Will Pipes Freeze in Musselshell County, MT? 76 nights a Year
Freeze nights in Musselshell County
In a normal year Musselshell County, MT gets 76 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 80% 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 | 169 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 76 nights |
| Insulated pipe in unheated space | 10°F | 39 nights |
| Inside the heated house | 0°F | 18 nights |
Foam-sleeving a bare pipe in unheated space takes it from 76 nights of risk to 39 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 09/21, last around 05/20. For 20°F: 10/23 to 04/11.
How cold Musselshell County nights get
Average winter (Dec-Feb) low: 14°F; the coldest month, January, averages 13°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: 39 nights a year, and 18 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 13°F | 15°F | 22°F | 30°F | 39°F | 48°F | 53°F | 51°F | 42°F | 32°F | 22°F | 14°F |
Musselshell County next to its neighbours
Golden Valley County, MT, 58 km west, gets 87 nights below 20°F to Musselshell County's 76 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Musselshell County, MT | - | 169 nights | 76 nights | 13°F |
| Golden Valley County, MT | 58 km west | 181 nights | 87 nights | 14°F |
| Yellowstone County, MT | 64 km south | 181 nights | 89 nights | 12°F |
| Petroleum County, MT | 73 km north | 176 nights | 89 nights | 11°F |
| Treasure County, MT | 95 km east | 173 nights | 85 nights | 10°F |
| Fergus County, MT | 100 km northwest | 184 nights | 88 nights | 14°F |
| Wheatland County, MT | 109 km west | 191 nights | 90 nights | 13°F |
Musselshell County within MT
Musselshell County ranks 49 of 56 MT counties for nights below 20°F. The most is Sheridan County, MT at 129 nights, with a 2°F average winter low. The fewest is Lake County, MT: 40 nights, winter lows near 22°F. At 3,326 ft, Musselshell County sits 596 ft below the state's median county elevation of 3,922 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 Roundup, MT, 10 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. What a "fair" or "distant" station match means is in the method guide.