Are they open in the winter

Yes they have a gorgeous laser light display during the cavern tour too! Be sure you dress warmly/check the weather if you aren't from the area!

I work there. We're open every day except Christmas and Thanksgiving. (Winter hours are 10:30-4:30 and summer hours are 9:30-5:30)

Yes

Yes they are ...its an event called christmas at de soto caverns

Yes😀 and they have Christmas events normally on the weekends