I wanted to bring to your attention something I learned about recently that might be of interest to you. Local and national humanitarian organizations help coordinate "gleanings" in the fall to distribute food to the poor or needy.
For those who have never heard of it before (like me), gleaning is the act of collecting leftover crops from farmers' fields after they have been mechanically harvested or on fields where it is not economically profitable to harvest [from Wikipedia].
The Society of St. Andrew seems to be the biggest national organization that is looking for volunteers. If you are looking for a sectarian or more local organization, here are a couple that may be near you: