There is no separate charge for the haunted attractions. A season pass can be used for admission to Dorney Park and includes all attractions.
Yes you can use your season pass for the haunt. I've been a passholder for 10 years and I go every year, as a matter of fact I'm going tonight and I went 2 weekends ago. You can also get friends and family in for $30 at the gate
I believe that is a separate charge for the haunted attractions
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