Treynor, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Treynor, a city in Pottawattamie County, Iowa.
Today
80°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms between 8am and noon, then a chance of showers and thunderstorms between noon and 4pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 80, with temperatures falling to around 77 in the afternoon. North northwest wind 5 to 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Treynor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Chance Showers And Thunderstorms | 5 to 9 mph NNW | 47% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 12 mph N | 49% |
| Sunday | 65°F | Chance Rain Showers | 13 mph NE | 37% |
| Sunday Night | 56°F | Chance Rain Showers | 12 mph NE | 37% |
| Monday | 60°F | Rain Showers Likely | 12 mph NE | 58% |
| Monday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 6 to 12 mph NE | 51% |
| Tuesday | 60°F | Partly Sunny | 8 mph ENE | 3% |
| Tuesday Night | 47°F | Partly Cloudy | 7 mph E | 2% |
| Wednesday | 64°F | Mostly Sunny | 6 mph ESE | 3% |
| Wednesday Night | 52°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SE | 23% |
| Thursday | 65°F | Chance Rain Showers | 7 mph SE | 30% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 6 mph ESE | 24% |
| Friday | 66°F | Slight Chance Rain Showers | 8 mph SE | 24% |
| Friday Night | 57°F | Slight Chance Rain Showers | 7 mph SE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Treynor (41.232, -95.606). Updated through the day.
Growing snapshot for Treynor
Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
174 days
Hardiness zone
5b
More local growing data for Treynor: nearby ZIP 51575 weather · frost dates · planting calendar · Iowa frost dates
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Climate data from the nearest NOAA station, Oakland, Ia (12.2 mi from Treynor). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.