Particularly since the Edo period, the term setsubun (or sechibun) has been often used to specify the day before risshun (the first day of spring, around February 3 of every year except February 4 for leap years).
特に江戸時代以降は立春（毎年2月3日ごろ、うるう年は2月4日ごろ）の前日のことを指す場合が多い。