بسم الله الرحمن الرحيم
No doubt it is a rewarding deed to feed the poor and indigent people but the specification of the month of Muharram has no basis, there is no special virtue of doing isal-e-sawab in the month of Muharram as per the Shariah. You may feed in any other month as per your capacity, it is bida’h to fix the month of Muharram for it.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.