Every year Ive dug its varied as far as how many,what age, and location of the majority. With that said no matter how dry,wet, or whatever the conditions of the season I have always been able to find seng until Oct 15th. I know for sure thats the date cause the 14th is my dads B-day. Its odd though cause as hard as Ive hunted Ive never found 1 single root after that date!