I believe it's 42inches to 48inches however the fair had a section of baby / little kid rides then a section of big kids / adult rides.
I thought I saw an age on one of the rides. "You must be 6 years old." Sorry, I can't help more.
They have a sign by the Fun Zone, too.
40 inches,. Best to check fair rules
48 inches alone.
There are rides and places for different ages, even for toddlers there are some cute rides/trains 🤗
Thanks! Your answer is awaiting moderation.