Byron, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Byron, a city in Olmsted County, Minnesota.
Tonight
50°F
Rain Showers
Rain showers. Cloudy. Low around 50, with temperatures rising to around 53 overnight. North wind around 8 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Rain Showers | 8 mph N | 96% |
| Wednesday | 53°F | Rain Showers | 7 to 14 mph SW | 94% |
| Wednesday Night | 44°F | Rain Showers | 14 mph W | 91% |
| Thursday | 49°F | Rain Showers Likely | 15 mph N | 71% |
| Thursday Night | 36°F | Mostly Cloudy | 8 to 12 mph N | 10% |
| Friday | 46°F | Partly Sunny | 5 to 8 mph N | 0% |
| Friday Night | 30°F | Partly Cloudy | 3 mph NW | 0% |
| Saturday | 52°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 8 mph W | 9% |
| Sunday | 56°F | Mostly Sunny | 9 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 9 mph SW | 2% |
| Monday | 59°F | Mostly Sunny | 9 to 14 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 9 mph W | 1% |
| Tuesday | 56°F | Mostly Sunny | 8 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov) for Byron (44.038, -92.641). Updated through the day.
Growing snapshot for Byron
Last spring frost
May 12
First fall frost
Sep 28
Growing season
139 days
Hardiness zone
4b
More local growing data for Byron: nearby ZIP 55920 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Byron 4North, Mn (5.5 mi from Byron). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.