Will Pipes Freeze in Cass County, MN? 111 nights a Year
Freeze nights in Cass County
In a normal year Cass County, MN gets 111 nights at or below 20°F, the point where bare pipes in a garage, attic or outside wall start to freeze. That is more than 95% of US counties.
Risk level: Severe. The risk season runs October to April, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 179 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 111 nights |
| Insulated pipe in unheated space | 10°F | 73 nights |
| Inside the heated house | 0°F | 46 nights |
Foam-sleeving a bare pipe in unheated space takes it from 111 nights of risk to 73 nights. A 12 ft heat-tape kit runs $17 to $37; an average burst-pipe repair is about $500.
Month by month
Nights at or below 20°F in a normal year.
First 32°F night is usually around 10/05, last around 05/05. For 20°F: 11/06 to 04/08.
How cold Cass County nights get
Average winter (Dec-Feb) low: 5°F; the coldest month, January, averages 0°F overnight. 9 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, April, November, December: 73 nights a year, and 46 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0°F | 4°F | 18°F | 31°F | 44°F | 54°F | 59°F | 57°F | 48°F | 36°F | 23°F | 10°F |
Cass County next to its neighbours
Hubbard County, MN, 47 km west, gets 116 nights below 20°F to Cass County's 111 nights. Crow Wing County, MN, 55 km south, gets 107 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Cass County, MN | - | 179 nights | 111 nights | 0°F |
| Hubbard County, MN | 47 km west | 185 nights | 116 nights | -2°F |
| Crow Wing County, MN | 55 km south | 176 nights | 107 nights | 0°F |
| Wadena County, MN | 64 km southwest | 184 nights | 115 nights | -2°F |
| Aitkin County, MN | 80 km southeast | 183 nights | 111 nights | -1°F |
| Itasca County, MN | 81 km northeast | 190 nights | 117 nights | -4°F |
| Morrison County, MN | 104 km south | 168 nights | 102 nights | 3°F |
Cass County within MN
Cass County ranks 21 of 87 MN counties for nights below 20°F. The most is St. Louis County, MN at 130 nights, with a 0°F average winter low. The fewest is Winona County, MN: 81 nights, winter lows near 12°F. At 1,345 ft, Cass County sits 231 ft above the state's median county elevation of 1,114 ft.
What to do here
- Treat it as a building fix, not a night-of routine: insulate, heat tape, seal crawlspace vents.
- An automatic leak shutoff pays for itself if one burst is avoided.
- Know where the main shutoff is before the first hard freeze.
At this many nights, foam alone is not the answer: insulate or heat tape?.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Deep Portage, MN, 7 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. Why elevation is part of the blend: how county numbers are made.