Keystone, IN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a community in Wells County, Indiana.

This Afternoon

74°F

Mostly Sunny

Mostly sunny, with a high near 74. East wind 5 to 10 mph.

7-day forecast for Keystone

When	Temp	Forecast	Wind	Precip
This Afternoon	74°F	Mostly Sunny	5 to 10 mph E	3%
Tonight	58°F	Partly Cloudy	5 mph E	12%
Saturday	80°F	Chance Showers And Thunderstorms then Showers And Thunderstorms	5 mph SE	88%
Saturday Night	66°F	Showers And Thunderstorms Likely then Chance Showers And Thunderstorms	5 mph S	63%
Sunday	78°F	Showers And Thunderstorms	5 to 10 mph NW	76%
Sunday Night	57°F	Showers And Thunderstorms	10 mph NE	76%
Monday	67°F	Showers And Thunderstorms Likely	10 to 15 mph NE	64%
Monday Night	53°F	Chance Showers And Thunderstorms	10 to 15 mph NE	39%
Tuesday	65°F	Chance Showers And Thunderstorms	10 to 15 mph NE	29%
Tuesday Night	54°F	Slight Chance Rain Showers	5 to 15 mph NE	18%
Wednesday	66°F	Slight Chance Rain Showers	5 to 10 mph NE	17%
Wednesday Night	54°F	Slight Chance Rain Showers then Mostly Cloudy	5 to 10 mph N	15%
Thursday	69°F	Mostly Cloudy	5 to 10 mph N	8%
Thursday Night	53°F	Mostly Cloudy	5 to 10 mph N	8%

Forecast source: National Weather Service (api.weather.gov) for Keystone (40.592, -85.262). Updated through the day.

Growing snapshot for Keystone

Last spring frost

Apr 22

First fall frost

Oct 22

Growing season

181 days

Hardiness zone

More local growing data for Keystone: nearby ZIP 46781 weather · frost dates · planting calendar · Indiana frost dates

Nearby towns & communities

Bluffton Craigville Liberty Center Markle Ossian Petroleum Poneto Tocsin Uniondale Vera Cruz Zanesville

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Climate data from the nearest NOAA station, Hartford City 4 Ese, In (13.6 mi from Keystone). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.