Nathan Beane, of Vicksburg, practices treeing squirrels with Katie, his 1-year-old mountain cur. Squirrel-hunting season opens today in Warren County. The 2012-2013 squirrel hunting season opens today and lasts through Feb. 28. The limit is eight squirrels per day, and the Mississippi Department of Wildlife Fisheries and Parks reports squirrel populations are expected to be abundant throughout most of the state.