Winter Roof Maintenance in Portland: Rain, Wind, Ice, and Snow

By Brendan Jobin, Jobin Roofing · Licensed OR CCB #221810 & WA #JOBINRL824MZ · Malarkey Emerald Premium Contractor · Serving Clark County, WA & the Portland metro · Updated September 2026

• Dec to Feb: about 14.5 in of rain at PDX
• Normal snow: about 4 in a year
• Biggest risk: ice storms & wind
• Never: chip ice off a roof

Portland winters bring a mix of steady rain, wind, cold snaps, and the occasional snow. Each one stresses a roof in a different way, and they often arrive together. If you prepared in the fall, winter is about keeping that work holding up. If you did not, it is not too late to catch problems before they get worse.

What a Portland winter looks like

Here is a normal winter at Portland International Airport, from the National Weather Service’s 1991 to 2020 climate normals.

Source: National Weather Service Portland, 1991 to 2020 normals at PDX.

Those averages hide the big years. PDX recorded 19 inches of snow in December 2008, and the same NWS records show the West Hills get around 60 inches of rain a year compared to about 37 at the airport. Homes near the Gorge, like those in Troutdale, and higher, more exposed areas like Battle Ground see more wind, ice, and snow than the city average.

The January 2024 ice storm: what it taught us

In mid-January 2024, an arctic blast met a Pacific storm. Winds in the Columbia River Gorge reached 80 mph, gusts in Portland topped 50 mph, and about a quarter inch of ice coated the Portland area. At one point more than 200,000 locations across Oregon were without power, and Governor Kotek declared a statewide emergency.

For roofs, the damage came from three directions: falling trees and limbs weighed down with ice, gutters pulled off by the weight of ice, and wind lifting shingles that had lost their seal. None of that is preventable once the storm hits. All of it is easier to survive on a roof that went into winter in good shape.

Winter roof threats in the Pacific Northwest

1. Ice storms and freezing rain

Freezing rain coats everything, and ice is heavy. It can pull gutters off the fascia, bring down branches, and make roofs dangerous to walk on for days. Never try to chip or scrape ice off a roof. You will damage the shingles and risk a serious fall. Let it melt, and have the roof checked once it does.

2. Ice dams during cold snaps

Ice dams are rare here but they do happen during extended cold spells with snow on the roof. Heat escaping from the house melts snow on the upper roof, the water runs down and refreezes at the colder eaves, and the ice backs water up under the shingles. The fix is good attic insulation and ventilation, plus ice and water barrier at the eaves when the roof is installed.

3. Attic condensation

This is the winter problem most homeowners never see. With the house closed up for months, moisture from showers, cooking, and laundry rises into the attic and condenses on the cold underside of the roof deck. Signs include frost on nail tips, damp or dark sheathing, and a musty smell. Left alone, it rots the roof from the inside even when the shingles are fine.

4. Wind damage

The Malarkey shingles we install carry a 110 mph standard wind warranty, and our winter storms usually gust well below that. When shingles blow off in a Portland winter, it is usually because they are old, never sealed, or were nailed wrong. Missing shingles leave the underlayment exposed, and it breaks down quickly in the rain, so get them replaced right away.

5. Steady rain finding small gaps

Weeks of rain turn small weaknesses at flashing, skylights, chimneys, and pipe boots into leaks. Our guide to atmospheric river roof damage covers why long soaking storms are so hard on roofs.

Winter roof maintenance checklist

1. Keep gutters and downspouts clearLeaves and needles keep falling into December. Check after big storms, and watch for gutters sagging or pulling away, especially after ice.
2. Look at the roof after every major stormFrom the ground, check for missing shingles, lifted ridge caps, and granules or debris in the yard.
3. Check the attic once a monthUse a flashlight. Look for frost on nails, damp sheathing, stains, or daylight.
4. Watch the ceilingsBrown or yellow spots near skylights, chimneys, and exterior walls are early leak signs.
5. Keep an eye on overhanging treesIce and soaked ground make limbs and whole trees more likely to come down.
6. Stay off an icy or wet roofAnything that needs hands-on work in winter is a job for a roofer.

If you are reading this before the rain starts, our fall roof maintenance checklist covers the prep that makes winter easier: gutters, moss, branches, and flashing.

What about moss in winter?

Moss grows fastest in our wet months, swelling and lifting shingle edges. Winter is not the best time for full treatment, but you can keep it from spreading. Never pressure wash an asphalt roof. It strips the protective granules and can take years off the roof’s life. Late summer and early fall are the best time for treatment. See our roof maintenance and cleaning page for how we handle it.

If you find a leak this winter

Protect what is inside, take photos, and stay off the roof. Here is what to do if you find an active leak. If wind or a fallen tree caused the damage, our storm damage roof repair guide covers the first 48 hours and insurance documentation, and our emergency roof repair team can tarp an open roof to stop the water.

Older roofs are the most vulnerable in winter. If yours is past 15 to 20 years and showing curling, bald patches, or repeated leaks, a repair may only buy a season. We will tell you honestly which one you need.

Sources: National Weather Service Portland, Climate of Portland and precipitation and snowfall normals (1991 to 2020); OPB and Oregon Capital Chronicle coverage of the January 2024 ice storm; Malarkey Vista AR specifications.