Looking at the FAA TFR site (http://tfr.faa.gov/tfr2/list.html) I can only view current or future flight restrictions. Does anyone know of a resource where I can find past flight restrictions?
As you know, a TFR is published in FDC NOTAMs, so you can use the FAA's NOTAM search tool's "Archive" mode to search for past TFRs issued via FDC NOTAMs.
Use this link (https://notams.aim.faa.gov/notamSearch/nsapp.html#/). Press the Location button on the left and select "Archive Search." Then select a Date and Location designator to search for the NOTAMs (including TFRs) in effect on that date in that area.
By way of example, I did a search for Riverside Municipal Airport (KRAL) on 2/2/2016, and it returned these old NOTAMS (included TFRs). See the California Speedway TFR.