Do hot water or cold water lines freeze first?
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If a line freezes, I don't think it really makes any difference. Where the water comes in the house would likely be the first. Any lines that are exposed to the cold could freeze and then come up the pipe. We had lines in the basement that would freeze in a turn of the century house that had a completely unfinished basement that would get really cold in the winter. When we did laundry the basement would actually fog up. Occasionally the water pipes to the washer would freeze up, but never in the main house.
The hot water that stays in uninsulated pipes cool quickly, so it becomes a matter of which one gets to 32 degrees first.
Cold, but you should lag so they don't.both
Cold, usually freezes first. I leave my lower level bathroom sink dripping, when it gets really cold.