Alto Pass, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alto Pass, a village in Union County, Illinois.
Tonight
56°F
Showers And Thunderstorms
Showers and thunderstorms before 3am. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. South southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.
7-day forecast for Alto Pass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms | 9 mph SSW | 97% |
| Wednesday | 66°F | Partly Sunny | 5 to 9 mph WSW | 6% |
| Wednesday Night | 45°F | Mostly Clear | 3 mph SW | 0% |
| Thursday | 67°F | