School District of Onalaska - Onalaska, WI - Northern Hills Calendar https://www.onalaska.k12.wi.us/pro/events_rss.cfm?detailid=445173 School District of Onalaska - Onalaska, WI - Northern Hills Calendar en-us 1st-5th grade First Day of School - September 4, 2018 https://www.onalaska.k12.wi.us/pro/event_view.cfm?eventid=607330&memberid=136 Tue, 04 Sep 2018 Prek & Kindergarten Orientation - September 4, 2018 https://www.onalaska.k12.wi.us/pro/event_view.cfm?eventid=607331&memberid=136 Tue, 04 Sep 2018 Prek & Kindergarten First Day of School - September 5, 2018 https://www.onalaska.k12.wi.us/pro/event_view.cfm?eventid=607332&memberid=136 Wed, 05 Sep 2018