Homeowner reference
Home maintenance calendar: Oregon & Idaho.
Two climates, one calendar. The Portland Metro is mild and wet, with its heaviest rain in late fall and winter. The Treasure Valley is high desert: hot, dry summers, cold snowy winters, and an irrigation system that needs to be winterized every year. The same month calls for different work in the two regions, so this guide keeps them in separate columns. It is an evergreen reference, written for typical conditions, not your specific home.
March, April, May
Spring
Both states share the basics; the columns below cover what genuinely differs.
Do this in both states
- Test smoke and carbon monoxide detectors and replace batteries.
- Have the HVAC system (furnace and heat pump) serviced before the seasons flip.
- Clean the dryer vent and check the exhaust flap opens and closes.
- Inspect the roof for damage the winter left behind, and repair loose or missing shingles.
- Check exterior caulking and seals around windows, doors, and siding.
Portland Metro · Oregon
Mild, wet, and green
- Clear gutters and downspouts after the rainiest months, and confirm water drains well away from the foundation.
- Look for moss on the roof and on north-facing siding; treat or gently remove it before it spreads.
- Inspect the crawl space and basement for moisture after months of rain, and fix any damp spots while they are small.
- Test the sump pump if you have one, and clear window wells of leaves and pooling water.
- Trim vegetation away from the house so plants do not wick moisture onto siding or the crawl space.
Treasure Valley · Idaho
High desert, hot and cold
- Have the irrigation system inspected, then turn it on only after the last frost; walk every zone and repair leaks or broken heads.
- Pull the cover off the AC condenser, clean the fins, and have the cooling system serviced before June heat arrives.
- Check the roof and gutters for damage packed down by winter snow and ice.
- Seal any gaps or chewed entry points, a sign field mice moved in over the winter.
- Clean or replace the furnace filter and vacuum registers after a winter of firing.
June, July, August
Summer
Both states share the basics; the columns below cover what genuinely differs.
Do this in both states
- Clean or replace HVAC filters, and keep the condenser fins and coils clear of debris.
- Check window screens and repair tears before mosquitoes and wasps find them.
- Test the water heater for leaks, and flush it if you can do so safely per the manual.
- Walk the exterior and tighten loose railings, gates, and hardware.
Portland Metro · Oregon
Mild, wet, and green
- Wildfire smoke prep: swap in clean air filters and consider a portable air purifier for smoke-season weeks.
- Put garden and lawn irrigation on a timer and adjust for early-summer rain.
- Check attic, eave, and soffit vents for bird or wasp nests before they grow.
- Seal and re-stain wood decks and fences while it is dry.
- Keep gutters clear even in the dry months so the first big fall rain drains properly.
Treasure Valley · Idaho
High desert, hot and cold
- Wildfire season prep: clear dry grass, weeds, and dead brush within about 30 feet of the house.
- Trim low branches and rake pine needles and leaves off the roof and out of gutters.
- Keep a hose ready at an exterior tap, and check drip lines and soaker hoses for leaks.
- Run the AC wisely in 90-degree-plus heat: clean the condenser fins and change filters monthly.
- Water the lawn deeply and early in the morning to carry it through the hottest weeks, and watch sprinkler coverage so no zone starves.
September, October, November
Fall
Both states share the basics; the columns below cover what genuinely differs.
Do this in both states
- Service the furnace or heat pump before it carries the season, and change the filter.
- Check weatherstripping and door sweeps so cold air finds no cracks.
- Test the water shutoff valve and label it for the family.
- Trim trees and branches that could reach the roof or power lines in a storm.
Portland Metro · Oregon
Mild, wet, and green
- Do a thorough gutter and downspout clean before October rains, and confirm downspout extensions move water away from the foundation.
- Inspect the roof for loose or damaged shingles with the wettest months ahead.
- Rake leaves off the lawn and out of planters, and clear walkway drains.
- Shut off and drain exterior hose bibs before the first hard freeze.
- Clean and store summer tools, and bring hoses in so they last.
Treasure Valley · Idaho
High desert, hot and cold
- Winterize the irrigation system: have sprinkler lines blown out before the first hard freeze.
- Shut off, drain, and insulate exterior faucets, and cover them to keep ice out.
- Seal gaps around pipes, vents, and the garage where field mice look for winter shelter.
- Stock ice melt, check the snow blower, and test the generator if you rely on one.
- Add weatherstripping and check the attic insulation before cold, dry nights arrive.
December, January, February
Winter
Both states share the basics; the columns below cover what genuinely differs.
Do this in both states
- Change furnace filters monthly and keep registers and vents clear.
- Test smoke and carbon monoxide detectors monthly; windows stay closed for months.
- Check exposed pipes for drafts and wrap the most vulnerable ones.
- Keep an emergency kit handy: flashlights, batteries, ice melt, and a basic tool kit.
Portland Metro · Oregon
Mild, wet, and green
- Expect ice storms more than heavy snow: keep sand or ice melt near the door and a windshield scraper in the car.
- Know where the main water shutoff is in case a pipe freezes.
- Keep gutters clear of heavy, wet debris so rain and melt drain freely.
- Let faucets drip during hard cold snaps, especially on exterior walls.
- Check the crawl space for moisture and confirm vents stay open for airflow.
Treasure Valley · Idaho
High desert, hot and cold
- Clear snow off entry paths and from around the dryer, furnace, and water heater vents so nothing backs up.
- Watch for ice dams forming at the roofline, and clear snow from the roof edge when it is safe to do so.
- Keep heat tape or insulated covers on exposed pipes, and let faucets drip in extreme cold.
- Run a humidifier if indoor air gets very dry; check the furnace humidifier if it has one.
- Set the thermostat to a steady temperature, and open under-sink cabinet doors during deep freezes.
General suggestions, not specifications.
This calendar describes typical maintenance for typical homes in each region. Seasons, freeze dates, smoke seasons, and your home's age and construction all change what you actually need. Confirm specifics with a licensed contractor, your HVAC technician, and your irrigation professional, and follow the manuals that came with your appliances. Your county or city may also have its own rules, especially around burn seasons and water use.
Maintenance question, or ready for the next home?
Paul can point you to trusted local contractors in Oregon and Idaho, or help you find a home that needs less upkeep. Call 503-475-6136 to talk it through.