Depends on where in the Hudson Valley you live, altitude-wise. Down in Rockland County or up in the Catskills area? Usually sometime in October. You can have a frost and then go a month without one, so it's wise to cover or protect sensitive food crops or favorite annuals until frost is a regular occurrence. It can differ by weeks every year. The ground doesn't freeze solid till December, again, depending on the temps that year.

Lagrange going to try overwintering geraniums

Depends on what kind of geraniums. Annual? Perennial? They won't survive winter outdoors if potted or if annuals. You could try to grow them indoors for the winter in pots.

Annual there are many videos on youtube how. Last winter I experimented with 3. I removed all soil from roots placed in brown paper bag in beginning of Nov. Middle Jan I soaked roots for about 1 hour, let dry then put back in bag. March when I checked they started turning from brown to green, I potted them up.