Vine's Expository Dictionary of NT Words
akin to therizo, "to reap," is used (a) of "the act of harvesting," John 4:35; (b) "the time of harvest," figuratively, Matthew 13:30,39; Mark 4:29; (c) "the crop," figuratively, Matthew 9:37,38; Luke 10:2; Revelation 14:15 . The beginning of "harvest" varied according to natural conditions, but took place on the average about the middle of April in the eastern lowlands of Palestine, in the latter part of the month in the coast plains and a little later in high districts. Barley "harvest" usually came first and then wheat. "Harvesting" lasted about seven weeks, and was the occasion of festivities.
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Vines, W. E., M. A. Entry for 'Harvest'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/h/harvest.html. 1940.