Reading some of the threads about pool closing made me realize I've never blown the water out of the main drain pipe since the pool was installed in 2004!

I've blown out the return lines, waste line, and pool cleaner line. Didn't know I could blow out the main drain line until I read here how others were doing it (duh!).

So my question is, have I just been extremely lucky I've never had freeze damage to that line or do I really need to blow out the main drain line?

I live on the southeast VA coast where temps rarely stay below freezing. It can occasionally get down into the teens, but never stays there long enough for the ground to freeze really hard. We can occasionally get a big snow (6"-12") every few years, but it doesn't stick around long. Since the water level in the pool is below where the main drain line meets the gound at the other end, I'm guessing the ground has kept it warm enough to prevent freeze damage?

Feedback is appreciated.