Home maintenance in the Upper Midwest
Updated August 2026
Everything in the Upper Midwest bends around a winter cold enough to drive frost 40 to 60 inches into the ground. That depth is why water mains sit so deep, why footings go below it, and why a garage slab heaves. The house spends five months holding heat without leaking it into the attic, and your job in March is to be ready when all that snow turns back into water beside the foundation.
Covers: Minnesota, Wisconsin, Michigan, Iowa, North Dakota, South Dakota, Northern Illinois.
The climate here
This is a continental climate of real extremes: subzero stretches every winter, frost depths of 40 to 60 inches and more across the northern tier, and humid summers that still call for air conditioning. Snow cover sits for months rather than melting between storms, which is precisely the condition that builds ice dams over a leaky attic. Minnesota, Wisconsin, and Iowa also record the highest indoor radon levels in the country, with much of the region in EPA Zone 1. Glacial soils and a high spring water table push water against basement walls every March, and freeze-thaw works on driveways and mortar joints all season.
What the climate does to your house
| Risk | What it does to your house |
|---|---|
| Deep frost and burst pipes | Frost pushes past four feet, so anything shallow is exposed: a line under an unheated garage, a hose bib left connected, an irrigation manifold nobody blew out. Failures here come from weeks of sustained cold reaching into unheated space, not from one bad night. |
| Ice dams over a warm attic | Months of unbroken snow cover plus attic heat loss is the perfect recipe. Water backs up under the shingles and shows as a February stain on an upstairs ceiling, long after the shingles were the part you could have fixed. |
| Radon at the highest levels in the US | Testing is the only way to know. Readings above the 4 pCi/L action level are common across Minnesota, Wisconsin, and Iowa, and a tight, well-sealed modern house holds the gas in better than a drafty old one does. |
| Spring melt and basement flooding | Frozen ground cannot absorb meltwater, so it runs to the lowest point, which is usually your foundation. A sump pump idle all winter, or a discharge line still plugged with ice, floods a finished basement in one warm afternoon. |
| Freeze-thaw on concrete | Water soaks into concrete, freezes, expands, and spalls the surface. Across 100 or more freeze-thaw cycles a season, driveways flake, steps crack, and mortar joints crumble faster than in any milder climate. |
How the calendar shifts here
Two hard deadlines govern the year, and both land earlier than the national checklist suggests. First: service the furnace in September rather than October, and blow out the irrigation and drain the hose bibs before the first hard freeze, which can arrive in the first week of October up north. Second: test the sump in late February, before the thaw, and confirm the discharge line is clear so the pump is not pushing against an ice plug. Between those, winter work is ice-dam watch and snow management. Push painting, deck sealing, and roof work into the short May-to-September window, since coatings will not cure in the cold. If you want the ice-dam and old-house angle in more depth, the Northeast page goes further on it.
| Task | Interval | Effort |
|---|---|---|
| Service the furnace and change the filter | Yearly | $120–250 pro |
| Blow out irrigation and drain hose bibs | Yearly | $60–150 pro |
| Air-seal the attic and reach R-49 to R-60 | Every few years | $1,500–3,500 pro |
| Clear gutters after leaf drop | Yearly | 2–3 hrs · DIY |
| Task | Interval | Effort |
|---|---|---|
| Watch eaves and upstairs ceilings for ice | Weekly | 5 min · DIY |
| Keep furnace intake and exhaust clear of snow | After each storm | 5 min · DIY |
| Run a short-term radon test | Every 2 years | $15–35 kit |
| Task | Interval | Effort |
|---|---|---|
| Test the sump pump and battery backup | Before the thaw | 15 min · DIY |
| Chip the sump discharge line free of ice | Before the thaw | 15 min · DIY |
| Inspect concrete and mortar for spalling | Yearly | 30 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
When should I test my sump pump in the Upper Midwest?
Late February, before the thaw, then quarterly. Pour five gallons of water into the pit and confirm the float rises, the pump runs, and water actually leaves the discharge outside. Walk out and check that termination too: a line packed with ice or buried under a drift means the pump runs against a closed pipe and burns out. A battery backup costs roughly $200–500 and covers the outage that always seems to arrive with the storm.
Why is radon so high in Minnesota and Wisconsin?
Glacial soils and the underlying geology release a lot of it, and much of the region sits in EPA Zone 1 where the predicted indoor average exceeds 4 pCi/L. Tight modern construction then traps what enters. Testing is cheap at $15–35 for a short-term kit and belongs in winter with the windows closed. Mitigation, a sub-slab pipe and fan, typically runs $800–1,500 here and drops most homes well below the action level.
How much attic insulation stops ice dams here?
R-49 to R-60 is the target for this climate zone, but depth alone will not do it. Air sealing comes first: the attic hatch, wire and pipe penetrations, bath fan housings, and wall top plates, because warm moist air rising through those gaps is what melts the snow. Then confirm the soffit vents are not stuffed with insulation and air can travel to the ridge. Insulation without a cold, vented attic simply relocates the problem.
Do I need to keep furnace vents clear of snow?
Yes, and treat it as a safety item rather than a comfort one. High-efficiency furnaces and many water heaters vent through PVC pipes low on an exterior wall, where drifting snow or ice off a dripping roof edge can seal them. A blocked exhaust shuts the appliance down at best and spills combustion gas at worst. Check after every heavy snow, keep a two-foot clear radius, and confirm the CO alarm on that level works.