The first year I winterized mine (it's in MA) I had the tub faucet freeze and crack so I now do what Bob (rumbleweed) does and blow the lines out with my compressor after draining everything. I put a cup or so of non-toxic antifreeze in all drains so any water in the traps don't freeze, expand and crack the pipes.
My personal feeling is that, if you live in an area where temps go below freezing (at all), best to overdo your winterizing since the kinds of repairs freezing issues cause are very expensive/time consuming.
Phil
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