Right To Information data has shown half of the students enrolled in TasTAFE hospitality courses in 2018 failed to reach completion in the North.
The figures were worse in the North-West where only 17 students completed the course when 56 had enrolled last year.
The data, released by Labor on Wednesday showed 434 students were enrolled statewide in 2018 but only 202 completed the course.
In the North, there were 201 enrolments and 119 completions.
Labor leader Rebecca White said the decline was a result of the government's failure to invest in training the state's tourism and hospitality industry.
"The tourism and hospitality industry relies on a strong flow of skilled local workers and the Drysdale training facility should be full to over-flowing with Tasmanian students being skilled for careers in hospitality," Ms White said.
She blamed increased TasTAFE course fees as the reason as to why completions had dropped.
Education Minister Jeremy Rockliff rubbished Labor's claim that student numbers were in free fall and said enrollments in all Drysdale courses had increased this year.
"What Ms White has failed to acknowledge is that Drysdale will have two more major intakes for hospitality statewide in 2019 and there will also be more enrolments to come across short courses including bar and hospitality skill sets," he said.
"Completion data only reflects students completing their qualification in that year it does not capture students who are part-way through their qualification."