Here is how the past 2 years went.
Here’s a recap of the extension history over the past two years (2016-present):
Feb 18, 2016 - open thru Nov 4, 2016
May 19, 2016 - open thru Jan 4, 2017
July 7, 2016 - open thru Mar 8, 2017
Aug 4, 2016 - open thru Apr 24, 2017
Nov 1, 2016 - open thru May 8...