The 2 planting zones in Willamette Valley, Oregon are USDA Hardiness Zone 8b and USDA Hardiness Zone 9a, as per latest USDA data of 2023. The Willamette Valley contains most of Oregon’s population and extends from the Portland metro area in the north to Eugene in the south. The 2 planting zones in Willamette Valley, Oregon are listed below.
- USDA Hardiness Zone 8b: Zone 8b has average annual minimum temperatures of 15°F to 20°F (-9.4°C to -6.7°C) and covers most of the Willamette Valley, including Eugene, Salem, Corvallis, and surrounding towns.
- USDA Hardiness Zone 9a: Zone 9a features minimum temperatures of 20°F to 25°F (-6.7°C to -3.9°C) and includes the Portland metro area, such as Portland, Beaverton, and Lake Oswego, where urban heat islands and river proximity create warmer conditions.
Verify your Willamette Valley, Oregon, USDA zone using our three tools given below, zipcode to planting zone search tool, interactive map, or planting zone table.
Willamette Valley Planting Zones by ZipCode
Enter your Willamette Valley 5 digit Zip-code to find its USDA Planting Zone.
Willamette Valley Planting Zones Map
Select or type your Willamette Valley location in the search box below to find its USDA Growing Zone.
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Willamette Valley Area Planting Zone
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Willamette Valley Planting Zones Table
Below given table lists all the Willamette Valley locations with their USDA Hardiness Zones.
| Willamette Valley Location | Planting Zone |
|---|---|
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Willamette Valley Growing Zones
The 2 planting zones in Willamette Valley, Oregon are USDA Hardiness Zone 8b and USDA Hardiness Zone 9a.
Zone 8b
Zone 8b in Willaimette Valley covers areas like Eugene and Salem, and have average winter lows of 15°F to 20°F (-9.4°C to -6.7°C). This zone supports crops like corn (Zea mays) and tomatoes (Solanum lycopersicum), ornamental plants like lavender (Lavandula spp.) and Oregon Grape Holly (Mahonia aquifolium), and native species as Vine Maple (Acer circinatum) and Coyote Brush (Baccharis pilularis). Fruit trees such as blackberries (Rubus spp.) and blueberries (Vaccinium spp.) also grows here.
Zone 9a
Zone 9a in Willaimette Valley is found in the Portland metro area and experiences milder winters (20°F to 25°F/-6.7°C to -3.9°C), which helps in cultivation of heat-tolerant figs (Ficus carica) and citrus varieties like lemons (Citrus limon) and kumquats (Citrus japonica).
Ornamental plants such as hibiscus (Hibiscus spp.) and Oleander (Nerium oleander) alongside native plants like Bitter Cherry (Prunus emarginata) and Oregon Grape Holly (Mahonia aquifolium) also grows here.