Instead of asking for the best season for all of China, ask which part of China will be at its best during your available time.
Spring: fresh green and flowering villages
Southern mountains and old villages unfold gently in spring, though it is wise to leave room for rain and damp weather.
Summer: trade city heat for plateaus and valleys
Move toward southwestern highlands, northern grasslands, or cooler elevations and the journey becomes far easier.
Autumn is not only about leaves
Northwestern light, Jiangnan temperatures, and southern harvests make autumn a strong season for longer routes.