Yup you are really pushing it now. If you had gone this year at that time then the answer would have been NO sorry but it is really a lottery at that time of year.
personally i would go back to travel agent and bring date forward as this date is too late for a resort so far south in europe with such a low altitude.if you are restricted tothis date then go to bansko as the skiing is at a higher altitude.
I would add that when I went in 98 and 99 in March (14th) there was loads it hardly stopped snowing so would have been more than enough to last. But my last 2 visits at this time have not been so good.