Apples - They're harvested late summer through fall.
Artichokes - produce a second, smaller crop in the fall that tends to produce small to medium artichokes. Beets - are in season in temperate climates fall through spring, and available from storage most of the year everywhere else.  Broccoli - Is harvested year round but it is more sweet, less bitter and sharp when harvested in the cooler temperatures of fall in most climates.
Broccoli raabe, rapini - A more bitter, leafier vegetable than its cousin, broccoli, but likes similar cool growing conditions.
Brussels sprouts - grow on a stalk, and if you see them for sale that way snap them up - they'll last quite a bit longer than once they're cut.
Cabbage - can be harvested year round but the cooler the weather when it's harvested, the sweeter it tends to taste
Carrots -   Locally grown carrots are often available from storage through fall and early winter even in colder climates.
Cauliflower - may be grown, harvested, and sold year-round, but is at its best in fall and winter and into early spring. Celery - is at its best throughout the fall months 
Chard - is best harvested in late summer or early fall in colder areas, and fall through spring in warmer regions.
Chicories - are cool weather crops that come into season in late fall
Chiles - are best at the end of summer and into fall. Dried chiles are, of course, available year-round.
Cranberries -harvested in New England and the Upper Midwest in the fall.
Curly Endive (Frisée) - is a chicory, at its best in fall and winter.
Edamame - are fresh soy beans – look for them in late summer and fall.
Eggplant - (early fall) comes into season towards the end of summer, but bright shiny heavy-feeling specimens stay in season well into fall.
Escarole - is another chicory at its best in fall and winter.
Fennel - natural season is from fall through early spring.
Figs - have a short second season in late fall (the first harvest comes in summer) just in time for Thanksgiving.
Garlic -Fresh garlic is at its plump, sweetest best in late summer and fall but can be found in cold storage during other seasons
Grapes - (early fall) ripen towards the end of summer where they grow best; the harvest continues into fall.
Green beans - from mid-summer into fall Herbs – look for bundles of rosemary, parsley, thyme, and sage.
Horseradish - is at its best in fall and winter. Like so many other root vegetables, however, it stores well and is often available in decent shape well into spring.
Jerusalem artichokes/Sunchokes - are brown nubs, that look a bit like small pieces of fresh ginger. Look for firm tubers with smooth, tan skins in fall and winter.
Kale -from fall to early winter 
Kohlrabi -(late fall) comes into season by the end of fall, but stays at its sweet best into winter Mushrooms - Most wild mushrooms are in-season in summer through fall. Onions -come from storage all year round but most onions are harvested in late summer through the fall.
Parsnips - look like white carrots and have a great nutty flavor. Look for thinner parsnips, since fatter ones tend to have a thick, woody core you need to cut out.
Pears - have a season that runs from mid-summer well into winter, depending on the variety and region.
Peppers - (early fall) - both sweet and spicy- are harvested in late summer and early fall. Potatoes - are excellent storage vegetables, but most varieties are harvested in the fall.
Pumpkins - are the most common winter squash and come into season in September in most areas. Radicchio -like all chicories, radicchio is more sweet and less bitter when the weather is cool.
Radishes (all types) are so fast-growing that they can be sown several times during the growing season in most climates. Fall marks the end of the season for small red radishes and the beginning of the season for larger daikon-type radishes.
Rutabagas - also known as "yellow turnips" and "Swedes" are a sweet, nutty root vegetables perfect in stews, roasted, or mashed with plenty of butter.
Shallots are harvested in late summer and into fall, and are at their sweetest when fresh.
Shelling beans - are those beans that can become dried beans but are briefly available fresh, as shelling beans, in mid-summer to early fall
Spinach - best during the summer and fall
Sweet potatoes -  They store well and are available from local sources from late summer through winter other places. Turnips - have a sharp but bright and sweet flavor. Look for turnips that feel heavy for their size.
Winter squash - of all sorts comes into season in early fall and usually last well into winter.
Zucchini - have a harvest season from summer into fall in most climates.

