MADISON, Wis. (AP) — Election season is starting early in Wisconsin.

Voters will fill three open seats in the Legislature over the next two months. Primaries are set for Dec. 19 with the general elections scheduled for Jan. 16.

Republican Reps. Adam Jarchow and Shannon Zimmerman and Democrat Patty Schachtner are vying to replace Republican Sen. Sheila Harsdorf. She gave up her seat this month to become state agriculture secretary.

Democrats Greta Neubauer and John Tate II are running to replace incumbent Democratic Rep. Cory Mason. Mason plans to resign Jan. 15 after he was elected mayor of Racine.

Three Republicans — Spencer Zimmerman, Steve Stanek and Tiffany Koehler — along with Democrat Dennis Degenhardt and socialist Christopher Cook are looking to fill Republican Rep. Robert Gannon’s seat. Gannon died in October.