First Strong Cold Front!!!!!

For all you who have been praying like I have for a good strong cold front I think our prayers have been answered!! For the last couple of days we have been see in a lot of birds coming from the north and a lot of them as George Washington would say " Them's Big Ducks Son!!! "... I'm a firm believer that your bigger concentrations of ducks do follow the frost line... What I mean by that is at night the temp drop below freezing and then rises back above freezer during the day which keeps the shallow feeding water open... I got one question do you guys like to hunt before or after a good strong front?