Council chiefs in Dumfries and Galloway were warned about the prospect of a blanket school closure four days before last week's strike action, according to a new report.
Some parents were only given half a day's notice of the shutdown.
A council report said concerns about keeping any schools open were raised on the afternoon of Friday, 22 September.
However, it was only after an emergency meeting the following Monday that it was agreed to shut all schools.
Dumfries and Galloway Council has apologised to parents for the impact of its late decision ahead of the three-day strike by Unison members from 26 to 28 September.
An urgent report into how events unfolded has now been tabled.
