We are heading down in January/February 2018...it's our first time not going in May or another "prime" month, so we aren't very well versed in short park hours. I know they do adjust park hours sometimes, but not probably as much in the down season. All that said, MK shows an 8pm park closing. I know HEA is currently at 9pm. If MK does close down at 8pm, when will the fireworks be?
