From the north: Go south on I-94, exit at Half-Day Rd (IL 22). Turn right and go west to Riverwoods Rd. Turn left and go south to the entrance.
From the south: Go north on I-94, exit at Deerfield Rd. Turn left and go west to Saunders Rd. Turn right and go northwest to the entrance.
Once you're inside the entrance to Ryerson Woods, proceed along the entrance road past the farm area. Continue to the end of the entrance road into the parking lot of the Welcome Center. See the map below.
The Ryerson Woods web site has a map. Click on "Directions" under "Maps".
Ryerson Woods Welcome Center
21950 N Riverwoods Rd
Deerfield, IL 60015
Longitude: West 87.91556° = 87° 54′ 56″
Latitude: North 42.18194° = 42° 10′ 55″
Altitude: 200 m = 656 ft