Ottosen, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ottosen, a city in Humboldt County, Iowa.
Overnight
65°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 4am, then patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 65, with temperatures rising to around 67 overnight. East northeast wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Ottosen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Patchy Fog | 7 mph ENE | 51% |
| Saturday | 72°F | Patchy Fog | 6 to 9 mph NNW | 45% |
| Saturday Night | 58°F | Slight Chance Rain Showers then Cloudy | 10 to 14 mph NNE | 23% |
| Sunday | 67°F | Slight Chance Rain Showers | 15 mph NE | 21% |
| Sunday Night | 53°F | Chance Rain Showers | 12 mph ENE | 38% |
| Monday | 62°F | Chance Rain Showers | 12 mph ENE | 55% |
| Monday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 5 to 9 mph ENE | 51% |
| Tuesday | 62°F | Mostly Sunny | 7 mph ENE | 11% |
| Tuesday Night | 44°F | Mostly Clear | 2 to 6 mph E | 1% |
| Wednesday | 66°F | Sunny | 5 mph ESE | 3% |
| Wednesday Night | 49°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph SE | 12% |
| Thursday | 68°F | Slight Chance Rain Showers | 2 to 6 mph SE | 21% |
| Thursday Night | 52°F | Mostly Cloudy | 3 mph SE | 9% |
| Friday | 70°F | Partly Sunny | 2 to 7 mph SE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Ottosen (42.898, -94.376). Updated through the day.
Growing snapshot for Ottosen
Last spring frost
Apr 30
First fall frost
Oct 6
Growing season
160 days
Hardiness zone
5a
More local growing data for Ottosen: nearby ZIP 50570 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Algona, Ia (13.9 mi from Ottosen). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.