I've got some bread flour that has been in the refrigerator that has a best use date of Sept. 2015, and it's now Nov. 2015, is it okay to still bake with it?
The purpose of "best used by" date, on most products, is an indicator of freshness, as opposed to safety. Of course, things like temperature, light...storage conditions in general, also impact product quality. So there are several variables to consider. As pointed out above, give it a look, give it a smell...if it passes those tests give it a try.