A crime punishable by imprisonment in the Wisconsin state prisons is a felony. Every other crime is a misdemeanor.
Wis. Stat. § 939.60
When a statutory offense does not specify a place of confinement, a sentence of one year may be to either the county jail or the state prisons. All crimes punishable by imprisonment in the state prisons are classified as felonies. State ex rel. McDonald v. Douglas County Circuit Ct. 100 Wis. 2d 569, 302 N.W.2d 462 (1981).