I fish the Hudson, about 80 miles north of the City. The last couple years I've keyed on fishing the fall for resident stripers and/or migratory bass going either way and have caught a bunch in the 18-30" range. Not big numbers and challenging to target, but they are there. As I understand it, there's a number of theories about striped bass in the Hudson outside of the spring spawning run:
1. Juvenile bass that were spawned in the Hudson stay there year round up to age 3 before migrating back down to the salt
2. There is a small resident population of bass that stay their whole lives in the Hudson, including large adults
3. A indeterminate number of bass move in to the Hudson to winter over as alluded to by RJ
The wintering contingent of bass is interesting to me. Several rivers in Connecticut are known to hold huge numbers of wintering stripers that can be targetted and caught. The Hudson river water by me (Kingston area) is fresh - the salinity line is anywhere from 20 to 40 miles south of here. But I've heard reports from credible fishermen of bass up to 40" being caught Thanksgiving weekend north of here, and of guys in the know catching numbers of bass up to 20lbs at the Troy dam north of Albany end of October on bucktails. Alot of this stuff for the fishermen up my neck of the woods is something of a mystery as very few people do it. Very few guys fish the fall striper run (if it even exists) and most guys think it is mythical and you can only catch stripers in the northern Hudson in the spring - but there are fish there. Of course the further south you go i.e. Tappanzee, Croton, Piermont area, the more bass there are in the late fall.
RJ, I'd love to know what general area of the Hudson you fish. Nice to see another Hudson guy on here.