When do you take your snow tires off?

Funny because my snow tires some how have LOTS of tread still. I know, I know, they “should” be wearing down. But honestly mine still look really fucking good and this i my second winter with them and i bought them used. I have been rockin mine since October. Still have them on. I was just waiting for the right time to get the tires taken off. Now im waiting for them to come back from powdercoating. I can’t wait to have a solid tire on the car again.