According to the Websites these Haunted Houses are accessible.

Spooky World Presents Nightmare New England
Are you wheelchair accessible?
Yes, all of our indoor attractions are accessible and have wooden floors. Please note that our outdoor attractions have paths that are grass, gravel and woodchips.

Is a Military Discount offered?
Yes – we are proud to honor our past and present men and women offering service to our country. To receive a $7 discount per ticket, please show your Military ID at any of our ticket windows when purchasing. A Military ID discount may not be combined with any other coupons or offers.

Ghoulie Manor
Are you wheelchair accessible?
Yes, we are! If you don’t come with a wheelchair, you may need one by the time you leave.

Factory of Terror – Fall River, MA
Factory of Terror – Worcester, MA
Q. Is the Factory of Terror wheelchair accessible?
A. Yes, we have designed our attraction to make it wheelchair accessible.

Six Flags Fright Fest – Springfield, MA
Although the site does not  state it is Wheelchair accessible in the Plan Trip section it says: “7. Stop by Stroller Rental if you need a stroller, wheelchair, wooden stakes, silver bullets, garlic, or holy water.”

Canobie Lake Park Screamfest
Are the haunts wheelchair accessible?
Our haunted attractions can accommodate conventional and electric wheelchairs or electric service vehicles – although certain elements/effects will require the use of an alternate pathway. We do recommend, however, that you plan your visit with someone who is aware of your needs and can physically assist you when necessary.

Yes!  This year we are at the Memorial Auditorium which is wheelchair accessible. However, we can only make accommodations for our Thursday, Friday, Sunday and Wednesday shows.
Call 802 355-3107 two days in advance to make arrangements.

Note: You should call in advance to make sure their accommodations meet your needs.