Winter Storms risk in Washington

Winter storms in Washington: what to expect

Washington’s winter storms vary widely by region. The Cascade Range and Olympic Mountains receive some of the heaviest snowfall in the contiguous United States, while eastern Washington often sees cold, dry snow and prolonged freezing temperatures. The Puget Sound lowlands occasionally get significant snow or ice, and the Columbia River Gorge is known for freezing rain and ice storms. Winter storm season typically runs from November through March, though mountain snow can fall earlier and later.

The most exposed areas include mountain passes such as Snoqualmie, Stevens, and White Pass, where heavy snow and avalanches can close highways. Eastern Washington cities like Spokane, Wenatchee, and Yakima face snow and cold waves. The Columbia River Gorge can experience damaging ice accumulations. Even the Puget Sound region, which is usually mild, can be hit by rare but impactful snow and ice events. According to the Washington Emergency Management Division, winter storms are a recurring hazard that can disrupt transportation, utilities, and daily life.

Winter storms in Washington often involve atmospheric rivers that bring heavy rain to the coast and lowlands and heavy snow to the mountains. These events can cause flooding, landslides, and avalanches. Wind storms can accompany winter systems, leading to downed trees and power lines. The National Weather Service emphasizes that winter weather can change rapidly, especially in mountainous terrain, and advises checking forecasts before travel.

How it affects homes

Winter storms can damage homes in several ways. Heavy snow and ice can stress roofs, leading to leaks or structural failure, especially on flat or low-slope roofs and older structures. Ice dams—formed when snow melts and refreezes at the roof edge—can force water into attics and walls. Freezing temperatures can burst water pipes, causing significant water damage. Falling trees and branches, weighed down by snow or ice, can crush roofs, windows, and vehicles. Power outages can leave homes without heat, increasing the risk of frozen pipes and carbon monoxide poisoning from improper use of generators or space heaters.

Insurance considerations: Most standard homeowners insurance policies cover damage from fallen trees, weight of ice and snow, and burst pipes (if the homeowner took reasonable steps to prevent freezing). However, flood damage—including from snowmelt or heavy rain—is generally not covered by standard policies and requires separate flood insurance, such as through the National Flood Insurance Program (NFIP). It’s wise to review your policy before winter, document your home’s condition, and understand your deductible for winter-related claims. The Washington Emergency Management Division and Ready.gov recommend keeping a home inventory and knowing how to file a claim.

How to prepare your home

Prepare for winter storms before they arrive. Use this checklist:

• Insulate exposed water pipes in attics, crawl spaces, and garages. Let faucets drip during extreme cold and open cabinet doors to allow warm air to circulate.
• Seal gaps around windows, doors, and foundations with weatherstripping or caulk. Install storm windows or plastic film to reduce heat loss.
• Have your heating system serviced annually. Ensure you have a safe, working backup heat source, such as a fireplace or approved space heater.
• Clean gutters and downspouts to prevent ice dams. Consider installing roof rakes or heat cables in areas prone to ice dams.
• Trim tree branches that could fall on your home or power lines. Remove dead trees.
• Reinforce your roof if it is older or has a low slope; check with a contractor about local snow load requirements.
• Keep an emergency supply kit with food, water, medications, flashlights, batteries, and a battery-powered radio. Include a first-aid kit and a manual can opener.
• Install carbon monoxide detectors on every level of your home. Never use a generator, camp stove, or charcoal grill indoors.
• If you use a generator, place it outdoors, away from windows and doors, and follow the manufacturer’s instructions.
• Have a communication plan with family members. Keep phones charged and consider a backup battery pack.
• Clear snow from driveways and walkways safely—avoid overexertion, which can lead to heart attacks.
• Check on neighbors, especially the elderly and those with medical needs.

The CDC provides additional guidance on preventing cold-related health problems and staying safe during power outages.

Frequently asked questions

What parts of Washington are most at risk from winter storms?

The Cascade Mountains and Olympic Mountains receive the most snow and are prone to avalanches. Eastern Washington faces cold temperatures and snow, while the Columbia River Gorge is known for ice storms. The Puget Sound lowlands can get occasional snow and ice, but the risk is lower than in mountain and eastern areas. However, even a small amount of snow or ice can disrupt the region because it is not as well-equipped as colder states.

How can I prevent frozen pipes during a Washington winter storm?

Insulate pipes in unheated areas, seal drafts, and keep cabinet doors open under sinks to let warm air circulate. During extreme cold, let faucets drip slightly and keep your home heated to at least 55°F (12°C). If you leave for vacation, shut off the water and drain the system, or have someone check on your home. The Ready.gov winter weather page recommends these steps to prevent costly water damage.

Does homeowners insurance cover winter storm damage in Washington?

Most standard homeowners policies cover damage from fallen trees, ice dams, and burst pipes if you took reasonable care to prevent freezing. However, flood damage from snowmelt or heavy rain is not covered by standard policies—you would need a separate flood insurance policy. Review your policy and talk to your insurance agent to understand your coverage before winter arrives.

Official resources

• Washington Emergency Management Division
• National Weather Service – Winter Weather Safety
• Ready.gov – Winter Weather
• CDC – Winter Weather