Water, then heat, then everything else
Spokane does not have a hard winter so much as a repetitive one. Temperatures cross freezing and back again over and over from November through March, and it is that crossing — not the cold itself — that does the damage. Water gets into a gap in daylight, freezes overnight, expands, and makes the gap slightly bigger. Then it does it again. A hairline crack in September is a real crack by April, and the same mechanism is behind ice dams, spalled concrete, split hose bibs, and most of the roof leaks that show up in a thaw.
That gives you a priority order, and it is not the order most autumn checklists use. Anything that controls where water goes comes first, because every freeze-thaw cycle it survives is damage that does not happen. Heat comes second — a furnace that fails in January is miserable and expensive, but it is a one-off, not a compounding problem. Everything else can wait for spring.
The other reason to move in September: the trades are not busy yet. The first genuine cold snap generates a week of emergency calls, and from that point you are competing for the same crews as everyone else, at emergency rates, for work that could have been scheduled.
Everything that decides where water goes
Gutters and downspouts are the highest-value hour you will spend on the house. Full gutters cannot drain, standing water freezes, and the ice that forms at the eave is what backs meltwater up under the shingles. Clear them after the leaves are actually down — late October is usually the real window, not September — and check that every downspout carries water away from the foundation rather than dumping it beside it.
Walk the roof edge from the ground with binoculars. You are looking for lifted or missing shingles along the eaves and in the valleys, and for flashing that has pulled away around chimneys and vents. Those are the entry points that matter, and they are cheap to fix in September and expensive to fix through eight inches of snow.
Disconnect the hose from every outdoor bib and shut off the interior valve if the bib is not frost-free. A hose left connected traps water in the fixture; that water freezes, splits the pipe behind the wall, and you find out in the spring when it thaws and runs. It takes two minutes and it is the single most common avoidable winter plumbing failure in older housing stock.
Last, look at grade and drainage close to the house. Soil that slopes toward the foundation, a window well with no drainage, a downspout ending in a splash block that has drifted out of position — each one puts water where it will freeze against something structural.
If you only do one thing: clear the gutters and get the downspouts pointing away from the house. Almost every expensive winter surprise starts as water that had nowhere else to go.
Service the furnace before you need it
A furnace that has sat idle since March will run when you turn it on in November, which is exactly why people skip this. The failures that strand you are not the ones that stop it starting — they are a cracked heat exchanger, a failing inducer motor, or an ignitor on its last few hundred cycles. Those get found on a service call in September and get found by a cold house in January.
Change the filter, and if you cannot remember the last time you did, change it now and again mid-winter. A clogged filter makes the furnace work harder for less heat and is the cheapest possible thing to get wrong.
If your system is a heat pump, the autumn check has an extra item: make sure the auxiliary or emergency heat actually engages. Heat pumps lose capacity as the temperature drops, and Spokane gets cold enough that backup heat is doing real work several weeks a year. A backup element that has quietly failed is invisible until the week you need it most.
While someone is out, ask them to look at the venting and the CO detectors. Combustion appliances and a sealed-up winter house are the combination that makes carbon monoxide a genuine risk rather than a theoretical one.
When to do what
Rough sequence for an average year. Pull everything a few weeks earlier if the forecast turns.
Things that are fine to leave until spring
Exterior paint is a spring job — it needs temperatures most autumn days here cannot hold through the cure, and a coat applied too cold fails early. The same goes for sealing a driveway or a deck.
A full roof replacement is worth planning now and scheduling for spring unless the roof is actively leaking, in which case it is not a winter-prep item at all, it is a repair. Tear-offs happen in cold weather routinely, but you have more negotiating room and better crew availability outside the rush.
Cosmetic work — interior painting, flooring, anything that does not touch water or heat — is genuinely better in winter. Crews are less booked and you are indoors anyway.
The questions homeowners ask us most
When should I get the furnace serviced in Spokane?
September, before the first cold snap generates a week of emergency calls. A furnace will usually start fine in November — the failures that strand you mid-winter are the ones a technician finds on an inspection, like a cracked heat exchanger or a worn ignitor, not the ones that stop it running on the first try. Booking early also means you are scheduling at normal rates rather than competing for the same crews as everyone else.
Do I really need to disconnect outdoor hoses before winter?
Yes, and it is the most common avoidable winter plumbing failure in older houses. A connected hose traps water inside the bib and the pipe behind it. That water freezes and expands, splits the pipe inside the wall, and the split does not announce itself until the thaw — at which point it runs behind your drywall. Disconnect every hose, and on any bib that is not frost-free, shut the interior valve and drain the line. It takes two minutes per fixture.
What causes ice dams and can I prevent them?
Heat escaping into the attic melts snow on the upper roof; the meltwater runs down to the cold eave, refreezes, and builds a ridge of ice that backs the next round of meltwater up under the shingles. The durable fixes are attic insulation and ventilation, because they keep the roof deck cold enough that the snow does not melt unevenly in the first place. The autumn stopgaps are clear gutters and sound flashing at the eaves and valleys, which decide how much damage a dam does when one forms.
Is it too late to book work in October?
For most of this list, no — gutter clearing is genuinely better in late October once the leaves are down, and furnace service is still bookable. What gets hard in October is anything on the roof, because availability tightens as soon as the weather turns and a repair that was routine in September becomes a scheduling problem. If you know you need roof or flashing work, that is the one to call about first.