Home maintenance in the Mountain West
Updated August 2026
At altitude the house is fighting hard freezes, snow load, and UV strong enough to gray a deck in two summers. Thin dry air ties all three together: it lets the temperature fall 40°F after sunset, it pulls moisture out of wood and caulk, and it does nothing to soften the sunlight. Add radon from Rocky Mountain geology and, along the Front Range, a real wildfire exposure, and you get a list borrowing from three other regions at once.
Covers: Colorado, Utah, Idaho, Montana, Wyoming, Northern New Mexico, Northern Arizona.
The climate here
Elevation drives everything. At 5,000 to 8,000 feet the air holds little moisture, so a 75°F afternoon can be followed by a 35°F night, and that daily 40-degree swing works joints, sealants, and fasteners loose over the years. Ultraviolet intensity climbs roughly 4% for every 1,000 feet of elevation, which is why decks, south-facing paint, and window seals fail well ahead of the manufacturer estimate. Winters deliver serious snow, and roofs are engineered to a ground snow load that varies town by town. Colorado and much of the Rockies fall in EPA radon Zone 1, and parts of the Front Range sit on bentonite clay that swells dramatically when it gets wet.
What the climate does to your house
| Risk | What it does to your house |
|---|---|
| Hard freezes and burst pipes | Nights below 10°F are routine from November into March. Hose bibs, garage plumbing, and lines in vented crawl spaces freeze first, and a second home left at 50°F through a power outage is the classic total loss. |
| Snow load and ice dams | Deep, dense snow sits on roofs for weeks. Where the attic leaks heat, meltwater refreezes at the eave and dams; where a valley collects drift or a section is low-slope, the sheer weight becomes the problem instead. |
| UV and bone-dry air | Strong sunlight plus single-digit humidity checks and grays exterior wood quickly. Decks want resealing every 1 to 2 years rather than every 3 to 5, and caulk lines shrink and split, opening the gaps that let wind-driven snow into wall assemblies. |
| Radon from mountain geology | Uranium-bearing rock and soil make this one of the highest-radon parts of the country. Basements and garden-level rooms concentrate it, and readings several times the 4 pCi/L action level are common along the Front Range. |
| Wildfire in the foothills | Foothill neighborhoods sit squarely in the wildland-urban interface, and the Marshall Fire showed that suburban grass fire can move faster than a forest fire. Embers rather than flame fronts ignite most of the houses that burn. |
| Expansive bentonite clay | Bentonite swells substantially as it takes on water, lifting slabs and basement floors and cracking foundation walls. Downspout extensions and grading are structural items here, not landscaping details. |
How the calendar shifts here
The exterior work window is short, so sequence matters more than usual. Do paint, deck sealing, and roof repairs between June and September, while nights stay above 40°F and coatings will cure. Finish the freeze list by early October: heating service, hose bibs drained and covered, irrigation blown out, and the evaporative cooler drained and capped if you run one. Wildfire work belongs in early summer, once the grass is cut and you can see what is growing against the house. Winter is snow management, so keep vents clear, watch the eaves after each melt, and rake low-slope sections. Test for radon during the closed-up months. On the arid southern edge of the region, the desert Southwest list covers the hard-water and sun items in more depth.
| Task | Interval | Effort |
|---|---|---|
| Reseal decks and exposed exterior wood | Every 1–2 years | A weekend · DIY or $500–1,500 pro |
| Re-caulk trim, windows, and siding joints | Yearly | 2–3 hrs · DIY |
| Cut defensible space out to 100 ft | Yearly | A weekend · DIY or $400–1,500 pro |
| Task | Interval | Effort |
|---|---|---|
| Heating service and filter change | Yearly | $130–280 pro |
| Blow out irrigation and cap hose bibs | Yearly | $60–150 pro |
| Drain and cover the evaporative cooler | Yearly | 1 hr · DIY |
| Task | Interval | Effort |
|---|---|---|
| Rake snow off low-slope roofs and valleys | After heavy snow | 1 hr · DIY |
| Keep furnace and dryer vents clear of drift | After each storm | 5 min · DIY |
| Run a short-term radon test | Every 2 years | $15–35 kit |
| Confirm downspouts carry melt 6 ft out | Monthly | 10 min · DIY |
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
How often should I re-stain a deck at altitude?
Every one to two years on sun-exposed surfaces, roughly half the interval a sea-level deck needs. UV at 6,000 feet plus humidity in the teens dries and checks the grain fast, and once the grain opens, snowmelt gets in and the freeze cycle splits the board. Wash it, let it dry two days in that dry air, then recoat. Semi-transparent stain costs $40–70 a gallon and covers about 200 to 300 square feet.
Does a radon mitigation system need maintenance?
Yes, and the fan is the part everyone forgets. A sub-slab depressurization system runs continuously, and its fan typically lasts 5 to 10 years before it fails silently. Check the manometer, the small U-tube gauge on the pipe, once a month: if the two liquid columns sit level, the fan has stopped and the house is no longer protected. A replacement fan runs about $300–600 installed. Retest the house every two years either way.
How do I protect a mountain house I only visit occasionally?
Never switch the heat off. Hold the thermostat at 55°F or higher, open cabinet doors under sinks on exterior walls, and fit a cellular temperature and leak sensor that texts you below 45°F; those run roughly $50–200. If the place will sit empty for months, the safer route is shutting the main, draining the lines, and putting antifreeze in the traps. A burst line at 8,000 feet can run for weeks before a neighbor notices.
My basement floor cracked and lifted. Is that bentonite clay?
Possibly. Bentonite swells as it wets, and the classic pattern is a slab or garage floor that heaves and cracks along a line, plus doors that suddenly bind, usually after a wet spring or a leaking downspout. Before anyone mentions piers, fix the water: extend downspouts at least six feet, regrade so soil falls away from the foundation, and stop irrigating within five feet of it. If movement continues through a dry year, a structural engineer at roughly $500–1,000 beats a free contractor estimate.