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Washington Winter Weather 2026/27: 10 Steps Before December Snow
Seattle, WA – A powerful December winter storm could leave Washington residents facing snow covered highways, frozen plumbing, dangerous wind chills and power outages lasting several days. With winter
By Claire Benton · 2026-11-15T17:53:30.506Z
Seattle, WA – A powerful December winter storm could leave Washington residents facing snow covered highways, frozen plumbing, dangerous wind chills and power outages lasting several days. With winter 2026/27 approaching, homeowners across Seattle, King County, the greater Seattle metropolitan area and communities throughout Washington should prepare before heavy mountain snow, freezing rain, strong winds and extreme cold threaten their homes.
According to winter safety guidance from the National Weather Service and Washington Emergency Management Division, winter storms can produce significant snowfall, hazardous ice accumulation, dangerous wind chills and widespread transportation disruptions. Western Washington faces risks from freezing rain, heavy wet snow and damaging winds, while eastern Washington and the Cascade Mountains can experience substantial snowfall, prolonged freezing temperatures and blizzard conditions.
Here are 10 critical steps Washington homeowners should take before December snowstorms and extreme cold threaten their properties.
1. Inspect Your Roof Before Heavy Snow Accumulates Washington roofs can experience substantial snow loads, particularly when repeated storms produce heavy, wet snowfall.
Inspect shingles, flashing, gutters and attic spaces for existing damage.
Homeowners in Seattle, Tacoma, Bellevue and Everett should check aging roofing materials and blocked drainage systems.
Residents in Leavenworth, Cle Elum, Winthrop and other mountain communities should pay particular attention to repeated snowfall and uneven roof accumulation.
Homes in higher elevation areas may experience substantial snow accumulation, creating additional structural and drainage concerns.
Watch for sagging ceilings, new cracks or unusual structural noises. Never climb onto an icy roof.
Arrange professional snow removal if accumulation threatens structural safety.
2. Protect Water Pipes Before Freezing Temperatures Arrive Frozen pipes can burst and cause extensive interior flooding.
Insulate exposed plumbing in crawl spaces, basements, garages and exterior walls.
Disconnect garden hoses, protect outdoor faucets and locate the home's main water shutoff valve.
Older homes in Seattle, Tacoma, Olympia and Bellingham may contain plumbing routed through poorly insulated spaces.
Residents in Spokane, Pullman, Wenatchee and other eastern Washington communities should prepare for longer periods of below freezing temperatures.
Maintain adequate indoor heating during cold outbreaks, including when traveling.
Open cabinet doors beneath vulnerable sinks during extreme cold to improve warm air circulation.
3. Service Your Furnace or Heat Pump Before December A heating failure during a Washington winter storm can quickly become a household emergency.
Schedule professional inspections of natural gas furnaces, boilers, heat pumps and other heating equipment.
Replace appropriate filters, verify thermostat operation and check heating fuel supplies.
Residents using propane, fireplaces, pellet stoves or wood burning equipment should arrange inspections and maintain adequate fuel supplies.
Rural and mountain households relying on propane should check tank levels and arrange deliveries before major storms make roads difficult to access.
Keep heating exhaust outlets clear of drifting snow.
Never use kitchen ovens or outdoor cooking equipment for indoor heating.
4. Prepare for Power Outages Lasting Several Days Heavy wet snow, freezing rain and strong winds can damage electrical lines and utility infrastructure.
Communities across King, Pierce, Snohomish, Thurston and Whatcom counties may experience outages when winter storms damage power lines.
Western Washington's heavily wooded neighborhoods face additional risks from falling tree limbs during snow and wind events.
Mountain and rural communities can experience longer restoration times when heavy snowfall blocks access roads.
Keep flashlights, batteries, charged power banks and emergency radios accessible.
Households relying on electrically powered medical equipment should establish backup arrangements.
Portable generators must operate outdoors, at least 20 feet from windows, doors and vents, with exhaust directed away from buildings.
Never operate generators inside garages, basements or enclosed porches.
5. Build a Winter Storm Emergency Supply Kit Maintain at least three days of emergency supplies, with additional provisions for households in isolated areas.
Store one gallon of drinking water per person daily, nonperishable food, prescription medications, blankets, first aid equipment and pet supplies.
Washington emergency preparedness officials also encourage households to build larger emergency supplies when possible because major disasters can interrupt services for extended periods.
Residents in mountain communities should consider additional provisions if heavy snowfall temporarily closes access roads.
Homes relying on electrically powered private wells should store extra water because pumps may stop functioning during outages.
Keep a manual can opener, flashlights and charging equipment available.
Households in remote eastern Washington and Cascade communities should prepare for longer travel disruptions when winter storms affect mountain highways.
6. Prevent Ice Dams and Expensive Interior Water Damage Ice dams develop when melting roof snow refreezes near colder roof edges, potentially forcing water beneath roofing materials.
Washington's winter conditions can produce repeated melting and refreezing cycles, especially when temperatures fluctuate around freezing.
Inspect attic insulation, seal accessible air leaks and maintain appropriate ventilation.
Replace deteriorated weatherstripping around windows and exterior doors.
Clean gutters and inspect downspouts before freezing conditions arrive.
Homes experiencing recurring ice dams should receive professional evaluations.
Residents in western Washington should also ensure gutters and drainage systems can handle heavy winter rain.
Avoid attempting dangerous roof repairs during icy weather.
7. Remove Hazardous Tree Limbs Before Snow and Ice Strike Heavy, wet snow and freezing rain can break weakened branches, damaging homes, vehicles and electrical infrastructure.
