Ditto on the above. Whidbey Island, WA doesn't get too cold - but we do have about two weeks (combined) of under freezing temps. The dangers are near-constant rain and 45+mph windstorms. Before I married by Navy husband, I was living in New England so I'm big on preparation!
Detail provided in case folks might be interested in minutiae and maybe get a few good ideas:
Yesterday I gave both coops a really deep cleaning, treated with DE as a preventative. I stood inside the coop for a bit with the outer doors closed up to check for any little holes showing daylight (two near the roof which hubby needs to fix tomorrow) and checked the skylight for leaks. Rain and subsequent flooding/leaking is a bigger problem here than cold, so that's a biggee.
I re-organized the coop so I can get to the first aid bin easier, checked that the infrared lamps are still good (two bulbs per coop, just in case one breaks) and oiled all the door hinges (our coop is separated into three sections - one for storage and two for birds, so I can separate if need be). I supercleaned the waterers (darn those things get wretched dirty) and checked the food bins for wear & tear. Hubby checked the electrical and made sure we have replacement cords, if need be. We also checked the batteries on the fire detectors after blowing the dust out of them.
I've been throwing down extra hay in the duck pens for them and have the bucket heaters ready and accessible. We have two pens, each needs a heater and a backup, so its time to start budgeting! Hubby went out and shook PVC the roofing out there to make sure its securely screwed down - we lost a panel in the last windstorm, thankfully it was in decent shape so we patched and re-installed it. My brother-in-law and hubby installed a bigger gate to the enclosure out there so I'm not knocking my knees stepping over the stuck gate anymore - its gorgeous and needs painting!
On each of the three brooder hutches, I cleaned and DE-treated. Hubby made me wind panels to cover the wire fencing sides and front to keep out the worst of the Winter. Checked the roofs and oiled latches and hinges. Fighting those in the cold really sucks, lesson learned last Winter. I also need to replace the handle, the metal knob is too small in the cold to grab wearing mittens. I have three cages I can use to re-locate the mammas and babies inside the big coop if the weather necessitates - otherwise, we have infrared lamps for those, as well.
Emergency supplies on hand: tarps, bungie cords, extra fencing, staples and cages stored up for emergencies. Caps are ready for the outdoor faucets. Extra hay has been brought in, we'll likely get a few more bales to put away in the mini-hay barn just in case.