Papaya seeds can be planted at any time of year, but local conditions determine when it is best to harvest. Once planted, papaya seeds take six to nine months to mature in the hotter regions and nine to eleven months to mature in cooler climates, according to Purdue University.
Seeds that are planted in early summer or midsummer generally produce their first crop in the winter. Some growers manipulate their harvest season by stripping off six of the newly set fruit, which forces the plant to bloom again and produce papaya six to eight weeks later than it normally would. In South Florida, papaya planted in March or April will ripen in November or December. Papaya planted in July will not produce fruit for at least 10 months.