24255 N Hwy 21
Vernon Hills, IL 60060
The entrance is on Route 21 (Milwaukee Avenue) at the stoplight of Woodlands Parkway, south of Route 60 (Townline Road) and just north of Route 22 (Half Day Road).
In the early 1960s, these acres were some of the first we acquired. The old farm fields west of the river remained fallow for many years until Half Day was developed in the late 1980s. This preserve was named for Potowatomi chief, Aptakisic, whose name means “sun at its meridian” or “half day.”