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City guide · Zone 9a

What to plant in Seattle, Washington

A full-sun bed in Seattle: Gardenia 'Frostproof', Pink muhly grass, Foxglove beardtongue 'Husker Red', Threadleaf coreopsis 'Moonbeam', Angelina stonecrop 'Angelina'. Zone 9a, last frost around Mar 10.

Wet, mild winters and dry summers. Plants that like moisture need summer watering.

Preview: plant data is awaiting horticulturist review. A professional horticulturist hasn't reviewed our plant table yet. Lists still follow fixed rules for zone, sun, pets, deer and invasive status.

Seattle, Washington at a glance

Hardiness zone (2023 USDA)
9a (ZIP 98101)
Typical last spring frost
Mar 10
Typical first fall frost
Nov 15
Spring planting window
After your last frost, until mid-April
Fall planting window
late October to mid-December
Annual rainfall (approx.)
38 in

Frost dates are typical metro values, not forecasts. Mild, wet winters and dry summers: winter wet and summer drought matter more than cold for many plants. Our lists for Seattle use the rules for the Pacific Northwest.

Zone: USDA Plant Hardiness Zone Map, 2023 (USDA Agricultural Research Service; data by the PRISM Climate Group, Oregon State University). ZIP code to state data: GeoNames (geonames.org), CC BY 4.0.

A full-sun bed in Seattle

6 or more hours of direct summer sun, 12 × 6 ft.

12 × 6 ft · Zone 9a · 6+ hours of sun · Cottage

Kinds

5

Plants

30

Coverage

92%

Mulch

9 bags

Mulch: 0.67 cu yd at 3 in deep (9 bags of 2 cu ft). Plants cover about 92% of the 72 sq ft bed when mature.

A part-shade bed in Seattle

2 to 4 hours of direct summer sun, 12 × 6 ft.

12 × 6 ft · Zone 9a · 2–4 hours of sun · Classic

Kinds

5

Plants

27

Coverage

83%

Mulch

9 bags

Mulch: 0.67 cu yd at 3 in deep (9 bags of 2 cu ft). Plants cover about 83% of the 72 sq ft bed when mature.

A shady bed in Seattle

Under 2 hours of direct summer sun, 12 × 6 ft.

12 × 6 ft · Zone 9a · Under 2 hours of sun · Classic

Kinds

5

Plants

30

Coverage

82%

Mulch

9 bags

Mulch: 0.67 cu yd at 3 in deep (9 bags of 2 cu ft). Plants cover about 82% of the 72 sq ft bed when mature.

Guides for zone 9

Questions and answers

What hardiness zone is Seattle, Washington in?
Central Seattle (ZIP 98101) is in zone 9a on the 2023 USDA map: the coldest night of an average winter falls between 20°F and 25°F. Suburbs can be half a zone colder.
When is the last frost in Seattle?
Typically around Mar 10 in spring and Nov 15 in fall. These are typical dates; any one year can be two weeks earlier or later.
When should I plant shrubs and perennials in Seattle?
In spring, after your last frost, until mid-April; in fall, late October to mid-December. Fall planting gives roots a cool, moist season to settle before summer.
How many plants do I need for a 12 × 6 ft bed in Seattle?
Our full-sun bed list for Seattle uses 30 plants of 5 kinds, plus 9 bags of mulch.

How this page was made

This page was generated from FloraVista's plant table by fixed rules: the rules engine composed each list for the city's 2023 USDA zone, its region's summers and its state's invasive lists. The frost dates and rainfall are approximate metro values. No person or chat model chose these plants, and no named expert has reviewed this page.

Data status: the plant table is awaiting review by a horticulturist. Check each plant with a local nursery or extension office before you buy.

Sources

  • Missouri Botanical Garden Plant Finder, state extension services and the USDA PLANTS database (zones, size, sun, water, bloom, native range)
  • ASPCA toxic and non-toxic plant lists (dog and cat toxicity)
  • Rutgers NJAES and regional extension deer-resistance ratings
  • State noxious-weed and invasive-plant lists and the Invasive Plant Atlas of the US
  • Typical US garden-centre listings (pot size and price band)
  • USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture. Data by the PRISM Climate Group, Oregon State University.
  • ZIP code to state data: GeoNames (geonames.org), licensed under CC BY 4.0.

Generated . How FloraVista chooses plants