Grand Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Junction, a city in Greene County, Iowa.
Tonight
43°F
Rain Showers
Rain showers before 5am. Cloudy. Low around 43, with temperatures rising to around 46 overnight. Northwest wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Grand Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Rain Showers | 10 to 16 mph NW | 81% |
| Wednesday | 51°F | Chance Rain Showers | 14 mph W | 27% |
| Wednesday Night | 41°F | Cloudy then Chance Rain Showers | 8 to 12 mph W | 43% |
| Thursday | 52°F | Rain Showers Likely | 10 mph NW | 58% |
| Thursday Night | 37°F | Mostly Cloudy | 5 to 8 mph N | 12% |
| Friday | 52°F | Partly Sunny | 5 mph N | 1% |
| Friday Night | 32°F | Partly Cloudy | 1 mph NW | 0% |
| Saturday | 57°F | Mostly Sunny | 3 mph WSW | 1% |
| Saturday Night | 36°F | Mostly Clear | 3 mph W | 4% |
| Sunday | 62°F | Sunny | 5 mph W | 5% |
| Sunday Night | 38°F | Mostly Clear | 5 mph SW | 1% |
| Monday | 65°F | Sunny | 5 to 9 mph WSW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 63°F | Mostly Sunny | 5 mph WNW | 0% |
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
Nearby towns & communities
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 Nov 4, 2026.