Keystone, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a city in Benton County, Iowa.
Today
81°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 11am. Partly sunny. High near 81, with temperatures falling to around 78 in the afternoon. West wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 40% |
| Tonight | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 79% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 5 mph N | 66% |
| Wednesday Night | 56°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 28% |
| Thursday | 80°F | Sunny | 0 to 5 mph NE | 6% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 1% |
| Friday | 83°F | Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 64°F | Mostly Clear | 5 mph S | 13% |
| Saturday | 87°F | Sunny | 5 mph S | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 16% |
| Sunday | 88°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph S | 16% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 37% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 37% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 mph E | 34% |
Forecast source: National Weather Service (api.weather.gov) for Keystone (41.999, -92.198). Updated through the day.
Growing snapshot for Keystone
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
More local growing data for Keystone: nearby ZIP 52249 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Atkins
Belle Plaine
Blairstown
Dysart
Garrison
Luzerne
Mount Auburn
Newhall
Norway
Shellsburg
Urbana
Van Horne
Vinton
Walford
Watkins
Climate data from the nearest NOAA station, Belle Plaine, Ia (9.7 mi from Keystone). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.