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Seed to Harvest. Zucchini do not take long to grow once you plant the seeds in the ground. Depending on the variety, you may be able to harvest the plants anywhere from 42 to 52 days after planting. This time includes blooming and pollination of the flowers.
The first fruits from summer. squash, such as zucchini, should be ready by. early July. If no disease problems develop and. fruits are harvested regularly, plants will continue. to produce until frost. Harvest summer squash. young, they are best when 10 inches or shorter. Winter squash and pumpkins take much longer.