Will Pipes Freeze in Fremont County, ID? 121 nights a Year
Freeze nights in Fremont County
In a normal year Fremont County, ID gets 121 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 98% of US counties.
Risk level: Severe. The risk season runs September to May, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 231 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 121 nights |
| Insulated pipe in unheated space | 10°F | 66 nights |
| Inside the heated house | 0°F | 32 nights |
Foam-sleeving a bare pipe in unheated space takes it from 121 nights of risk to 66 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.
How cold Fremont County nights get
Average winter (Dec-Feb) low: 9°F; the coldest month, January, averages 8°F overnight. 12 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, April, October, November, December: 66 nights a year, and 32 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 8°F | 10°F | 17°F | 25°F | 34°F | 40°F | 45°F | 43°F | 35°F | 26°F | 17°F | 9°F |
Fremont County next to its neighbours
Teton County, WY, 87 km east, gets 163 nights below 20°F to Fremont County's 121 nights. Madison County, ID, 50 km south, gets 88 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Fremont County, ID | - | 231 nights | 121 nights | 8°F |
| Madison County, ID | 50 km south | 186 nights | 88 nights | 12°F |
| Teton County, ID | 55 km southeast | 208 nights | 106 nights | 9°F |
| Clark County, ID | 70 km west | 189 nights | 102 nights | 12°F |
| Jefferson County, ID | 82 km southwest | 199 nights | 107 nights | 8°F |
| Teton County, WY | 87 km east | 279 nights | 163 nights | 2°F |
| Bonneville County, ID | 92 km south | 196 nights | 91 nights | 14°F |
Fremont County within ID
Fremont County ranks 4 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 6,231 ft, Fremont County sits 1,585 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.
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 Island Park, ID, 24 km away (fair 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.