Klahanie, WA planting zone & frost dates
Klahanie is in USDA hardiness zone 8b. The last spring frost usually comes around March 30 and the first fall frost around November 7, for a growing season of about 223 days.
Planting calendar for Klahanie
Dates are counted from the average last spring frost (March 30) 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 2 – Feb 16 Transplant outdoors: Apr 6 – Apr 13 |
| Peppers | Start seeds indoors: Jan 19 – Feb 2 Transplant outdoors: Apr 13 – Apr 20 |
| Eggplant | Start seeds indoors: Jan 19 – Feb 2 Transplant outdoors: Apr 13 – Apr 20 |
| Broccoli | Start seeds indoors: Jan 19 – Feb 2 Transplant outdoors: Mar 2 – Mar 16 |
| Cabbage | Start seeds indoors: Jan 19 – Feb 2 Transplant outdoors: Mar 2 – Mar 16 |
| Onions (sets) | Plant outdoors: Mar 2 – Mar 16 |
| Peas | Sow outdoors: Feb 16 – Mar 2 |
| Spinach | Sow outdoors: Feb 16 – Mar 2 |
| Lettuce | Sow outdoors: Mar 2 – Mar 16 |
| Carrots | Sow outdoors: Mar 2 – Mar 16 |
| Potatoes | Plant outdoors: Mar 2 – Mar 16 |
| Beans | Sow outdoors: Apr 6 – Apr 13 |
| Sweet corn | Sow outdoors: Apr 6 – Apr 13 |
| Cucumbers | Sow outdoors: Apr 6 – Apr 13 |
| Squash & zucchini | Sow outdoors: Apr 6 – Apr 13 |
| Basil | Start seeds indoors: Feb 16 – Mar 2 Transplant outdoors: Apr 6 – Apr 13 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 12 (8 weeks before the average first fall frost on Nov 7).
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 4 | Mar 30 | Apr 21 |
| First 32°F frost in fall is before | Dec 1 | Nov 7 | Oct 22 |
How to read it: in spring there is a 10% chance of a frost after April 21, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 22. A hard freeze (28°F) usually ends around February 27.
Nearby cities
- City of Sammamish zone 8b, last frost Mar 30
- Issaquah zone 8b, last frost Mar 13
- West Lake Sammamish zone 8b, last frost Mar 13
- Sammamish zone 8b, last frost Mar 8
- Union Hill-Novelty Hill zone 8b, last frost Mar 8
- East Renton Highlands zone 8b, last frost Mar 13
- Newcastle zone 8b, last frost Mar 13
- Redmond zone 9a, last frost Mar 8
Questions
What growing zone is Klahanie, WA?
Klahanie 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 Klahanie?
The average last spring frost (32°F) in Klahanie is March 30. There is still a 10% chance of frost until April 21.
When can I plant tomatoes in Klahanie?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 6 – Apr 13. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Snoqualmie Falls, WA (USC00457773), 13.3 km (8.3 mi) from the city center, elevation 134 m, based on 18 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.