also: でざかり
noun
peak season; best time; in full season
Used for produce, seafood, or other seasonal items when they are at their peak availability and quality. Often appears as 出盛りを迎える or 出盛りの時期.
今はトウモロコシの出盛りだ。
Corn is in peak season now.
出盛りの果物は安くて美味しい。
Fruit in full season is cheap and delicious.
Compound of 出 (で, 'coming out') and 盛り (さかり, 'peak, height'), referring to the time when something comes out in abundance.