Pick summer squash between 5-8" long, before the skin gets tough, and the flavor starts to change. Younger is better than older. This article should help: https://www.gardeningknowhow.com/edible/vegetables/squash/when-to-harvest-squash-best-time-to-pick-winter-or-summer-squash.htm
Answered on June 22, 2013
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