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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.
This is because zucchini can grow up to 1 inch in length per day. For optimum flavor, you should pick the zucchini when they are between 6 and 8 inches long and no thicker than 1 1/2 inches across, according to the University of California Master Gardener Cooperative Extension.