Seattle, Washington falls into USDA plant hardiness zones 9a (20°F to 25°F/-6.7°C to -3.9°C) and 9b (25°F to 30°F/-3.9°C to -1.1°C) according to Latest 2023 USDA data. Zone 9a covers most of the city, while 9b forms a narrow interior corridor. These zones reflect the region’s mild, maritime climate influenced by the Pacific Ocean and Puget Sound.
You can pinpoint your Seattle USDA zone using our three tools given below, Zipcode to planting zone tool, Easy interactive map or by using planting zone table.
Seattle Planting Zones by ZipCode
Planting Zones Seattle Map
Select or type your Seattle location in the selection box below. Use the layer button to on/off layers, top right corner button in mapview.
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Seattle Area Planting Zone
Planting Zones
Planting Zones
Seattle Planting Zones Table
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Planting zones in Seattle, Washington
1. Zone 9a
Zone 9a, light green colored areas on our map given above, covers most of Seattle and surroundings. Average annual minimum temperatures: 20°F to 25°F (-6.7°C to -3.9°C). This zone includes downtown and many neighborhoods.
Some areas in it are Downtown (98101), Capitol Hill (98102), Wallingford/Fremont (98103), Pioneer Square/International District (98104), University District (98105), and other zip codes covering the bulk of Seattle proper.
2. Zone 9b
Zone 9b, yellow colored areas on our map, narrow strip running north-south through the central part of Seattle. With average annual minimum temperatures: 25°F to 30°F (-3.9°C to -1.1°C), it covers significant area of central Seattle, including parts of downtown and nearby neighborhoods.
The Proximity to Puget Sound and Pacific Ocean creates a relatively mild climate for Seattle (Washington) suitable for a wide range of plants.
Best plants for Seattle?
Seattle’s USDA growing zones 9a and 9b support plants like:
- Vegetables: Tomatoes, peppers, squash, beans, peas, lettuce, kale, and carrots.
- Fruits: Apples, pears, plums, cherries, blueberries, and strawberries.
- Herbs: Rosemary, thyme, oregano, sage, and lavender.
- Ornamentals: Rhododendrons, azaleas, camellias, hydrangeas, and Japanese maples.
- Perennials: Hostas, ferns, heucheras, and astilbes.
Growing season for Seattle?
Seattle’s growing season typically lasts from late March to mid-November, spanning approximately 238 days. The last frost date is usually around March 24, while the first frost date falls around November 17. This long growing season allows for multiple plantings of cool-season crops and ample time for warm-season vegetables to mature.