Missouri to Fairbanks in October.... that will be a shock.
I'm a lousy bird hunter, so can't help too much. Very few people hunt with dogs here, although it does happen. I think you will find that the majority of birds here are taken with .22's.
We have all types of birds though, so no shortage of options. Locally, Spruce and Ruffed grouse are in the timber and accessed from the logging roads and ATV trails. We have some Sharptails down by Delta Junction too, although I've never hunted them. Ptarmigan are in the tundra and willows on the local "domes" or out in the White Mountains. My kid collected a few of those on Sunday and we had them for dinner last night. They are stuffed with berries this time of year and good eating.
The Ptarmigan hunting goes all winter, so if you don't mind the cold and short days there is no such thing as "too late" in the season.