You should probably call them at 860-409-9100. The people operating the store are more likely than anyone on this website able to tell you if they are open. Since it is a chain, the experience at this location is likely to be exactly the same at other locations.

Here’s one thread talking about Five Guys.

http://roadfood.com/Forums/topic.asp?TOPIC_ID=7551&SearchTerms=five+guys

Do a search and you will find 3 or 4 other detailed threads. Good Luck.