This is helpful seasonal produce chart can be found in
The Northwest Vegetarian Cookbook: 200 Recipes that Celebrate the Flavors of Oregon and Washington by Debra Daniels-Zeller (2010, Timber Press)
Seasons for Local Fruits and Vegetables
In the Northwest, the seasons for vegetables and fruits vary slightly from region to region and from year to year. For example, strawberries show up in the Willamette Valley weeks earlier than those in the Skagit Valley, north of Seattle. And each year the weather is a little different so some crops come late and others show up a little early. Michaele Blakely of Growing Things Farm in Carnation, Wade Bennett of Rockridge Orchards in Enumclaw, and Liz Eggers of Grouse Mountain Farm in Chelan, Washington, helped me compile the following dates for seasonal produce availability.
Apples late July – October
Apricots June – August
Artichokes April – July
Asian pears August – November
Asparagus May – June
Bamboo shoots April – July
Beans, green July – October
Beans, shell (dried) August – October
Beets May – November
Blackberries August – September
Blueberries June – September
Bok choy year-round
Boysenberries July – August
Broccoli year-round
Brussels sprouts November – February
Cabbage year-round
Cardoons April – June
Carrots May – February
Cauliflower year-round
Celeriac September – October
Celery August – November
Chard year-round
Cherries June – July
Collards year-round
Corn July – October
Cranberries October – November
Cucumbers July – September
Currants August
Dandelion greens March – April
Eggplant July – August
Fava beans throughout harvest season
Fennel July – October
Figs Late June – July and September – October
Garlic June – October
Grapes August – October
Greens, specialty year-round
Greens, wild March – June
Herbs June – September
Huckleberries, blue August – October
Huckleberries, red July
Jerusalem artichokes fall through winter
Kale year-round
Kiwis September – October
Kohlrabi year-round
Leeks year-round
Lettuce year-round
Melons August – November
Mulberries July – August
Mushrooms, wild June – November
Nectarines July – August
Nettles early spring
Okra July – September
Onions June – November
Parsley May – September
Parsley root October
Parsnips October – early spring
Pawpaws October
Peaches July – August
Pears August – October
Peas June – fall
Peppers June – fall
Persimmons October – November
Plums August – September
Potatoes July – November (winter storage)
Pumpkins October – November
Purslane June – September
Quince October – November
Radishes year-round
Raspberries June – October
Rhubarb May – September
Romanesco cauliflower late August – November
Rutabaga October – throughout winter
Shallots August – September
Soybeans, green July – October
Spinach year-round
Squash, summer June – frost
Squash, winter September – November (storage)
Strawberries June – October
Sweet potatoes November – December
Tomatillos July – September
Tomatoes July – September
Turnips year-round