Built in 1810, DECKER FARM is New York City’s oldest, continually working, family farm. Decker Farm contains 11 rolling acres of wide-open farm fields and hosts fall events every October. It is one of Historic Richmond Town’s four sites, now preserved and maintained as a New York City landmark by Historic Richmond Town. Oct. Weekends & the 1st Monday in Oct. 11 am - 5 pm | 435 Richmond hill rd. Pumpkin Picking at Decker Farm is fun for the entire family! Pick a pumpkin to take home, enjoy an old-fashioned hay ride, delicious fall treats, and activities for guests of all ages! This picturesque historic site opens annually on weekends in October!