Spokane Valley, WA planting zone & frost dates
Spokane Valley is in USDA hardiness zone 7a. The last spring frost usually comes around April 26 and the first fall frost around October 15, for a growing season of about 170 days.
Planting calendar for Spokane Valley
Dates are counted from the average last spring frost (April 26) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 1 – Mar 15 Transplant outdoors: May 3 – May 10 |
| Peppers | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: May 10 – May 17 |
| Eggplant | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: May 10 – May 17 |
| Broccoli | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Mar 29 – Apr 12 |
| Cabbage | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Mar 29 – Apr 12 |
| Onions (sets) | Plant outdoors: Mar 29 – Apr 12 |
| Peas | Sow outdoors: Mar 15 – Mar 29 |
| Spinach | Sow outdoors: Mar 15 – Mar 29 |
| Lettuce | Sow outdoors: Mar 29 – Apr 12 |
| Carrots | Sow outdoors: Mar 29 – Apr 12 |
| Potatoes | Plant outdoors: Mar 29 – Apr 12 |
| Beans | Sow outdoors: May 3 – May 10 |
| Sweet corn | Sow outdoors: May 3 – May 10 |
| Cucumbers | Sow outdoors: May 3 – May 10 |
| Squash & zucchini | Sow outdoors: May 3 – May 10 |
| Basil | Start seeds indoors: Mar 15 – Mar 29 Transplant outdoors: May 3 – May 10 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 20 (8 weeks before the average first fall frost on Oct 15).
Useful for zone 7a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 10 | Apr 26 | May 10 |
| First 32°F frost in fall is before | Oct 31 | Oct 15 | Sep 30 |
How to read it: in spring there is a 10% chance of a frost after May 10, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 30. A hard freeze (28°F) usually ends around April 4.
Nearby cities
- Spokane zone 7a, last frost Apr 26
- Cheney zone 6b, last frost May 30
- Pullman zone 6b, last frost May 6
- Walla Walla zone 7a, last frost Mar 27
- Moses Lake zone 7a, last frost Apr 27
- Pasco zone 7b, last frost Mar 28
- Kennewick zone 7b, last frost Mar 28
- Richland zone 7b, last frost Apr 6
Questions
What growing zone is Spokane Valley, WA?
Spokane Valley is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Spokane Valley?
The average last spring frost (32°F) in Spokane Valley is April 26. There is still a 10% chance of frost until May 10.
When can I plant tomatoes in Spokane Valley?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 3 – May 10. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Spokane Felts Fld, WA (USW00094176), 6.2 km (3.9 mi) from the city center, elevation 595 m, based on 22 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.