noun
autumn foliage front; fall foliage front
Meteorological term for the advancing line of autumn leaf coloration across Japan, analogous to the cherry blossom front.
今年の紅葉前線は例年より遅れている。
This year's autumn foliage front is later than usual.
Cherry blossom front; the advancing line of cherry blossoms in spring, while 紅葉前線 refers to autumn leaves.
Compound of 紅葉 (autumn leaves) and 前線 (front, as in weather front).