Grasston is a city in Kanabec County, Minnesota, United States.

There were 63 housing units at an average density of 69.2 per square mile (26.7/km2).

18.9% of all households were made up of individuals, and 5.7% had someone living alone who was 65 years of age or older.

There were 46 housing units at an average density of 48.4 per square mile (18.7/km2).

19.0% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

There were 13.3% of families and 8.0% of the population living below the poverty line, including 4.8% of under eighteens and 71.4% of those over 64.