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Grand Junction, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Grand Junction, a city in Greene County, Iowa.

Overnight
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. South wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for Grand Junction

WhenTempForecastWindPrecip
Overnight 66°F Chance Showers And Thunderstorms 7 mph S 52%
Saturday 79°F Chance Showers And Thunderstorms 7 mph WNW 46%
Saturday Night 60°F Chance Showers And Thunderstorms 9 mph N 28%
Sunday 67°F Chance Rain Showers 12 mph NNE 44%
Sunday Night 55°F Chance Rain Showers 10 mph ENE 42%
Monday 61°F Rain Showers Likely 10 mph ENE 69%
Monday Night 50°F Rain Showers Likely 5 to 8 mph NE 61%
Tuesday 61°F Mostly Cloudy 7 mph ENE 14%
Tuesday Night 46°F Partly Cloudy 5 mph E 2%
Wednesday 66°F Mostly Sunny 3 mph E 3%
Wednesday Night 50°F Mostly Cloudy 2 mph SE 7%
Thursday 68°F Slight Chance Rain Showers 3 mph SE 21%
Thursday Night 53°F Mostly Cloudy then Slight Chance Rain Showers 2 mph SE 15%
Friday 68°F Slight Chance Rain Showers 1 to 5 mph ESE 15%

Forecast source: National Weather Service (api.weather.gov) for Grand Junction (42.033, -94.237). Updated through the day.

Growing snapshot for Grand Junction

Last spring frost
Apr 26
First fall frost
Oct 9
Growing season
164 days
Hardiness zone
5a

More local growing data for Grand Junction: nearby ZIP 50107 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Jefferson, Ia (9.2 mi from Grand Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.