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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.
Some varieties are considered winter squashes, but this has to do with the time of fruiting, rather than the time of planting. Zucchini are sun loving and wonât do well in cold soil. Therefore, plant your zucchini when the temperature of the soil outdoors is at least 55 Â°F (13 Â°C). This is normally after the first or second week of spring, after all chance of frost have passed.