It is probably a little premature to be thinking about subzero temperatures. However, there is a record of subzero temperatures in our region in October. The earliest subzero temperature on record in Fargo-Moorhead was on October 26, 1919. There were three inches of snow on the ground, and a clear sky allowed the temperature to sink to -4 degrees. The following night, it was 6 degrees, and then it was -2 on the 28th.
In Grand Forks, the snow was five inches deep and there were four consecutive nights below zero starting with -1 degrees on the 25th. The following three nights were -9,-2 and -8. High temperatures through this period were in the 20s at both locations. This cold snap is the only subzero temperature record in October for either location. The average first subzero temperature for the period of record is November 27 for Fargo-Moorhead and November 24 for Grand Forks.