Byron, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Byron, a town in Big Horn County, Wyoming.
This Afternoon
80°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 74 in the afternoon. Southwest wind 2 to 7 mph. Chance of precipitation is 50%.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 49% |
| Tonight | 52°F | Showers And Thunderstorms | 8 to 13 mph NW | 78% |
| Saturday | 64°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 to 21 mph NW | 70% |
| Saturday Night | 46°F | Showers And Thunderstorms Likely | 9 to 21 mph NW | 69% |
| Sunday | 64°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 8 mph NW | 47% |
| Sunday Night | 45°F | Mostly Cloudy | 0 to 7 mph W | 4% |
| Monday | 71°F | Mostly Sunny | 0 to 5 mph ESE | 0% |
| Monday Night | 47°F | Mostly Clear | 2 mph SE | 1% |
| Tuesday | 77°F | Sunny | 2 mph SSE | 0% |
| Tuesday Night | 49°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 2 mph SSE | 15% |
| Wednesday | 78°F | Sunny | 3 mph SSE | 7% |
| Wednesday Night | 49°F | Mostly Clear | 3 mph SSE | 4% |
| Thursday | 79°F | Sunny | 1 to 5 mph SSE | 3% |
| Thursday Night | 49°F | Partly Cloudy | 5 mph SSE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Byron (44.797, -108.508). Updated through the day.
Growing snapshot for Byron
Last spring frost
May 6
First fall frost
Oct 1
Growing season
148 days
Hardiness zone
5a
More local growing data for Byron: nearby ZIP 82412 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Deaver, Wy (7.3 mi from Byron). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.