Silverdale, WA planting zone & frost dates
Silverdale is in USDA hardiness zone 8b. The last spring frost usually comes around March 29 and the first fall frost around November 14, for a growing season of about 227 days.
Planting calendar for Silverdale
Dates are counted from the average last spring frost (March 29) 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: Feb 1 – Feb 15 Transplant outdoors: Apr 5 – Apr 12 |
| Peppers | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19 |
| Eggplant | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19 |
| Broccoli | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15 |
| Cabbage | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15 |
| Onions (sets) | Plant outdoors: Mar 1 – Mar 15 |
| Peas | Sow outdoors: Feb 15 – Mar 1 |
| Spinach | Sow outdoors: Feb 15 – Mar 1 |
| Lettuce | Sow outdoors: Mar 1 – Mar 15 |
| Carrots | Sow outdoors: Mar 1 – Mar 15 |
| Potatoes | Plant outdoors: Mar 1 – Mar 15 |
| Beans | Sow outdoors: Apr 5 – Apr 12 |
| Sweet corn | Sow outdoors: Apr 5 – Apr 12 |
| Cucumbers | Sow outdoors: Apr 5 – Apr 12 |
| Squash & zucchini | Sow outdoors: Apr 5 – Apr 12 |
| Basil | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Apr 5 – Apr 12 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 19 (8 weeks before the average first fall frost on Nov 14).
Useful for zone 8b 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 | Mar 5 | Mar 29 | Apr 24 |
| First 32°F frost in fall is before | Dec 1 | Nov 14 | Oct 26 |
How to read it: in spring there is a 10% chance of a frost after April 24, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 26. A hard freeze (28°F) usually ends around February 27.
Hardiness zone by ZIP code in Silverdale
- 98315 zone 8b
- 98383 zone 8b
Nearby cities
- Bremerton zone 9a, last frost Mar 29
- Poulsbo zone 8b, last frost Mar 29
- Port Orchard zone 9a, last frost Mar 29
- Bainbridge Island zone 9a, last frost Mar 29
- Vashon zone 9a, last frost Mar 2
- Artondale zone 9a, last frost Mar 11
- Edmonds zone 9a, last frost Mar 9
- White Center zone 9a, last frost Mar 13
Questions
What growing zone is Silverdale, WA?
Silverdale is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.
When is the last frost in Silverdale?
The average last spring frost (32°F) in Silverdale is March 29. There is still a 10% chance of frost until April 24.
When can I plant tomatoes in Silverdale?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 5 – Apr 12. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Bremerton, WA (USC00450872), 8.5 km (5.3 mi) from the city center, elevation 34 m, based on 26 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.