What is the first frost?

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. Gregorian calendar 10 year1October 23rd to 24th is a holiday. After entering the first frost, the scene of late autumn is obvious, and the cold air goes south more and more frequently. The first frost does not mean "frost", but refers to the sudden drop in temperature and the large temperature difference between day and night. On the national average, "first frost" is the season with the largest temperature difference between day and night in a year.

The solar terms in the first frost mainly include enjoying chrysanthemums, eating persimmons, climbing high and overlooking, and tonic.