Will Pipes Freeze in Cassia County, ID? 63 nights a Year
Freeze nights in Cassia County
In a normal year Cassia County, ID gets 63 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 73% of US counties.
Risk level: Severe. The risk season runs October to April, worst in December.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 163 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 63 nights |
| Insulated pipe in unheated space | 10°F | 20 nights |
| Inside the heated house | 0°F | 4 nights |
Foam-sleeving a bare pipe in unheated space takes it from 63 nights of risk to 20 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 10/02, last around 05/21. For 20°F: 11/03 to 03/31.
How cold Cassia County nights get
Average winter (Dec-Feb) low: 19°F; the coldest month, January, averages 18°F overnight. 10 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Jun, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, November, December: 20 nights a year, and 4 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 18°F | 21°F | 27°F | 32°F | 40°F | 47°F | 55°F | 54°F | 45°F | 34°F | 25°F | 18°F |
Cassia County next to its neighbours
Box Elder County, UT, 87 km southeast, gets 73 nights below 20°F to Cassia County's 63 nights. Minidoka County, ID, 64 km north, gets 57 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Cassia County, ID | - | 163 nights | 63 nights | 18°F |
| Minidoka County, ID | 64 km north | 160 nights | 57 nights | 19°F |
| Jerome County, ID | 69 km northwest | 152 nights | 47 nights | 21°F |
| Power County, ID | 79 km northeast | 151 nights | 56 nights | 18°F |
| Twin Falls County, ID | 86 km west | 142 nights | 41 nights | 21°F |
| Box Elder County, UT | 87 km southeast | 168 nights | 73 nights | 15°F |
| Lincoln County, ID | 90 km northwest | 181 nights | 77 nights | 15°F |
Cassia County within ID
Cassia County ranks 24 of 44 ID counties for nights below 20°F. The most is Custer County, ID at 145 nights, with a 5°F average winter low. The fewest is Nez Perce County, ID: 20 nights, winter lows near 27°F. At 6,301 ft, Cassia County sits 1,654 ft above the state's median county elevation of 4,646 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 Rosette, UT, 55 km away (distant 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.