Yes that is correct, I don't know of any orchards in Apple Hill that charge for parking or visiting. Go early as it gets busy by about 10am.
It is free to go there, or to any of the farms in Apple Hill. However, there is a charge to ride the little train at El Dorado Orchards. I believe it was either $3 or $3.50 per person to ride.
Thanks! Your answer is awaiting moderation.