When is the first frost usually?

1, the time of first frost is Gregorian calendar1October 23rd-24th 10 every year, and the 24 solar terms are determined according to the position of the sun on the ecliptic. When the longitude of the sun is 2 10, it is the first frost.

2. The first frost doesn't mean "frost", but "frost" is the expression of cold weather and large temperature difference between day and night. Therefore, it can be said that the name of the first frost is only a metaphor when first frost means this season of "sudden drop in temperature and great temperature difference between day and night".