Washington Planting Zones – Growing Zones Guide

What Planting Zone Is Washington In?

On the 2023 USDA Plant Hardiness Zone Map, Washington runs roughly from zone 4b to zone 9a, based on 30-year averages of the coldest winter temperatures (1991–2020). Colder zones cover the higher Cascades, Northeast Washington, and pockets of Central Washington. The mildest zones hug the Pacific coast and parts of the Puget Sound lowlands. Most home gardens fall between zones 6b and 8b.^*

• Pacific Coast: Ocean Shores, Aberdeen, Hoquiam, Long Beach, and coastal communities are generally zones 8a–9a, with cool summers, mild winters, frequent rain, and small temperature swings.
• Puget Sound & I-5 Corridor: Bellingham, Everett, Seattle, Bellevue, Tacoma, Olympia, and Vancouver are typically zones 8a–8b, with cool, wet winters, dry summers, and long, relatively mild growing seasons.
• Southwest Washington & Lower Columbia: Longview, Kelso, Chehalis, and nearby valleys run about zones 7b–8b, with marine-influenced winters and warm but not extreme summers.
• Central Washington Valleys: Yakima, Ellensburg, Wenatchee, and the Columbia Basin sit around zones 6a–7b, with hotter, drier summers, colder winters, and big day–night temperature swings.
• Eastern Washington Plateaus & Palouse: Spokane, Pullman, Walla Walla, Tri-Cities, and surrounding farm country range from roughly zones 6a–7b, with cold, snowy winters and warm, dry summers.
• Cascades & Olympic Mountains: Higher-elevation communities and mountain valleys can be as cold as zones 4b–6b, with long winters, late frosts, and short growing seasons.

^*Zones summarized from the 2023 USDA hardiness map and Washington-specific analyses based on 1991–2020 climate data.

USDA Hardiness Zone Maps for Washington

The updated 2023 USDA Plant Hardiness Zone Map uses 30-year climate normals (1991–2020) and higher-resolution terrain and elevation data than earlier versions, refining zone lines across Washington’s complex terrain.^* A Washington-focused analysis confirms that the state spans roughly zones 4b–9a, with warmer zones expanding slightly compared with the older 2012 map.

Imagine a Washington planting zone map here showing colder blues and purples along the Cascades, Northeast Washington, and high plateaus, with warmer greens and yellows along the coast, Puget Sound, and lowland valleys.

Use the map alongside your ZIP code to pinpoint your Washington garden zone. Look up your Washington planting zone by ZIP code using the USDA tool, then come back here or visit our Plant Finder for plants tailored to your zone, elevation, and site conditions.

^*According to the USDA and state-level climate groups using 1991–2020 data.

Washington Growing Zones by Region

Like most of the Pacific Northwest, Washington’s climate is shaped by mountains, ocean, river valleys, and elevation. Marine layers, Fraser outflow events, east winds, rain shadows, cold-air drainage, urban heat islands, and reflected heat from pavement and buildings can nudge your yard a half-zone – or more – warmer or colder than the official map. Zone boundaries can shift quickly over short distances (for example, a Yakima Valley low spot can be noticeably colder than a nearby hillside orchard).

Pacific Coast (Approx. Zones 8a–9a)

This region includes Aberdeen, Hoquiam, Ocean Shores, Westport, Long Beach, and small coastal communities.

• Cool summers, mild winters, and abundant rain keep soils moist and temperatures even, with rare hard, prolonged freezes.
• Excellent for brassicas, leafy greens, root crops, berries, hydrangeas, rhododendrons, ferns, and moisture-loving perennials.
• Choose plants that tolerate low light, wind, and salt-laden air; raised beds and good drainage help in heavy, wet soils.

Puget Sound & I-5 Corridor (Approx. Zones 8a–8b)

This region includes Bellingham, Everett, Seattle, Bellevue, Redmond, Tacoma, Olympia, and Vancouver.

