Casper, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Casper, a city in Natrona County, Wyoming.
Today
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 45 in the afternoon. Southwest wind 7 to 13 mph.
7-day forecast for Casper
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Sunny | 7 to 13 mph SW | 1% |
| Tonight | 26°F | Mostly Clear | 7 mph WSW | 0% |
| Wednesday | 52°F | Patchy Fog then Partly Sunny | 5 mph NW | 0% |
| Wednesday Night | 27°F | Mostly Cloudy | 1 to 6 mph WNW | 0% |
| Thursday | 56°F | Mostly Sunny | 6 to 12 mph SW | 0% |
| Thursday Night | 30°F | Partly Cloudy | 8 mph SW | 0% |
| Friday | 54°F | Sunny | 6 to 10 mph SW | 0% |
| Friday Night | 30°F | Mostly Clear | 7 to 12 mph SW | 1% |
| Saturday | 56°F | Sunny | 7 to 13 mph SW | 1% |
| Saturday Night | 33°F | Mostly Clear | 7 to 21 mph SW | 0% |
| Sunday | 63°F | Sunny | 17 to 25 mph SW | 0% |
| Sunday Night | 39°F | Mostly Clear | 10 to 17 mph SW | 0% |
| Monday | 63°F | Mostly Sunny | 7 to 10 mph SW | 0% |
| Monday Night | 38°F | Partly Cloudy | 7 to 10 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Casper (42.842, -106.321). Updated through the day.
Growing snapshot for Casper
Last spring frost
May 10
First fall frost
Sep 29
Growing season
138 days
Hardiness zone
5a
More local growing data for Casper: 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 Casper). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.