Heron Lake, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Heron Lake, a city in Jackson County, Minnesota.
Today
71°F
Patchy Smoke
Patchy smoke and a slight chance of rain showers. Partly sunny, with a high near 71. North northwest wind 5 to 15 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Heron Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Patchy Smoke | 5 to 15 mph NNW | 20% |
| Tonight | 53°F | Partly Cloudy | 0 to 5 mph NW | 11% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph SSW | 1% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 81°F | Sunny | 5 to 15 mph SSW | 0% |
| Thursday Night | 62°F | Mostly Clear | 10 mph SSW | 3% |
| Friday | 85°F | Sunny | 10 to 15 mph SSW | 9% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 17% |
| Saturday | 86°F | Sunny | 5 to 15 mph SSW | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 10 to 15 mph SE | 27% |
| Sunday | 84°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph ESE | 27% |
| Sunday Night | 66°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 to 15 mph E | 30% |
| Monday | 83°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph E | 30% |
| Monday Night | 65°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph NE | 27% |
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 Aug 4, 2026.