Teachers across Derbyshire will go on strike next month.
Staff will walk out on October 1 in a row over pay, pensions and workloads.
The National Union of Teachers (NUT) and the NASUWT accused Education Secretary Michael Gove of being “reckless and irresponsible”.
Deborah Turner, of Derbyshire NUT, said: “Teachers don’t take this type of action lightly.
“We have ongoing issues and time and time again we’ve called on Mr Gove to enter into dialogue with us.”
Action is planned across the country throughout October with a possible co-ordinated national strike later in the year.
NASUWT general secretary Chris Keates said: “No one wants to be disrupting children’s education.
“Our experience is parents understand that if you attack teachers’ pay and conditions you are putting at risk children’s education.”
Mr Gove questioned why the unions were pursuing strikes.
He said: “There is no excuse for going on strike.
“What is the complaint that teachers have? Is it that pensions are poor?
“It has been pointed out that even after recent changes, teachers have better pensions than the majority in the public and private sectors.”
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