Starting to blow Shofar in Elul

Hi,

The normal custom is for synagogues to begin blowing Shofar on the 1st of Elul, which is the second day of Rosh Chodesh, and this is the practice which should be adopted by communities that do not have a set custom. However, communities which have a tradition of beginning to blow shofar on the first day of Rosh Chodesh should continue to observe that tradition.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:21:5)

Have a great day,
Mordechai