• Marine influence brings cool, wet winters and dry, pleasantly warm summers; snow and hard freezes are occasional rather than routine at low elevations.
• Ideal for berries, fruit trees, cool-season vegetables, hazelnuts, ornamental shrubs, and long-blooming perennials.
• Microclimates abound: sheltered urban courtyards and south-facing walls can be a half-zone warmer than open, windy sites or valley bottoms along lakes and rivers.

Southwest Washington & Lower Columbia (Approx. Zones 7b–8b)

Longview, Kelso, Chehalis, Centralia, and nearby valleys share marine-moderated winters and warm summers.

• Mild, wet winters and warm, dry summers favor berries, cool-season greens, fruit trees, and ornamental shrubs.
• Cold air can pool in valley bottoms; hillsides and terraces may be slightly warmer and better for marginally hardy plants.
• Rainy winters make drainage and soil structure especially important for long-term plant health.

Central Washington Valleys & Columbia Basin (Approx. Zones 6a–7b)

Yakima, Ellensburg, Wenatchee, Moses Lake, and surrounding agricultural areas lie in Washington’s sunny interior.

• Hot, dry summers and colder winters with clear nights shape plant choices and irrigation strategies.
• Great for apples, wine grapes, stone fruits, hops, and heat-loving vegetables, with attention to frost pockets and spring cold snaps.
• Drip irrigation, mulching, and wind protection are key tools in these semi-arid landscapes.

Eastern Washington Plateaus & Palouse (Approx. Zones 6a–7b)

This region includes Spokane, Cheney, Pullman, Walla Walla, Tri-Cities (Kennewick, Pasco, Richland), and surrounding farming communities.

• Cold winters and warm, dry summers with relatively low humidity; frost can arrive early in fall and linger late in spring.
• Excellent for cool-season crops, hardy grasses, forage plants, and drought-tolerant ornamentals; warm-season vegetables benefit from careful timing and, in some areas, season extension.
• Pay close attention to slope, elevation, and exposure: south-facing slopes stay frost-free longer than valley bottoms and low draws where cold air collects.

Cascades & Olympic Mountains (Approx. Zones 4b–6b)

Higher-elevation communities, ski towns, and mountain valleys on the Olympic Peninsula and in the Cascade Range experience long, snowy winters and short growing seasons.

• Cold winters, heavy snow, late spring frosts, and cool summers limit plant choices to the hardiest trees, shrubs, conifers, and perennials.
• Vegetables often require raised beds, tunnels, quick-maturing varieties, and strict timing to fit within the frost-free window.
• Site selection is critical: south-facing slopes and wind-sheltered spots warm first and often perform a half-zone warmer than nearby low basins.

Best Plants for Washington Planting Zones

Once you know your Washington planting zone – and whether you garden in a cool coastal pocket, a mild Puget Sound backyard, a sunny Yakima Valley slope, or a frosty mountain or plateau town – you can work with your climate instead of against it. Focus on plants that tolerate cool, wet winters, summer drought, and wide day–night temperature swings. Choose perennials rated for zones 4–9, and time annual plantings around your frost dates and summer heat.

Vegetables for Washington Growing Zones

• Cool-season crops (fall–spring in much of western Washington; spring and fall inland): lettuce, spinach, arugula, kale, collards, peas, broccoli, cabbage, carrots, beets, turnips, and radishes.
• Warm-season crops (after last frost inland; spring and early summer in the mildest 8b–9a west-side pockets): tomatoes, peppers, summer squash, pumpkins, cucumbers, snap beans, sweet corn, and melons in interior valleys and the warmest, sunniest Puget Sound sites.
• High-elevation & frost-prone gardens: Quick, cold-tolerant varieties of peas, lettuce, spinach, baby carrots, radishes, Asian greens, and compact determinate tomatoes under protection in zones 4–6.

