month-end soba; year-end soba
Soba noodles traditionally eaten on the last day of the month, especially on New Year's Eve (大晦日).
There is a custom of eating year-end soba on New Year's Eve.
Month-end soba is enjoyed as a good-luck charm at the end of the month.
年越し蕎麦 specifically refers to soba eaten on New Year's Eve, while 晦日蕎麦 can refer to soba eaten on the last day of any month.
Standard kanji spelling for this traditional year-end soba.
Alternate spelling using 三十日 (30th day) to represent 晦日.
Mixed kanji-kana spelling; そば is often written in kana.
From 晦日 (misoka, 'last day of the month') + 蕎麦 (soba, 'buckwheat noodles'). The exact origin of the custom is uncertain, but it is associated with wishes for longevity and financial prosperity.