Harvest Calendar
When the main cereals are harvested in each climate zone, what the ripening phases look like, and what pulls the date forward or back.
A cereal harvest begins when two conditions meet: the crop has reached physiological maturity, and kernel moisture has fallen into a range the machinery can handle. From that point the crop only dries down, so the harvest window is a race between falling moisture and the risk of weather damage.
In the temperate Northern Hemisphere the sequence is predictable. Winter barley starts first, in early summer; winter wheat follows through June and July; spring-sown wheat, barley and oats finish the season in August and September. Maize and rice close the year, often wet enough to need mechanical drying.
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In the tropics the calendar is set by rain rather than by temperature. Monsoon Asia's main rice crop is cut as the rains retreat, from October onward, and irrigated systems add a second or even a third harvest. Semi-arid sorghum and millet follow the same logic: harvest begins when the rainy season ends.
The Southern Hemisphere mirrors the north with a six-month offset: Australian and Argentine wheat is harvested from November into January. Near the equator, altitude takes over from latitude, and some highland regions can harvest in almost any month.
Within any zone, the exact date is set by sowing time, variety length, altitude and the season's weather. A cool, wet spring delays everything; a hot finish can pull the window forward by two weeks. That is why every date in a harvest calendar is a range, not a deadline.
Further reading