Frost dates for 99352 — Richland, WA
Last spring frostApr 6median date
First fall frostOct 24median date
Growing season201 daysfrost-free
Hardiness zone7bZone 7b
How Richland compares
- In 8 years out of 10, the last spring frost in Richland falls between March 22 and April 24, a 33-day window. The first fall frost falls between October 10 and November 8.
- The median last frost is 15 days earlier than the Washington median of Apr 21.
- Its 201-day growing season is longer than 61% 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 91 nights a year at or below 32°F.
- Compared with Kennewick, WA, 11 km away, the last frost here is 9 days later than there and the growing season is 15 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 22 |
| 50% (median) | April 6 |
| 10% (safe for tender plants) | April 24 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 10 |
| 50% (median) | October 24 |
| 90% (late) | November 8 |
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 Richland, WA
Frost dates for 99352 — Richland, WA — last frost Apr 6, first frost Oct 24, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 12 to Jan 26Transplant outside: Mar 9 to Mar 23
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Feb 9 to Feb 23Transplant outside: Apr 13 to Apr 27
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 9 to Apr 13Plant for fall: Aug 29 to Sep 26
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 9 to Mar 23Sow outdoors: Mar 9 to Mar 23Plant for fall: Aug 15 to Sep 5
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 13 to Apr 27
Sow outdoors: Feb 23 to Mar 16Plant for fall: Aug 1 to Aug 22
Sow outdoors: Feb 23 to Mar 16Plant for fall: Aug 29 to Sep 19
Sow outdoors: Mar 2 to Apr 13Plant for fall: Sep 12 to Oct 3
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 15 to Aug 29
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 1 to Aug 15
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 16 to Apr 6
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 23 to Apr 13Plant for fall: Aug 29 to Sep 19
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 13 to Apr 27
Transplant outside: Apr 20 to May 11
Plant for fall: Oct 10 to Nov 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Richland, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 12 – Jan 26 | Mar 9 – Mar 23 | — | — |
| Peppers | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Eggplant | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Tomatoes | Feb 9 – Feb 23 | Apr 13 – Apr 27 | — | — |
| Lettuce | Feb 9 – Feb 23 | Mar 16 – Mar 30 | Mar 9 – Apr 13 | Aug 29 – Sep 26 |
| Kale | Feb 9 – Feb 23 | Mar 9 – Mar 23 | Mar 9 – Mar 23 | Aug 15 – Sep 5 |
| Broccoli | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Jul 18 – Aug 8 |
| Cabbage | Feb 9 – Feb 23 | Mar 16 – Mar 30 | — | Jul 18 – Aug 8 |
| Cauliflower | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Jul 18 – Aug 8 |
| Okra | Feb 23 – Mar 9 | Apr 27 – May 11 | Apr 27 – May 11 | — |
| Basil | Feb 23 – Mar 9 | Apr 13 – Apr 27 | — | — |
| Peas | — | — | Feb 23 – Mar 16 | Aug 1 – Aug 22 |
| Spinach | — | — | Feb 23 – Mar 16 | Aug 29 – Sep 19 |
| Radishes | — | — | Mar 2 – Apr 13 | Sep 12 – Oct 3 |
| Cucumbers | Mar 9 – Mar 16 | Apr 20 – Apr 27 | Apr 13 – Apr 27 | Aug 8 – Aug 22 |
| Zucchini & Summer Squash | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | Aug 15 – Aug 29 |
| Winter Squash & Pumpkins | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | — |
| Melons & Watermelon | Mar 9 – Mar 16 | Apr 20 – May 4 | — | — |
| Carrots | — | — | Mar 16 – Apr 13 | Aug 1 – Aug 15 |
| Beets | — | — | Mar 16 – Apr 13 | Aug 15 – Aug 29 |
| Potatoes | — | — | Mar 16 – Apr 6 | — |
| Swiss Chard | — | — | Mar 23 – Apr 20 | Aug 15 – Aug 29 |
| Cilantro | — | — | Mar 23 – Apr 13 | Aug 29 – Sep 19 |
| Green Beans | — | — | Apr 13 – May 4 | Aug 8 – Aug 22 |
| Sweet Corn | — | — | Apr 13 – Apr 27 | — |
| Sweet Potatoes | — | Apr 20 – May 11 | — | — |
| Garlic | — | — | — | Oct 10 – Nov 14 |
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 Richland, WA weather station, 7 km away (elevation 374 ft (114 m)).
ZIP codes in Richland: 99352 99354
Frost dates near Richland
- West Richland Apr 6 · Oct 24
- Kennewick Mar 28 · Oct 30
- Pasco Apr 27 · Oct 11
- Benton City Apr 6 · Oct 24
- Eltopia Apr 30 · Oct 13
- Burbank Apr 7 · Oct 22
- Wallula Apr 7 · Oct 22
- Plymouth Mar 27 · Nov 4
Frequently asked questions
When is the last frost in Richland, WA?
The median last spring frost in Richland, WA is April 6. There is still about a 10% chance of frost after April 24, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Richland, WA?
The median first fall frost is October 24, with about a 10% chance of frost before October 10.
How long is the growing season in Richland, WA?
About 201 days between the median last spring frost and first fall frost.
What planting zone is Richland, WA?
Richland, WA is in USDA hardiness zone 7b.