Heron Lake, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Heron Lake, a city in Jackson County, Minnesota.
Overnight
59°F
Widespread Fog
Widespread fog and patchy drizzle. Cloudy, with a low around 59. Northeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Heron Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Widespread Fog | 5 mph NE | 17% |
| Saturday | 65°F | Widespread Fog | 5 to 10 mph N | 23% |
| Saturday Night | 53°F | Patchy Fog | 10 mph NNE | 11% |
| Sunday | 66°F | Cloudy | 10 to 15 mph NE | 9% |
| Sunday Night | 49°F | Chance Rain Showers | 10 to 15 mph ENE | 30% |
| Monday | 61°F | Chance Rain Showers | 10 mph ENE | 30% |
| Monday Night | 44°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph E | 17% |
| Tuesday | 64°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Tuesday Night | 42°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Wednesday | 66°F | Mostly Sunny | 0 to 10 mph SE | 3% |
| Wednesday Night | 47°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SSE | 18% |
| Thursday | 68°F | Slight Chance Rain Showers | 5 to 10 mph SSE | 19% |
| Thursday Night | 50°F | Partly Cloudy | 5 mph SSE | 9% |
| Friday | 71°F | Partly Sunny | 5 to 10 mph SSE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Heron Lake (43.798, -95.320). Updated through the day.
Growing snapshot for Heron Lake
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
162 days
Hardiness zone
5a
More local growing data for Heron Lake: nearby ZIP 56137 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Windom, Mn (10.4 mi from Heron Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.