Q. See question above: The same individual who protested my blowing shofar in shul, told that besides it was already late and one should not blow the shofar at night. Is that correct? Can one training to blow the shofar for Rosh Hashana do so at night?

A. On question 59 we wrote: “I’m learning to become a Baal Tokea but the friend teaching me can only do it at night is that OK?

Aruch Hashulchan (581: 12) rules that one should not blow the shofar at night, since it awakens negative awakenings and intentions, even if his purpose is only for learning.”
Mekor Chaim (591), Moed Lechol Chai (11: 51) and others (See Nitei Gavriel 4: 12) also mention to abstain.

However, from Magen Avrohom ruling that one should not blow the shofar on the night before Rosh Hashana, it seems that otherwise it is permitted
Horav Shlomo Miller’s Shlit”a opinion is that you may blow at night the shofar for learning purposes.

Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a