Bar Nunn, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bar Nunn, a town in Natrona County, Wyoming.
Today
74°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 2pm and 3pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 74. West southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast for Bar Nunn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph WSW | 30% |
| Tonight | 43°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph NW | 68% |
| Sunday | 63°F | Showers And Thunderstorms Likely | 9 to 13 mph W | 64% |
| Sunday Night | 39°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 8 mph WNW | 12% |
| Monday | 69°F | Sunny | 3 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 3 to 12 mph SE | 0% |
| Tuesday | 75°F | Sunny | 3 to 7 mph SSW | 0% |
| Tuesday Night | 46°F | Slight Chance Showers And Thunderstorms | 8 mph SSE | 16% |
| Wednesday | 77°F | Mostly Sunny | 9 to 14 mph SW | 7% |
| Wednesday Night | 45°F | Partly Cloudy | 7 mph SW | 6% |
| Thursday | 80°F | Sunny | 9 mph SW | 0% |
| Thursday Night | 47°F | Mostly Clear | 6 mph SSE | 1% |
| Friday | 81°F | Mostly Sunny | 6 to 13 mph SW | 4% |
| Friday Night | 49°F | Partly Cloudy | 9 mph SSW | 7% |
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 Sep 19, 2026.