Oregon: Plant Hardiness Zones, Climate & Soil Conditions

Our experienced writers spend hours deep researching, considering both scientific and experimental info to bring the insights you can trust.  

Oregon is a state in the Pacific Northwest region of the United States.

The state’s name comes from the Oregon River, which flows from the north through the state.

Oregon is known for its diverse landscapes.

The state is also home to many different kinds of animals and plants. Oregon has a long history of agriculture.

The climate in Oregon is ideal for growing crops. Oregon’s farmers grow a wide variety of crops, including wheat, corn, potatoes, and oats.

They also raise cattle and sheep.

The state receives a lot of rain, which helps plants grow. The warm summers help crops ripen and mature.

The state’s climate and geography are well suited to agriculture. The Willamette Valley in particular, is one of the most productive agricultural regions in the United States.

The valley is home to many large farms specializing in various crops. The fertile soil and mild climate allow farmers to grow crops.

Oregon’s agricultural industry contributes billions of dollars to the state’s economy each year.

Plant Hardiness Zone Map for Oregon

Let us take a glimpse of the US Plant Hardiness Zone Map.

Plant Hardiness Zone Map for Oregon


Oregon experiences a huge difference in temperatures across four seasons: summers, spring, winters, and autumn.

The state belongs to zone 4b-9. In July, summer temperatures average 64-68°F on the west coast, while they range between 81-94°F in the eastern portion of the state.

In the Cascade Mountains, the average winter temperature is around 18°F in January, while they register in the mild 37-42°F range in the coastal region.


There is a significant difference in the received rainfall from the west coast to the central and eastern regions.

The coast registers 80-90 inches of rain annually, which increases up to 200 inches on the western slopes of the Coast Range.

Average annual snowfall ranges from 2 inches along the coast to 12 inches in the inland valleys. Central Oregon receives 20 inches of snow, while the eastern region records 55 inches.

The mountain ranges record a massive 150-550 inches of snow, with the heaviest snowfall in the Cascade Mountains. 

Soil Type

The map that follows shows the ecoregions of the state.

Now, let us see the soil order distribution across the state using the table.

Soil Order Of Oregon

Soil / Sub OrderLocationCharacteristics
Mollisols/Xerolls, Aquolls, and CryollsXerolls are majorly found in the eastern and the southern part of the state. Aquolls is mainly found in the Willamette Valley
Cryolls in the southern part of eastern cascades slopes and foothills.
1. Xerolls are the more or less freely drained Mollisols of regions that have Mediterranean climates.
2. Aquolls are the wet Mollisols.
3. Cryolls are the cool or cold, more or less freely drained Mollisols.
Andisols/Cryands and UdandsCryands in the Cascades and the Blue Mountains while Udands in the Coast range1. Cryands have a cryic temperature regime.
2. Udands have a udic moisture regime, a warm temperature regime, and a relatively high content of water held too tightly for plants to use.
Ultisols/Aqualfs and XeralfsAqualfs in the Willamette Valley and Xeralfs in the Klamath Mountains1. Aqualfs have warm and aquic conditions.
2. Xeralfs have a xeric soil moisture regime.
Aridisols/Argids, Durids and SalidsIn the southeastern part1. Argids have an argillic or natric horizon
2. Durids are the Aridisols that have a duripan.
3. Salids are the Aridisols that have a salic.
Inceptisols/Udepts and XereptsUdepts in the Coast Range and the Cascades while Xerepts in the Klamath Mountains1. Udepts are mainly freely drained Inceptisols that have a udic or perudic moisture regime.
2. Xerepts are mainly freely drained Inceptisols that have a xeric moisture regime.
3. freely drained Inceptisols that have a xeric moisture regime.
Spodosols/CryodsIn the Klamath Mountains1. Cryods are the cold Spodosols of high latitudes and/or high elevations.

Looking for Plant Hardiness, Climate & Soil Conditions for other US States? Check out our guides for other states here>