The F100C seems to put the image , at its earliest, as 1955. Cole Palen didn't acquire Old Rheinbeck until 1959 , however the aircraft were reportedly stored near Poughkeepsie in NY State.( Note that the SPAD ( an XIII) and the 504 are not those examples latterly in the collection.)
Re the probable B-29 in the centre background. It might be that it has its bomb doors open
Perhaps identification of the large building on the hill in the distance could clinch the airfield's location?