Holcomb, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Holcomb, a community in Ogle County, Illinois.
Overnight
63°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 63, with temperatures rising to around 65 overnight. East southeast wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Holcomb
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Showers And Thunderstorms | 10 mph ESE | 98% |
| Saturday | 78°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 100% |
| Saturday Night | 61°F | Showers And Thunderstorms | 5 to 10 mph E | 91% |
| Sunday | 69°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 55% |
| Sunday Night | 54°F | Chance Rain Showers | 15 mph NE | 30% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 44% |
| Monday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph NE | 15% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 15 mph NE | 12% |
| Wednesday | 66°F | Mostly Sunny | 10 to 15 mph NE | 3% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 5 to 10 mph NNE | 4% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Holcomb (42.065, -89.097). Updated through the day.
Growing snapshot for Holcomb
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
More local growing data for Holcomb: nearby ZIP 61043 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (8.7 mi from Holcomb). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.