West seasonal roof
maintenance checklist

No region has more variation in what a roof must endure. A homeowner in Phoenix deals with UV and thermal cycling that bakes materials year-round. A homeowner in Seattle deals with persistent moisture and moss. Someone in the Sierra Nevada deals with snow loads rivaling the Northeast. And someone in the foothills of Southern California deals with wildfire embers that can ignite a roof from a quarter-mile away. This checklist addresses the West's actual diversity.

Spring (March – May)

Rain season is winding down; fire season is approaching. This is the most important transition window of the year.

• Inspect for damage after the rain season

  The West's winter rain season ends in spring. Do a thorough post-rain inspection — look for any lifted shingles, moved flashings, or signs that water found a new entry point during the heavy rains. The Pacific Northwest, in particular, should check for softened fascia and moss progress.
• Clear all combustible debris from the roof surface

  Leaves, pine needles, bark, and duff that accumulated over winter are fire fuel. In fire-prone areas — California foothills, much of the intermountain West — this is not optional maintenance. A clean, debris-free roof is far more ember-resistant than a cluttered one. Clear thoroughly before fire season arrives.
• Inspect and clear ember entry points

  Embers can enter a home through attic vents, open eave areas, and gaps in roof assemblies. Check that vents have 1/16" metal mesh ember guards in place and in good condition. The fine mesh gets clogged with debris over time — clean it so it doesn't restrict airflow while still blocking embers.
• Mountain areas: post-snow damage assessment

  If you're in a mountain zone with a genuine snow season, spring inspection mirrors the Northeast checklist: look for freeze-thaw damage, ice dam evidence, and any movement in flashings or ridge caps.
• Pacific Northwest: moss and lichen treatment

  Moss that took hold over the wet winter grows aggressively in spring. Apply a zinc- or copper-based treatment now, before summer dries it out and makes treatment less effective. Heavy moss holds moisture against shingles and accelerates decay.

Summer (June – September)

Fire season and peak UV exposure. Monthly debris clearance is the most important habit you can build.

• Clear roof debris monthly throughout fire season

  During active fire season — which runs roughly June through October in most of the West — debris on the roof needs to be cleared monthly, not annually. Pine needles in a valley concentrate heat and catch embers easily. This is a regular maintenance habit, not a once-a-year task.
• Inspect Class A material condition

  Your roof's fire resistance is only as good as its current condition. Look for cracked or missing sections of tile, any exposed underlayment, and gaps at ridge caps or flashings — all of which compromise the Class A assembly rating.
• Check ember guards on all vents — monthly

  Fine mesh ember screens clog quickly with debris in dry summer conditions, which reduces attic ventilation at the peak heat moment. Clear them whenever you clear the roof surface.
• Desert areas: UV and thermal cycling inspection

  Desert sun is relentless — UV index peaks in summer and surfaces reach temperatures that accelerate sealant breakdown faster than any other region. Check all caulk joints around penetrations and flashings. Silicone-based sealants outperform acrylic in desert heat.
• Check attic ventilation mid-summer

  Attic temperatures can reach 160–180°F in the desert Southwest. That heat migrates into the shingles from below, drying out the asphalt binder and shortening shingle life dramatically. If your attic is extremely hot, additional ventilation or radiant barrier insulation will pay for itself in extended shingle life.

"A Western roof isn't just a weather barrier — in fire country, it's a fire barrier. Treat it that way."

Fall (October – November)

The first rains reveal every leak. Get ahead of them with a thorough pre-rain inspection.

• Pre-rain-season inspection

  In California and the Pacific Northwest, the transition from dry season to rain season is when deferred maintenance becomes active leaks. Do a full inspection before the first atmospheric river arrives — check flashings, valleys, sealants, and any areas that showed moisture in previous rain seasons.
• Clear gutters and downspouts completely

  Summer debris — leaves, pine needles, bark — has been accumulating all season. A blocked gutter in the first heavy rain causes overflow that soaks fascia and can back water under the edge course. Clear everything before the first significant rain.
• Inspect after the first major rain

  The first storm of the season acts as a diagnostic. Check the attic after the first real rain event and look for any new moisture, staining, or drips. Catching a new leak in October is far cheaper than finding it in January.
• PNW: Pre-winter moss management

  Moss growth in the Pacific Northwest is aggressive and year-round. Apply a preventive zinc or copper treatment in early fall to inhibit the regrowth cycle through the wet season. Heavy moss mats hold moisture against shingles and can work tabs up over time.

Winter (December – February)

Active rain and snow season. The checks here vary significantly by sub-region.

• Inspect the attic after each major storm

  Whether it's Pacific Northwest rain or Sierra snow, a quick attic check after each significant weather event is the cheapest insurance available. Look for drips, new staining, or daylight. Catching an active leak in week one is far less damaging than catching it in week eight.
• Mountain areas: monitor snow load and ice

  Higher-elevation Western homes — in the Cascades, Sierra Nevada, Rockies — face the same snow load and ice-dam risks as New England. Reference the Northeast checklist for winter specifics. Roof rakes, ice dam monitoring, and attic ventilation management are all equally applicable.
• PNW: manage moss during wet season

  The wet season is when Pacific Northwest moss grows fastest. If you haven't treated, a zinc strip at the ridge will slowly release moss-inhibiting ions as rain washes over it. Full removal attempts are more effective in drier months, but prevention continues year-round.
• Check for wind damage along the coast

  Pacific Coast storms generate high sustained winds and lateral rain that can force water through any imperfect seal. After a significant coastal storm, inspect all wall-to-roof junctions and any penetrations on the windward-facing slopes.