 
BROCCOLI - Tastes better when harvested in the cooler temperatures of fall in most climates.
BRUSSELS SPROUTS - grow on a stalk, and if you see them for sale that way snap them up - they'll last quite a bit longer than once they're cut.
CABBAGE - is bright and crisp when raw and mellows and sweetens the longer it's cooked
CARDOONS - taste a lot like artichokes; look for firm, heavy-feeling specimens.
CARROTS - are available from winter storage from local growers
CAULIFLOWER - may be grown, harvested, and sold year-round, but it is by nature a cool weather crop and at its best in fall and winter and into early spring.
CHICORIES - are cool weather crops that come into season in late fall (and last in temperate climates through early spring). ESCAROLE - is another bitter chicory in season fall and winter.
FENNEL - has a natural season from fall through early spring. HORSERADISH - is at its best in fall and winter. Like so many other root vegetables, however, it stores well and is often available in decent shape well into spring.
JERUSALEM ARTICHOKES/SUNCHOKES - are brown nubs, that look a bit like small pieces of fresh ginger. Look for firm tubers with smooth, tan skins in fall and winter.
KALE - is like all hearty cooking greens - cooler weather keeps it sweet KOHLRABI -comes into season by the end of fall, but stays at its sweet best into winter.
LEEKS - more than about 1 1/2 inches wide tend to have tough inner cores. The top green leaves should look fresh - avoid leeks with wilted tops. ONIONS - From storage PARSNIPS - look like white carrots and have a great nutty flavor. Look for thinner parsnips, since fatter ones tend to have a thick, woody core you need to cut out. POTATOES - From storage
RADICCHIO - like all chicories, radicchio is more sweet and less bitter when the weather is cool.
RADISHES - (large varieties)
RUTABAGAS - also known as "yellow turnips" and "Swedes" are a sweet, nutty root vegetables perfect in stews, roasted, or mashed with plenty of butter.
SATSUMAS - have loose skins and super-sweet tangerine flavor.
SHALLOTS - From storage
SWEET POTATOES - are often sold as "yams." They store very well and so are available from local sources year-round in warmer areas and otherwise from late summer through winter. TREVISO - is the longer, slimmer, more elegant version of radicchio.
TURNIPS - have a bad rap they don't deserve. Fresh turnips have a sharp but bright and sweet flavor. Look for turnips that feel heavy for their size.
WINTER SQUASH - of all sorts comes into season in early fall and usually last well into winter.

 
Artichokes - have a second crop in the fall, but the main harvest takes place in the spring when the largest thistles are available
Arugula (a.k.a. rocket) - is a cool-weather crop. Wild arugula is foraged in spring and again the fall
Asparagus - Harvested from March through June, depending on your region.
Beets - In season in temperate climates fall through spring, and available from storage most of the year everywhere else. Fresh beets are often sold with their greens still attached
Carrots - Harvested year-round in temperate areas. True baby carrots - not the milled down versions of regular carrots sold as "baby carrots" at grocery stores - are available in spring and early summer
Cherries - Harvest at the end of spring in warmer areas. Sweet cherries, including the popular Bing and Rainier varieties, are available from May to August. Sour cherries have a much shorter season, and can be found for a week or two, usually during the middle of June in warmer areas and as late as July and August in colder regions
Fennel - Available from fall through early spring
Fiddleheads - Available in early spring through early summer depending on the region; these young wild ferns are foraged
Garlic scapes/green garlic - Available in spring and early summer. Green garlic is immature garlic and looks like a slightly overgrown scallion
Green onions/Scallions - Are cultivated year-round in temperate climates and come into harvest in the spring in warmer areas
Leeks – Available throughout spring time
Lemons - From winter into early summer
Lettuce – Early spring to late summer
Mint – Begins growing in spring
Parsley – Year round, but especially good during spring
Pea greens - Are sold in big tumbled masses in spring and early summer.
Peas - Come into season in the spring and continue in most areas well into summer
Radishes are at their sweet, crunchy best in the spring
Ramps are foraged in the spring and early summer and sometimes available at farmers markets and specialty stores
Rhubarb - Is the first fruit of spring in many areas - look for heavy stalks with shiny skin
Strawberries - Peak season is April through June
Sweet Onions - Available in spring and summer
Turnips – Spring and summer, available from cold storage year round


 
Apples - July through October (cold storage until spring) 
Arugula - May through September 
Asparagus - May and June 
Basil - July through September
Beets - June through December
Blueberries - July and August
Broccoli - June through November
Broccoli raab - August through November
Cabbage - June through October
Cantaloupes - August and September
Carrots - June through September (local harvest available from storage through March)
Cauliflower - August through November
Celery - August through October 
Chard - May through November 
Cherries - July
Corn - June through August 
Cranberries - October through December 
Cucumbers - July through October
Currants - August 
Eggplant - July through October 
Escarole - September and October 
Fava beans - May and June 
Fennel - October and November 
Fiddleheads - April and May Garlic - July through October (stored year-round) 
Garlic scapes/green garlic - May and June 
Grapes - September and October 
Green beans - July through September 
Green onions/scallions - May through September 
Kale - June through November 
Herbs - April through September 
Kohlrabi - June and July - September and October
Leeks - August through December 
Lettuce - May through October 
Melons - July through October 
Mint - spring and summer
Mushrooms (cultivated) - year-round
Nectarines - August and September 
Onions - July through October (stored in winter) 
Oregano - June through October 
Parsley - May through November
Parsnips - April and May and again October through December 
Peaches - July through September 
Pears - August through December 
Pea greens - April through June 
Peas and pea pods - July through October 
Peppers (sweet) - July through October 
Plums & pluots - August and September 
Potatoes - July through December (available from storage year-round)
Pumpkins - September through November 
Radicchio - September and October 
Radishes - May through September 
Raspberries - July though September 
Rhubarb - May through July
Rutabagas - August through November
Scallions/green onions - May through September
Snap peas/snow peas/pea pods - June through September
Spinach - May through September
Squash (summer) - July through September
Squash (winter) - August through December
Strawberries - June
Thyme - May through September
Tomatoes - July through September
Turnips - August through November (local harvest available from storage through the winter)
Watermelons - August through October 
Winter Squash - August through December 
Zucchini - July through September
Zucchini Blossoms - June and July