"several indigenous American tribes, the full moon of October is known as the 'Hunter's Moon'---"
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Near coincidence of sunset and moonrise at the autumnal equinox (harvest moon) and the following month (hunter's moon) in the northern hemisphere. In two years out of three, harvest moon is in September. In some areas, 'Hunter's moon' is the full moon of November rather than the one following the 'harvest moon'.

'Hunter's moon,' origin uncertain, perhaps was coined by the English hunt set; crops were harvested and it was easy riding over the fields for their 'sport.' In any case, the term seems to be a late invention.

American Indian tribes who farmed had feasts following harvest, set by their ceremonial calendars and observances, which would be quite early in northern areas and much later in southern areas. Observances varied greatly from tribe to tribe. It is difficult to discern original practices, because by the time studies were made, those of many groups had been affected by Spanish, French or English practices.

Nomadic tribes made winter camp early in the north but continued hunting forays as the weather permitted; the horse changed hunting habits in the buffalo plains and foothills because the Indians could drive large herds of the animals to cliffs, or 'buffalo jumps' and the resulting slaughter provided stores of meat and hides in their winter camps. Farther south, hunting could continue all year.

On warm fall days, harvesting is often continued after sunset. Here in Alberta, it may continue quite late, but as soon as there is a temperature drop, moisture condenses, and stalks become too tough to combine. Harvesting ceases until the next day, and the time when conditions are again correct. Freeze-up may be as early as Sept. 15 in the grain fields of Alberta, or much later in warm years.
In the old days before machinery, of course, hand-cutting to stooking could go on until it became too dark.