Lake County, Minnesota · Two Harbors
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With 41% of homes built before 1960 and about 120 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Heavy rain days of an inch or more come about 3 times a year here, most often in September. A sump pump that hasn't run since last season is a common weak point.
41% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Lake County, 3.61 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
35% of occupied homes in Lake County heat mainly with wood or propane, above the Minnesota county median of 30%.
With 0 muggy nights a year, mold in Lake County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 10,879 people live in Lake County, 2,109 square miles in northeast Minnesota, in roughly 7,449 homes. The county seat is Two Harbors, and Silver Bay, Finland and Knife River round out the largest towns. The county's median home was built in 1969.
52/100 Water Damage Risk Index: Elevated Lake County ranks 40 of 87 Minnesota counties. See the statewide ranking and method.The three factors where Lake County ranks highest compared with other Minnesota counties.
Lake is on the colder side of Minnesota for pipes. From 2015–2024 it averaged 120 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 196 nights at or below 32°F. That ranks 1st of 87 counties.
The longest cold spell was straight 60 days without the temperature rising above freezing, ending in March 2019. The coldest night reached about -36°F on January 27, 2019. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs October to April, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Sep 30 and the last spring freeze around May 24.
Lake gets fewer downpours than most Minnesota counties, but they still fill basements. The county gets about 30.7 inches of rain and melted snow a year, with 3 days of an inch or more (79th of 87). Those downpours cluster in May, June and September, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.61 inches on June 19, 2024. Multi-day storms matter most for basements; the wettest three days on record here totaled 3.83 inches (through June 19, 2024).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 94 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
Roughly 66% of the county's housing was built before 1980. That puts Lake near the middle of Minnesota's 87 counties.
Before 1960 is when 41% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
34% of homes were vacant at survey time. A leak in an empty rental or seasonal house can run for days before anyone notices, which is why those losses tend to be larger.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 0 times a year here, below the Minnesota county median of 13. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectMain heating fuel in Lake County's occupied homes: 42% utility gas, 17% electric, 29% propane and 6% wood. Wood heat is more common here than in most Minnesota counties. Heating equipment is one of the leading causes of home fires nationally, and the NFPA recommends having chimneys and vents inspected every year.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Lake County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Lake gets more pipe-freeze nights than any of its neighbors. All of its neighbors see more heavy-rain days. St. Louis County has the oldest housing nearby, with 70% of homes built before 1980.
By the numbers
| Factor | Lake | Minnesota median | Rank |
|---|---|---|---|
| Homes built before 1960 | 41% | 34% | 31 of 87 |
| Homes built before 1980 | 66% | 58% | 32 of 87 |
| Homes built 2000 or later | 20% | 21% | 47 of 87 |
| Manufactured or mobile homes | 2.7% | 3.8% | 56 of 87 |
| Vacant homes | 34% | 11% | 6 of 87 |
| Wood or propane heat | 35% | 30% | 30 of 87 |
| Nights at 20°F or colder | 120/yr | 89/yr | 1 of 87 |
| Days with 1 inch+ of rain | 3/yr | 5.3/yr | 79 of 87 |
| Freeze-thaw days | 94/yr | 86/yr | 3 of 87 |
| Muggy nights (65°F+) | 0/yr | 13/yr | 86 of 87 |
Rank 1 is the highest value. Bars run from the lowest to the highest Minnesota county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Lake County: freezing from October to April, heavy rain in May, June and September.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology