If you're into fall fruit, this is the place to go.
Montgomery Place is an estate located on the Hudson and for nearly 200 years there have been, among other things, orchards with a wide variety of fruits. The farm stand is not on the estate itself but rather about a mile away on Route 9G right next to the traffic.
I was over at the farm stand two weeks ago and had the opportunity to talk to the farmer. She said that they had 60 varieties of apples, mostly heirloom, and various other types of fruit. Today I bought two varieties of apples, chestnut crab apple (a crab apple in name only--it could be eaten out of hand, had somewhat of a sweet taste, and the texture reminded me chestnuts) and a Cox's orange pippin (haven't tasted yet). Also I got some bartlett pears (tasted like nectar, wear a bib), grapes (a gush of sweetness followed by tannin from the skin and then a mixture of the two) and raspberries.
Besides fruit, they also have veggies from their farm as well as nearby ones.
This is definitely worth a visit from people who live in the Valley as well as visitors who come for American (and Dutch) history, leaf peeping, wine trails, music and art performances, or just want to get away from it all.
PS--They do not have "pick your own".