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

• Apples, Ambrosia
• Apples, Brae­burn
• Apples, Cameo
• Apples, Gala
• Apples, Gold­en Delicious
• Apples, Hon­ey­crisp
• Apples, Jon­agold
• Apples, McIn­tosh
• Apples, Pink Lady
• Apples, Red Delicious
  
• Arugu­la
• Basil
  
• Beans, Green
  
• Beets, Chiog­gia
• Beets, Gold
• Beets, Red
• Bell Pep­pers, Green
• Bell Pep­pers, Orange
• Bell Pep­pers, Red
• Bell Pep­pers, Yellow
• Bok Choy
  
• Bok Choy, Baby
• Broc­coli
• Bur­dock
• Cab­bage, Green
• Cab­bage, Napa
• Cab­bage, Red
• Cab­bage, Savoy
• Car­rots
• Cau­li­flower
• Cel­ery
• Chard, Rain­bow
• Chard, Red
• Chard, Swiss
• Chile Pep­pers, Ana­heim / Hot Cher­ry / Jalapeño / Poblano
• Cilantro
  
• Col­lard Greens
• Corn
• Cucum­bers
• Dan­de­lion
• Dill
• Egg­plant
• Esca­role
• Fen­nel
• Frisee (Curly Endive)
• Gar­lic, Purple
• Kale
• Kohlra­bi
• Leeks
  
• Let­tuce
• Mel­ons, Ambrosia / Can­taloupe / Galia / Hon­ey­dew / Watermelon
• Mush­rooms
  
• Mus­tard Greens
• Nec­tarines
• Onions, Green (Scal­lions)
• Onions, Red
• Onions, Yel­low
• Pars­ley, Cur­ley / Italian
  
• Peach­es
• Pears, Asian
• Pears, Bartlett
• Pears, Bosc
• Plums
• Plu­ots
• Pota­toes, Fingerling
• Pota­toes, Red
• Pota­toes, Russet
• Pota­toes, Yukon Gold
• Pump­kins
• Radic­chio
• Radish­es
  
• Romanesco
• Rutaba­gas
• Shal­lots
• Spinach, Baby
• Spinach, Bunch
• Sum­mer Squash, Crookneck
  
• Sum­mer Squash, Sunburst
• Sum­mer Squash, Zucchini
• Sweet Pota­toes (Yams)
• Tomatil­los
• Toma­toes
• 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.