If you're in an area where you get long-term snow cover, you might want to go short (1.5 inches) to reduce the chances of snow mold.

If not, you can really mow at any height you like. Here, with no long term snow, I stay at 3 inches. My mother prefers 2 inches. Both are just fine.

Thanks. We do have long-term snow cover usually. A cold winter is predicted, so I imagine that will be the case again this year.