Yerkes Observatory

373 W. Geneva Street
Williams Bay , WI 53191
phone: (262) 245-5555
>> map and directions

Largest refracting telescope in the world.
Yerkes Observatory offers free 45-minute public tours every Saturday throughout the year beginning at 10:00 a.m., 11:00 a.m., and Noon. We appreciate donations. We don’t take reservations. If there are more than fifteen in your group, please consider making arrangements for a private program at some other date and time.  Yerkes offers opportunities several times every month throughout the year for people age twelve and up to observe with a two-foot diameter telescope, weather permitting. The charge is $25.00 per person. Call 262 245-5555, extension 832 for dates and to make a reservation.