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
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 47 in the afternoon. East southeast wind 3 to 7 mph.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 3 to 7 mph ESE | 0% |
| Tonight | 28°F | Areas Of Fog | 5 mph SSW | 0% |
| Wednesday | 52°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph W | 0% |
| Wednesday Night | 28°F | Partly Cloudy | 3 mph S | 0% |
| Thursday | 54°F | Mostly Sunny | 0 to 6 mph ESE | 0% |
| Thursday Night | 31°F | Partly Cloudy | 0 to 6 mph WNW | 2% |
| Friday | 54°F | Sunny | 2 to 9 mph S | 2% |
| Friday Night | 30°F | Partly Cloudy | 2 to 7 mph SSE | 5% |
| Saturday | 56°F | Sunny | 2 to 6 mph SE | 1% |
| Saturday Night | 32°F | Mostly Clear | 6 mph SE | 0% |
| Sunday | 60°F | Mostly Sunny | 3 to 12 mph SSE | 0% |
| Sunday Night | 35°F | Partly Cloudy | 3 mph SW | 0% |
| Monday | 59°F | Mostly Sunny | 3 mph SSE | 0% |
| Monday Night | 34°F | Mostly Cloudy | 2 mph S | 0% |
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 Nov 3, 2026.