Keystone, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a city in Benton County, Iowa.

This Afternoon

69°F

Showers And Thunderstorms

Showers and thunderstorms. Mostly cloudy. High near 69, with temperatures falling to around 65 in the afternoon. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

7-day forecast for Keystone

When	Temp	Forecast	Wind	Precip
This Afternoon	69°F	Showers And Thunderstorms	10 mph SE	91%
Tonight	48°F	Showers And Thunderstorms Likely then Mostly Cloudy	10 mph S	60%
Wednesday	54°F	Chance Rain Showers	10 to 15 mph W	34%
Wednesday Night	43°F	Mostly Cloudy then Chance Rain Showers	10 to 15 mph SW	30%
Thursday	53°F	Chance Rain Showers	10 mph NW	52%
Thursday Night	39°F	Slight Chance Rain Showers then Mostly Cloudy	10 mph N	17%
Friday	51°F	Partly Sunny	5 to 10 mph N	2%
Friday Night	32°F	Partly Cloudy	0 to 5 mph NW	1%
Saturday	54°F	Mostly Sunny	0 to 5 mph W	2%
Saturday Night	35°F	Mostly Clear	0 to 5 mph W	4%
Sunday	60°F	Sunny	5 mph W	6%
Sunday Night	36°F	Mostly Clear	5 mph SW	2%
Monday	63°F	Sunny	5 to 10 mph SW	0%
Monday Night	39°F	Mostly Clear	5 mph W	0%

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

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

All Iowa locations ›

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 Nov 4, 2026.