To record the most recent Opportunity close date on Contact records and ensure the field is overwritten every time a new Opportunity meets the criteria, use NPSP Customizable Rollups:

NPSP Customizable Rollups: This feature allows users to define rollup fields that aggregate data from related objects (e.g., Opportunities) to a parent object (e.g., Contacts).

Most Recent Opportunity Close Date: Configure a rollup summary to track the most recent close date. This ensures the field on the Contact record is updated whenever a new Opportunity with a qualifying close date is added.

Using NPSP Customizable Rollups ensures the process is automated and tailored to nonprofit needs.