Labor says parents "remain in the dark" about proposed new school intake areas.
However, the government argues parents will stay be able to enrol their children in schools out of area.
Labor's education spokesman Josh Willie said many parents did not about the proposed changes and "they need to have a say".
Rebecca Churchill, a parent at Risdon Vale Primary in southern Tasmania said she only found out about the changes " a couple of days ago on Facebook".
"We had absolutely no idea about it," Ms Churchill said.
"It is a really big concern because if we have less students we get less funding and less support."
Mr Willie said parents across the state were in the same position.
"Every primary school has a new intake zone proposed and for some it is quite significant and for others it is minor," he said.
"These changes only happen every five years so it's vital that all families who will enrol their child in 2021 are made aware.
"All parents are passionate about their children's education and part of that is making decisions about the school they will attend."
Mr Willie said consultation closed on Friday September 27 and the government should say how many submissions have been received for the 126 primary schools and 25 combined (district) schools and if necessary extend the consultation on "these big changes to continue the conversation with families and students".
Education Minister Jeremy Rockliff said the processing for enrolling in schools would "remain the same".
"Parents will still be able to apply to enrol their children out of area should they choose to do so," Mr Rockliff said.
"This Government has always been about respecting parent choice.
"An absence of education policy does not give Labor the right to spread fear among school communities in an attempt to scare parents."
Mr Rockliff said the intake maps had not been updated since 2005 and parents and communities were being widely consulted.
"To be clear, consultation with parents, schools and the community has been extensive and is ongoing," he said.
"Our expectation is that for many schools there will be minimal or no change to boundaries and where there is change it will reflect such matters as geography, parent journey to work and bus routes."
The Education Department has placed advertisements in newspapers about the review of school intakes and written to parents inviting feedback.