Will Pipes Freeze in Twin Falls County, ID? 41 nights a Year
Freeze nights in Twin Falls County
In a normal year Twin Falls County, ID gets 41 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 57% of US counties.
Risk level: Severe. The risk season runs October to March, worst in December.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 142 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 41 nights |
| Insulated pipe in unheated space | 10°F | 10 nights |
| Inside the heated house | 0°F | 2 nights |
Foam-sleeving a bare pipe in unheated space takes it from 41 nights of risk to 10 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 10/04, last around 05/09. For 20°F: 11/05 to 03/12.
How cold Twin Falls County nights get
Average winter (Dec-Feb) low: 22°F; the coldest month, December, averages 20°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, November, December: 10 nights a year, and 2 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21°F | 24°F | 30°F | 35°F | 42°F | 50°F | 57°F | 55°F | 47°F | 36°F | 26°F | 20°F |
Twin Falls County next to its neighbours
Jerome County, ID, 50 km northeast, gets 47 nights below 20°F to Twin Falls County's 41 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Twin Falls County, ID | - | 142 nights | 41 nights | 21°F |
| Jerome County, ID | 50 km northeast | 152 nights | 47 nights | 21°F |
| Gooding County, ID | 70 km north | 148 nights | 46 nights | 22°F |
| Lincoln County, ID | 82 km northeast | 181 nights | 77 nights | 15°F |
| Cassia County, ID | 86 km east | 163 nights | 63 nights | 18°F |
| Minidoka County, ID | 101 km northeast | 160 nights | 57 nights | 19°F |
| Owyhee County, ID | 127 km west | 166 nights | 56 nights | 21°F |
Twin Falls County within ID
Twin Falls County ranks 36 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 4,531 ft, Twin Falls County sits 115 ft below 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.
The dates to be done by: when freeze season starts and ends.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Twin Falls Sun Vly Regional Airport, ID, 21 km away (fair match). A normal year, not tonight's forecast: check the forecast low for the night itself. How a county figure is built from stations: how the numbers are made.