Missing Crows :)
I actually live just across the Canadian border in BC but it’s probably the same :) we have had a Crow family living in our yard for years but this October they all left . Like not a crow anywhere? Any idea what happened? Do they fly south some years ?
Crows often congregate in winter in areas where there is food and roost areas available. It may be that your family joined a winter congregation. In some cases birds seem to leave an area for a while and then may return later. Some instances birds have left an area for over a year before returning.
I am including the URL to a fact sheet on crows. It may have information of interest to you. If you have additional questions, get in touch with eXtension.