Keystone, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a city in Benton County, Iowa.
Overnight
48°F
Slight Chance Rain Showers
A slight chance of rain showers after 4am. Cloudy. Low around 48, with temperatures rising to around 50 overnight. West wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Slight Chance Rain Showers | 10 mph W | 19% |
| Wednesday | 52°F | Chance Rain Showers | 10 to 15 mph W | 26% |
| Wednesday Night | 43°F | Slight Chance Rain Showers | 10 to 15 mph W | 17% |
| Thursday | 54°F | Chance Rain Showers | 10 mph NW | 47% |
| Thursday Night | 37°F | Mostly Cloudy | 10 mph N | 9% |
| Friday | 49°F | Mostly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 28°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 mph W | 2% |
| Sunday Night | 35°F | Clear | 5 mph SW | 0% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 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
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
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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 Nov 4, 2026.