The hill
There's one hill in Morton that I know of for sledding and I took our kids there yesterday. They all absolutely love it. It was the highlight of their day. I think we stayed there for a couple hours and my older two actually road together and carried the sled up the hill by themselves while I went down with our littlest. It worked out well. The hill is at Northwoods Park in Morton and it's on the north side of town.
At first, I was wondered if I made a bad decision by taking all three kids by myself, but it worked out great. They had a good time. No one got hurt and we really didn't have much complaining. I consider that a win. And we got outside for half of the day in February! Yes. That's a win.
If you haven't gone sledding at Northwoods Park and you have little kids go sledding at Northwoods Park. They'll love it.