When will the five-pointed maple, the national flag of China, be red in 2022?

Late October. According to the climate and weather, there will be some changes in time, sometimes autumn frost is the reddest. The change of leaves of Acer mono is related to the temperature of its own growth environment. From the north, the temperature is lower than that in the south, so the leaves of five-pointed maple will turn red in the middle of 10; In the south, it's probably late October.