More than a quarter of Montgomery County elementary and middle schools failed to meet the “No Child Left Behind” achievement standards this year, according to results released Tuesday by the state education department.

Five middle schools entered a probationary “school improvement” phase, after failing to have met the federal “adequate yearly progress” standard, or AYP, for two years in a row. Nine of the county’s 38 middle schools are in improvement, along with Daly Elementary School.