We purchased season tickets in June or July. What would our cost be for Christmas lights? And what about guests?

Not very cost friendly. Better off doing the Zoo Lights

If you have season tickets it includes the seasonal openings but if you don't have season parking pass it will be $12 for parking

Parking was 7 dollars, not 12.

Your season pass covers it for you and has a half off buddy ticket

For each season pass, there are perks including bring a buddy pass in the summer for each month and for the Halloween and the Christmas lights. This year, 2017, the cost is $10 to bring a friend which is a lot cheaper than having to pay out of pocket. Also online prices tend to be cheaper. Hope this helps. They're open 5 to 10 p.m. from today, Friday December 29th 2017, through Sunday December 31st 2017.

Guest can be as low as 5 dollars (one 5 dollar companion ticket per season pass holder).

Free for the pass holders