Do We Say Yaaleh Veyavo When Praying Maariv from Plag HaMincha?

Greetings,

Even when one prays the Maariv service for the night of Rosh Chodesh early, from plag haMincha, one does say Yaaleh Veyavo. However, on Motzaei Rosh Chodesh, if one prays Maariv early, before nightfall, one does not say Yaaleh Veyavo.

Sources: Regarding the Maariv service for the night of Rosh Chodesh, this is written by the Mishnah Berurah in Shaar HaTziyun (siman 693, small note 6), in Responsa Eretz Tzvi (siman 26), in Responsa Mishnat Yaavetz on the festivals (siman 2), in Responsa Teshuvot VeHanhagot, volume 1 (siman 87), and in Responsa Shevet HaKehati, volume 4 (siman 122).

Regarding the Maariv service of Motzaei Rosh Chodesh, this was likewise written in Responsa Shevet HaKehati there. It is also written in the book Aishei Yisrael (chapter 39, note 35) in the name of Rabbi Yehoshua Neuwirth, of blessed memory.

With blessings,

Hillel Meirs