These fruits and veg­eta­bles are typ­i­cal­ly in sea­son in Decem­ber in Wash­ing­ton state:

• Apples, Ambrosia
• Apples, Brae­burn
• Apples, Cameo
• Apples, Cos­mic Crisp
• Apples, Fuji
• Apples, Gala
• Apples, Gold­en Delicious
• Apples, Granny Smith
• Apples, Hon­ey­crisp
• Apples, Jon­agold
• Apples, Pink Lady
• Apples, Red Delicious
• Beets, Chiog­gia
• Beets, Red
  
• Bur­dock
  
• Cab­bage, Green
• Cab­bage, Red
• Cab­bage, Savoy
• Car­rots
• Cel­ery Root (Cele­ri­ac)
• Cilantro
  
• Fen­nel
  
• Frisee (Curly Endive)
• Leeks
  
• Mush­rooms
  
• Onions, Red
  
• Onions, Yel­low
• Parsnips
  
• Pears, Asian
  
• Pears, Bosc
  
• Pears, d’An­jou
• Pota­toes, Fingerling
  
• Pota­toes, Red
• Pota­toes, Russet
• Pota­toes, Yukon Gold
• Shal­lots
  
• Sun­chokes
  
• Sweet Pota­toes (Yams)
• Turnips
  
• Win­ter Squash, Acord
• Win­ter Squash, Buttercup
• Win­ter Squash, Butternut
• Win­ter Squash, Delicata
• Win­ter Squash, Spaghetti

See What’s in sea­son in Wash­ing­ton state for sources and a Google Sheets spread­sheet with data for the whole year.