Flax Plant Sprouts

• As new flax plants emerge, they are especially susceptible to freezing weather. Seeds are damaged at 32 degrees Fahrenheit, while stalks can withstand temperatures as low as 19.2 degrees Fahrenheit.
  
  

Mature Flax Plants

• A larger flax plant that has been hardened off and has grown two leaves is hardier. These plants can withstand temperatures in the low 20s.
  
  

Oregon Climate

• Though the coast and lower river valleys are protected from most frosts, other areas of Oregon experience freezing temperatures throughout winter. Much of the eastern half of the state lies in USDA hardiness zones from 6a to 4b. This translates to an average minimum sub-freezing temperature of 5 to 25 degrees Fahrenheit below zero.