Oregon Planting Zones

The beautiful state of Oregon is home to six different growing zones (4, 5, 6, 7, 8, and 9), and the average minimum temperature sits between -25° to 30° F (-31.7° to -1.1° C).

In this article, you will learn:


The state’s landscape is diverse and comprises stunning mountainous regions, desert plateau, dense redwood and evergreen forests, large deep valleys, and rocky coastlines. Yet, despite the undeniable beauty of Oregon, gardeners may experience numerous difficulties when planting throughout this region.

 

Image from USDA


Characteristics of Oregon Planting Region

The climate in Oregon is typically mild with cool summers and cold winters and varies across the region. 

  • The Coastal Area 
    This region experiences mild to cool temperatures throughout the year, with plenty of wind and fog. Despite the longer growing season of 190 - 250 days, gardeners will struggle with the weather and lower temperatures in this area.
  • Western Valleys
    Winters are very mild, and summers are characterized by warm days and cool nights in this part of the state. The growing season is anywhere between 150 and 250 days; however, the dates can change every year. 
  • Central and Eastern Regions
    The Cascade mountain range and the high-elevation desert area experience short growing seasons of between 90 and 120 days. It’s important to note that frost can realistically happen on any day of the year in this region. 
  • Columbia and Snake River Valleys
    Hot days and warm nights are frequent in this area. The planting season will last anywhere between 120 and 200 days; however, gardeners may face difficulties with heat and wind drying out their crops.

Additionally, Oregonians across the state may experience temperature extremes, earthquakes, wildfires, winter storms, and flooding throughout the year. 

 

View of Mount Hood, Oregon, USA

Challenges of Growing in Oregon

1. Severe Weather

The extreme weather conditions across the region present a variety of difficulties for gardeners. Raised garden beds and protective coverings are recommended to keep your hard work safe from the floods and winter storms in the area.

2. Temperature Extremes

Despite the generally mild climate across the region, Oregon will experience extreme temperature fluctuations throughout the year. Severe heatwaves in the summer months are expected, so it’s suggested to utilize indoor and ventilated growing to keep your plants alive and well.

3. High Elevation

Much of the state sits at a higher altitude, presenting a range of difficulties for gardeners in these areas. Temperamental weather, poor soil conditions, low humidity, and the danger of frosts throughout the year are a few obstacles gardeners are faced with here.

 

View of Three Sisters Mountains, Oregon, USA

The Benefits of Using a Greenhouse in Oregon

A Planta greenhouse can offer Oregonians an extended growing season, protection from extreme weather and early frosts, and a cool, ventilated area for pants to thrive even during a heatwave. Additionally, gardeners will have the ability to grow a much wider variety of plants than traditional outdoor growers.

1. Extend your Growing Season

  • Without a Greenhouse:
    The growing season varies dramatically across the region and can sit anywhere between 90 and 250 days, depending on where you’re located. However, it’s important to note that various difficult weather conditions may create a challenging environment for gardeners despite the extended planting season in some parts of the state.
  • With a Greenhouse:
    A Planta Greenhouse will allow gardeners to double or triple their growing seasons in Oregon. In higher altitude areas, the planting season can easily be extended between 7-9 months, while those living on the coast and in the valleys can potentially grow all year round.


Learn more about specific growing dates for your area and the best vegetables to plant in each part of Oregon.


    

Customer images of the Sungrow Greenhouse in a similar climate

Grow a Wider Variety of Vegetables 

  • Without a Greenhouse:
    While vegetable options will vary for gardeners depending on what planting zone and part of the state you’re located in, cold-hardy vegetables are suggested for the cooler climate and the potential for snap frosts. Some of the recommended vegetables for this region include:
  • Broccoli
  • Beets
  • Arugula
  • Kale
  • Chard
  • Spinach
  • Lettuce
  • Cabbage 
  • With a Greenhouse:
    Greenhouse gardening will allow Oregonians to confidently plant a broader range of vegetables, including long-season and warm-season crops. Some of the vegetables known to thrive in a greenhouse in this region include:
  • Artichoke
  • Asparagus
  • Beans
  • Cauliflower
  • Carrots
  • Corn
  • Cucumbers
  • Eggplant
  • Garlic
  • Onions
  • Sweet Peppers
  • Potatoes
  • Pumpkins
  • Winter Squash
  • Tomatoes
  • Summer Squash
  • Melons
  • Cherry Tomatoes
  • Hot Peppers
  • Scallions
  • Cilantro
  • Dill
  • Celery
  • Watermelon
  • Okra

 

 
Vegetable Garden

Why Planta Greenhouses?

Customer Stories From Similar Climates

For Oregon, we recommend the following greenhouses:

  • Sungrow
    Sungrow greenhouses have a unique, modern, heavy duty design. The Made for backyard farming in Canadian climate. Sungrow Greenhouses withstand snow and wind like no other.
    View Sungrow
  • Sigma
    Sigma Greenhouses have a traditional look with an amazing, modern, heavy duty design. Snow, wind, Canadian winter, are no problem for the Sigma Greenhouse. Galvanized Steel and Best Polycarbonate.
    View Sigma
  • Planta Farmer
    The Farmer Commercial greenhouses Series by Planta is designed for commercial cultivation of agricultural crops in farms.
    View Planta Farmer