Indian Summer' Site

In 19th-century American English, "Indian" could prefix something spurious or imitation (e.g., "Indian corn" for maize, not wheat). "Indian Summer" would then mean a "fake summer." This is plausible but not definitive.

In colonial folklore, Native Americans were seen as master weather forecasters. A warm spell in autumn was called "Indian Summer" because Indigenous peoples had predicted its arrival.

Many early American writers, including J. H. St. John de Crèvecœur (1780s), noted that Native American tribes used this warm window to finish harvesting crops (especially corn, beans, squash) and to conduct final hunts for deer and small game. The warm, still weather and soft light were ideal for hunting before heavy snows. The haze also made it harder for prey to detect hunters.