash | Feb 28 – Mar 7 | — | Apr 4 – Apr 18 | Aug 21 – Sep 4 |
| Winter Squash & Pumpkins | Feb 28 – Mar 7 | — | Apr 4 – Apr 18 | — |
| Melons & Watermelon | Feb 28 – Mar 7 | Apr 11 – Apr 25 | — | — |
| Carrots | — | — | Mar 7 – Apr 4 | Aug 7 – Aug 21 |
| Beets | — | — | Mar 7 – Apr 4 | Aug 21 – Sep 4 |
| Potatoes | — | — | Mar 7 – Mar 28 | — |
| Swiss Chard | — | — | Mar 14 – Apr 11 | Aug 21 – Sep 4 |
| Cilantro | — | — | Mar 14 – Apr 4 | Sep 4 – Sep 25 |
| Green Beans | — | — | Apr 4 – Apr 25 | Aug 14 – Aug 28 |
| Sweet Corn | — | — | Apr 4 – Apr 18 | — |
| Sweet Potatoes | — | Apr 11 – May 2 | — | — |
| Garlic | — | — | — | Oct 16 – Nov 20 |
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 Kennewick, WA weather station, 3 km away (elevation 390 ft (119 m)).
ZIP codes in Pasco: 99301 99302
Frost dates near Pasco
- Kennewick Mar 28 · Oct 30
- Burbank Apr 7 · Oct 22
- Richland Apr 6 · Oct 24
- Wallula Apr 7 · Oct 22
- West Richland Apr 6 · Oct 24
- Eltopia Apr 30 · Oct 13
- Benton City Apr 6 · Oct 24
- Touchet May 2 · Oct 1
Frequently asked questions
When is the last frost in Pasco, WA?
The median last spring frost in Pasco, WA is March 28. There is still about a 10% chance of frost after April 10, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pasco, WA?
The median first fall frost is October 30, with about a 10% chance of frost before October 18.
How long is the growing season in Pasco, WA?
About 216 days between the median last spring frost and first fall frost.
What planting zone is Pasco, WA?
Pasco, WA is in USDA hardiness zone 7b.