Only wkends. And I think it's closed for the season now.
As Tracey mentioned, they are only opened on weekends. I thought they were closed for the season but it appears that they were open last weekend. It doesn't appear that they have updated their site yet but keep checking as they usually do so towards the end of the week http://www.driveins.org/wv-athens-pipestem.htm
It's not open on weeknights and I am unsure about this coming weekend.
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