Where are some good sledding hills for young kids in NW Denver?

Lakeside was always a good place to sled, but I'm not sure if they allow that anymore. But I would just drive around and find a hill somewhere. We live about 25 miles north of Denver and you can always find a place. You kind of have to get away from the city to find somewhere to sled, unless it's a park. Good luck! I know Westminster Rec Center has a pretty big hill that people always go sledding at! Same with Thornton Rec Center.