Monticello, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monticello, a city in Jones County, Iowa.
Today
52°F
Slight Chance Rain Showers
A slight chance of rain showers before 3pm, then a slight chance of drizzle. Cloudy, with a high near 52. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Monticello
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Slight Chance Rain Showers | 10 to 15 mph SW | 23% |
| Tonight | 46°F | Slight Chance Rain Showers | 10 mph W | 24% |
| Thursday | 51°F | Chance Rain Showers | 10 mph NW | 33% |
| Thursday Night | 36°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday | 49°F | Mostly Sunny | 0 to 10 mph N | 1% |
| Friday Night | 28°F | Mostly Clear | 0 mph | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 32°F | Mostly Clear | 0 mph | 2% |
| Sunday | 57°F | Sunny | 0 to 10 mph W | 2% |
| Sunday Night | 33°F | Clear | 0 to 5 mph W | 0% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 0 to 5 mph NW | 0% |
| Tuesday Night | 37°F | Partly Cloudy | 0 mph | 1% |
Forecast source: National Weather Service (api.weather.gov) for Monticello (42.230, -91.186). Updated through the day.
Growing snapshot for Monticello
Last spring frost
May 1
First fall frost
Oct 4
Growing season
154 days
Hardiness zone
5a
More local growing data for Monticello: nearby ZIP 52310 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anamosa 1 Wnw, Ia (9 mi from Monticello). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.