Will Pipes Freeze in Fremont County, WY? 105 nights a Year
Freeze nights in Fremont County
In a normal year Fremont County, WY gets 105 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 94% 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 | 184 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 105 nights |
| Insulated pipe in unheated space | 10°F | 53 nights |
| Inside the heated house | 0°F | 21 nights |
Foam-sleeving a bare pipe in unheated space takes it from 105 nights of risk to 53 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 09/28, last around 05/16. For 20°F: 10/25 to 04/08.
How cold Fremont County nights get
Average winter (Dec-Feb) low: 9°F; the coldest month, January, averages 8°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, October, November, December: 53 nights a year, and 21 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 8°F | 12°F | 23°F | 30°F | 40°F | 48°F | 55°F | 53°F | 44°F | 31°F | 19°F | 8°F |
Fremont County next to its neighbours
Sublette County, WY, 111 km west, gets 165 nights below 20°F to Fremont County's 105 nights. Natrona County, WY, 150 km east, gets 104 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Fremont County, WY | - | 184 nights | 105 nights | 8°F |
| Hot Springs County, WY | 75 km north | 186 nights | 105 nights | 9°F |
| Sublette County, WY | 111 km west | 264 nights | 165 nights | 0°F |
| Washakie County, WY | 119 km northeast | 189 nights | 107 nights | 5°F |
| Natrona County, WY | 150 km east | 195 nights | 104 nights | 11°F |
| Sweetwater County, WY | 157 km south | 192 nights | 95 nights | 13°F |
| Big Horn County, WY | 171 km north | 183 nights | 109 nights | 5°F |
Fremont County within WY
Fremont County ranks 9 of 23 WY counties for nights below 20°F. The most is Sublette County, WY at 165 nights, with a 1°F average winter low. The fewest is Platte County, WY: 69 nights, winter lows near 16°F. At 5,367 ft, Fremont County sits 71 ft above the state's median county elevation of 5,297 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.
Interior pipes have a threshold too: the four freeze points.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Riverton, WY, 11 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.