Bar Nunn, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bar Nunn, a town in Natrona County, Wyoming.
Overnight
30°F
Partly Cloudy
Partly cloudy, with a low around 30. West wind 3 to 8 mph.
7-day forecast for Bar Nunn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 30°F | Partly Cloudy | 3 to 8 mph W | 0% |
| Wednesday | 54°F | Mostly Cloudy | 6 mph N | 0% |
| Wednesday Night | 29°F | Mostly Cloudy | 2 to 6 mph NNW | 0% |
| Thursday | 55°F | Mostly Sunny | 7 to 15 mph SW | 0% |
| Thursday Night | 31°F | Mostly Cloudy | 8 mph SW | 0% |
| Friday | 53°F | Sunny | 9 mph WSW | 2% |
| Friday Night | 30°F | Mostly Clear | 7 to 14 mph SW | 0% |
| Saturday | 56°F | Sunny | 7 to 14 mph SW | 0% |
| Saturday Night | 33°F | Mostly Clear | 7 to 18 mph SW | 0% |
| Sunday | 62°F | Sunny | 16 to 24 mph SW | 0% |
| Sunday Night | 37°F | Mostly Clear | 16 mph SW | 0% |
| Monday | 62°F | Sunny | 7 to 14 mph SW | 0% |
| Monday Night | 37°F | Partly Cloudy | 7 to 13 mph SSW | 0% |
| Tuesday | 61°F | Mostly Sunny | 7 to 16 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Bar Nunn (42.922, -106.347). Updated through the day.
Growing snapshot for Bar Nunn
Last spring frost
May 10
First fall frost
Sep 29
Growing season
138 days
Hardiness zone
5a
More local growing data for Bar Nunn: nearby ZIP 82644 weather · frost dates · planting calendar · Wyoming frost dates
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Midwest
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Climate data from the nearest NOAA station, Casper Wwtp, Wy (4.3 mi from Bar Nunn). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.