All Boston public schools will be closed Tuesday and Wednesday as a massive blizzard was expected to blanket the city with up to three feet of snow, Mayor Marty Walsh announced Monday afternoon. School was open Monday, but all after-school activities, sports and adult education classes were canceled.

The blizzard, named Winter Storm Juno by the Weather Channel, was expected to dump 20 to 30 inches of snow on the greater Boston area. Massachusetts Gov. Charlie Baker declared a state of emergency, and transit officials announced trains would shut down at midnight, BostInno reported.

Administrative offices for Boston Public Schools, including welcome centers, the Newcomer Assessment and Counseling Center, Campbell Resource Center and the 26 Court Street headquarters, also announced they would not be open Tuesday. Despite these closures, parents will still be able to drop off their children aged 7 and older at the Boston Center for Youth and Families starting at 7:30 a.m. They must be picked up by 6 p.m., according to Boston Public Schools' website.

Institutions of higher education were also preparing to shut their doors ahead of the storm, which was expected to hit Boston late Monday and continue through Wednesday morning. The University of Massachusetts' Dartmouth campus announced it would close Monday at 4 p.m. and reopen Wednesday at 5 p.m. Harvard University, in Cambridge, has suspended operations Tuesday for non-critical staff, according to its website. The Massachusetts Institute of Technology, also in Cambridge, will close at 7 p.m. Monday, remain shuttered Tuesday and reopen Wednesday at 7 a.m.

Several private schools in the area canceled classes, as well. The International School, Boston College High School, Beverly School for the Deaf, Gifford School, Milton Academy and Trinity Christian Academy were among private institutions due to be closed Tuesday, CBS reported. See a full list of closures here.