Marathon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Buena Vista County, Iowa.
This Afternoon
66°F
Patchy Fog
Patchy fog. Cloudy, with a high near 66. North wind around 10 mph.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Patchy Fog | 10 mph N | 5% |
| Tonight | 56°F | Patchy Fog | 10 mph NNE | 10% |
| Sunday | 66°F | Chance Rain Showers | 15 mph NE | 27% |
| Sunday Night | 51°F | Rain Showers Likely | 10 mph ENE | 63% |
| Monday | 57°F | Rain Showers | 10 mph NE | 79% |
| Monday Night | 47°F | Rain Showers Likely then Mostly Cloudy | 5 to 10 mph NE | 56% |
| Tuesday | 61°F | Partly Sunny | 5 mph ENE | 6% |
| Tuesday Night | 44°F | Partly Cloudy | 0 to 5 mph E | 0% |
| Wednesday | 65°F | Mostly Sunny | 0 to 5 mph ESE | 2% |
| Wednesday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 23% |
| Thursday | 68°F | Chance Rain Showers | 5 to 10 mph SSE | 38% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 0 to 5 mph SE | 20% |
| Friday | 71°F | Slight Chance Rain Showers | 0 to 5 mph ESE | 15% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 22% |
Forecast source: National Weather Service (api.weather.gov) for Marathon (42.860, -94.983). Updated through the day.
Growing snapshot for Marathon
Last spring frost
Apr 30
First fall frost
Oct 5
Growing season
159 days
Hardiness zone
5a
More local growing data for Marathon: nearby ZIP 50565 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sioux Rapids 4 E, Ia (4.1 mi from Marathon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.