What is the solar term for the first frost in a year?

The first frost indicates that the weather is getting colder, and first frost begins [1], which is the 18th of the 24 solar terms. At the end of September each year (1October 23rd or 24th 10), the first frost is regarded as the last solar term in autumn when the sun reaches 2 10.

"Twenty-four solar terms" said: "In mid-September, the gas is cold and condensed, and the dew is like frost." At this time, when the temperature drops below 0 degrees, the water vapor in the air condenses into white crystals on the ground, which is called frost. The first frost refers to the first frost. Plants that are not hardy will stop growing and present a scene of late autumn, which is a good time to enjoy maple leaves.

The first frost is between1October 23rd and 24th 10, and the sun is at 2 10.