Ice In Definition

In Minnesota, an "ice-in" date is when a lake is frozen over with a continuous and immobile ice cover for the first time that season. This date is determined by observers and is not based on a specific thickness, but rather on the first full, unbroken freeze that lasts more than a day. View DNR data here: https://www.dnr.state.mn.us/ice_in/index.html?year=2025#map