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Summer squash varieties, including zucchini and yellow squash, flower earlier than the winter squash varieties. Most summer squashes begin blooming within 35 to 45 days of germination. Winter squashes, which include butternut, acorn and spaghetti squash, may take up to 55 days before they set their first blossoms. Poor growth from overcrowding, dry soil or fungal diseases may delay flowering.
The best time when to harvest squash of these varieties is while they are still small. The size of summer squash when it is ready to be picked is around 6 inches long or wide, if it is the patty pan variety. Beyond this size, summer squash begins to develop a think skin and becomes bitter. The flavor is not the best for cooking. Frequent harvesting will also encourage the plant to produce more fruit.