De-winterizing timing

I'm watching the weather now to see if I need to do a more thorough winterization. We almost always do a trip south in late Feb, and just got back last weekend from a couple days at Sand Hollow, a week at Lake Havasu, a night at vegas to meet up with some friend there for the Race, and a night at Cathedral gorge state Park in Nevada. I blew out the water lines and drained the fresh water tank but didn't drain the hot water heater or dump any antifreeze in the P-traps. If the forecast is for a relatively cool day followed by mid twenties or lower for the night I'll go finish the job but my thoughts are I'll get away with it this year. It's getting to where we'll want to be doing long weekends pretty soon.