Unfortunately due to days of rain we will be unable to open our doors until Saturday October 3rd at 7:30 p.m. Our customers and staffs safety is of peak importance to us. Thank you for understanding.

🎃 Ten nights of frights this Halloween season!Sinister Sidney will be open Fridays and Saturdays this October (including Halloween!) from 7:30 – 10:00pm, weather permitting.We are an ages 12+ outdoor haunted attraction so dress appropriately for the weather.Tickets are $20 at the gate. 🎃.#sinistersidney #getsinistered #hauntseason2026 #hauntedhouse #iowahaunters #midwesthaunters #southwestiowa #Halloween

Sinister Sidney proudly hosts the 1st annual Operation Krampus—a chillingly cheerful effort to support the Fremont County Deputy Association’s Operation Santa. Every toy and cash donation from this event goes directly to the Association once the snow settles. 🎁 Bring a new, unwrapped toy and be entered for a chance to win two 2026 Sinister […]

Sadly another season has ended, the door is shut, the screams gone silent, and we say thank you to every patron and actor that made this season one of many memorable ones!! Without any of you, we couldn’t pull this off every year!!! However, our door may be shut till next season but this definitely […]