Inspect trees near roofs, garages, driveways and overhead utility lines.
Arrange professional removal of dead or unstable limbs.
Residents in wooded neighborhoods around Seattle, Bellevue, Redmond, Issaquah and Olympia should pay particular attention to branches overhanging structures.
Western Washington's tall evergreen trees can create additional hazards when heavy snow or strong winds damage branches.
Eastern Washington communities may also face falling limbs during heavy snow and freezing rain.
Never approach fallen electrical wires or attempt to remove branches touching power lines.
8. Prepare Snowblowers, Vehicles and Mountain Travel Plans Washington snowstorms can rapidly bury driveways and create dangerous highway conditions.
Inspect snowblowers, shovels and ice melting supplies before December.
Check equipment condition and store fuel safely.
Keep exterior stairways, emergency exits, heating appliance vents and nearby fire hydrants accessible.
Drivers should carry blankets, winter clothing, phone chargers, flashlights, food, water and other emergency vehicle supplies.
Monitor conditions along Interstate 5, Interstate 90, Interstate 82 and Interstate 84 near the Oregon border, as well as U.S. Highways 2, 12 and 97.
Travelers crossing Snoqualmie Pass, Stevens Pass and White Pass should prepare for sudden closures, heavy snowfall and traction requirements.
Washington State Department of Transportation officials may require approved traction tires or chains on mountain routes during hazardous conditions.
Drivers in Seattle, Tacoma and other Puget Sound communities should be especially cautious on steep hills, bridges and untreated neighborhood streets.
Eastern Washington drivers should prepare for blowing snow, drifting and prolonged icy conditions.
Avoid unnecessary travel during winter storm or blizzard warnings.
9. Test Carbon Monoxide Detectors Before Using Backup Heat Carbon monoxide poisoning becomes a serious winter danger when heating equipment malfunctions or generators are used improperly.
Test smoke and carbon monoxide alarms and replace batteries or devices according to manufacturer instructions.
Heavy snowfall can obstruct vehicle exhaust pipes and heating appliance vents.
Never run a vehicle with its tailpipe blocked by snow.
Keep generator exhaust away from buildings and never use charcoal grills, camping stoves or kitchen ovens for indoor heating.
Residents using fireplaces, wood stoves or other fuel burning heating equipment should ensure chimneys and ventilation systems are properly maintained.
Anyone experiencing symptoms of possible carbon monoxide exposure should move to fresh air immediately and call 911.
10. Establish a Family Winter Emergency Plan Identify where household members can safely shelter if electricity or heating becomes unavailable.
Keep emergency contacts written down and locate warming centers when local officials announce their availability.
Check on older neighbors, residents with disabilities and people living alone.
Monitor National Weather Service forecasts, Washington Emergency Management Division announcements and Washington State Department of Transportation road conditions through its real time travel information resources.
Residents in mountain communities should establish communication plans before heavy snowfall or highway closures restrict travel.
Families should also identify alternate shelter arrangements if prolonged power outages make their homes unsafe.
Why December Preparation Matters for Washington Winter 2026/27 Winter weather risks vary considerably across Washington.
Seattle, Bellevue, Redmond, Kirkland and the greater Puget Sound region can experience heavy wet snow, freezing rain, dangerous hills and widespread commuter disruptions.
Tacoma, Lakewood, Puyallup and Pierce County face additional risks from icy roads, fallen trees and prolonged power outages.
Everett, Marysville, Mount Vernon and northwestern Washington may encounter accumulating snow, freezing temperatures and strong winter winds.
Bellingham, Ferndale and Whatcom County face particular risks from cold northeasterly outflow winds, freezing temperatures and hazardous road conditions.
Olympia, Lacey, Tumwater and southwestern Washington can experience heavy rain transitioning to snow or freezing rain during cold outbreaks.
Vancouver, Camas and communities near the Columbia River Gorge may encounter damaging freezing rain and strong east winds.
Spokane, Spokane Valley, Cheney and eastern Washington face greater potential for prolonged snow cover, dangerous wind chills and icy roads.
Wenatchee, Leavenworth, Ellensburg and central Washington can experience significant snowfall, freezing temperatures and difficult mountain travel.
Yakima, Sunnyside, Richland, Kennewick and Pasco may encounter freezing rain, accumulating snow and hazardous conditions along major transportation corridors.
Pullman, Colfax, Walla Walla and southeastern Washington face additional risks from drifting snow, freezing temperatures and dangerous rural travel.
Cle Elum, Roslyn, Winthrop and Cascade mountain communities may experience heavy snowfall, prolonged freezing temperatures and temporary highway closures.
Washington's dramatic differences in elevation and proximity to the Pacific Ocean can create sharply different winter conditions across relatively short distances. A coastal community may experience cold rain while nearby mountain passes receive heavy snow and dangerous travel conditions.
Western Washington can also experience disruptive snow events even when snowfall totals are relatively modest because steep roads, freezing temperatures and limited neighborhood snow removal can create significant travel hazards.
This preparedness guide does not predict a specific December 2026 blizzard or major snowstorm. Significant winter weather remains a recurring seasonal threat, but residents should rely on updated National Weather Service forecasts for actual storm timing and expected impacts.
Waiting until a winter storm warning is issued can leave households scrambling for heating fuel, emergency supplies, backup power and snow removal equipment.
For Washington residents, completing these 10 preparations before December storms develop could mean the difference between safely weathering severe winter conditions and facing frozen plumbing, heating failures, expensive property damage or dangerous emergency travel.