Fruits & Trees for Washington Hardiness Zones

• Valleys & foothills (zones 6–8): apples, pears, cherries, peaches, plums, and wine or table grapes chosen for local heat and disease pressure.
• Coastal & mild urban microclimates (8b–9a): Hardy figs, pomegranates, olives, and select citrus varieties in the warmest, most protected sites, often with winter protection or container growing.
• Small fruits (many zones 5–8): strawberries, blackberries, raspberries, blueberries, and currants thrive with acidic, organic-rich soil and regular water.

Flowers & Ornamentals for Washington Garden Zones

• Sun-loving bloomers: salvias, yarrow, coneflowers, black-eyed Susan, blanket flower, and hardy daisies for sunny, well-drained beds.
• Reliable perennials: lavender, catmint, ornamental grasses, penstemons, hardy geraniums, and hellebores offer long seasons of interest.
• Structural plants: Shade trees, dwarf conifers, evergreen shrubs, and cold-hardy agaves and succulents in the driest areas provide year-round structure.

Native Plants for Washington Landscapes

Pacific Northwest and Washington native plants are adapted to local soils, rainfall patterns, and seasonal drought – and they feed pollinators, birds, and beneficial insects. Mix native wildflowers, shrubs, trees, and grasses for a resilient, habitat-rich landscape that feels authentically Washington.

• Native wildflowers: Oregon sunshine (Eriophyllum lanatum), camas, poppies, lupines, western columbine, and native milkweeds.
• Native grasses: tufted hairgrass, Roemer’s fescue, native bunchgrasses for meadows, slopes, and low-mow lawns.
• Native shrubs & trees: Oregon grape, red-flowering currant, vine maple, serviceberry, snowberry, and regional conifers like Douglas-fir, western redcedar, and ponderosa pine where appropriate.
• Cacti & succulents (drier sites): cold-hardy prickly pear, hens-and-chicks, sedums, and select yuccas for bold texture and low-water planting in Central and Eastern Washington.

Interactive Washington Planting Calendar (General Guide)

Tap a month to see what to plant in Washington by zone. Use this as a starting point, then adjust for your exact frost dates, elevation, and whether you garden on the coast, around Puget Sound, in Central Washington, or in Eastern Washington’s plateaus and mountains.

Washington Gardening Tips by Zone

Washington gardeners juggle cool, wet winters; summer drought; marine fog; Fraser outflow and east winds; high-desert cold; and a wide spread of hardiness zones and microclimates. These tips help plants thrive from zones 4b to 9a:

• Know your microclimate. A sheltered Seattle courtyard or coastal patio can behave like a warmer zone 9, while a Yakima Valley frost pocket or a Spokane basin may feel a zone colder than the map.
• Time your seasons. West of the Cascades, prime vegetable season often runs from early spring through early summer and again in fall; in Central and Eastern Washington, focus on the frost-free window and rely heavily on season extension.
• Build better soil. Many Washington soils are clayey, compacted, or glacial till – add compost regularly, protect soils with mulch, and consider raised beds for vegetables in poorly drained or rocky spots.
• Water wisely. Use drip irrigation, deep but infrequent watering, and thick mulch to conserve moisture and buffer roots from heat, especially where summer drought and water restrictions are common.
• Plan for wind and sun. Windbreaks, trellises, fences, and living screens protect plants from Puget Sound storms, Gorge winds, and high-desert gusts, while smart shade and understory planting protect roots from intense summer sun.
• Use season-extension tools. Row covers, low tunnels, and cold frames stretch the season in Central and Eastern Washington and help protect warm-season crops from surprise frosts statewide.
• Choose cool- and drought-tolerant varieties. Favor vegetable varieties bred for short seasons or cool summers in the north, and ornamentals labeled “drought tolerant” or “xeric” for low-rainfall regions.
• Plan for fire and wildlife. In fire-prone areas, maintain defensible space and avoid highly flammable plantings near structures. Deer, slugs, squirrels, and rabbits are common visitors – use fencing, barriers, and resistant plant choices around high-value beds.
• Lean on native and region-adapted plants. Use natives as a low-water backbone, then layer in edibles and higher-water plants where you can irrigate efficiently.