Don't worry it's not like in England where we are lucky if the snow lasts a week.
Take a look at the web cam
www.borovets-pms.com/video.php
There is enough snow showing on the lower slopes to last weeks, especially with the snow cannons to top up. I'd say there is at least 50 cms there at the moment. There is usually skiing on the top into April, where there are also beginner slopes.
You will have lots of lovely snow, so relax and enjoy when you get there
fist time to borovets... been to france twice before snowboarding had a great times but very expensive when you get there. cant wait till next sunday looking forward to borovets..