That's what I do here in Akron Ohio. I don't trust just draining it, there may be a spot or two that still has water that could freeze and cause problems. I put antifreeze in mine for the winter and I like to fire it up every couple weeks whenever the temp gets around 40 degrees.
definitely do the antifreeze thing. I let one of my hemi`s freeze up one winter by draining the radiator and forgot about it. spent my vacation that next summer metal locking the block. It`s still running today, 40 something yrs later.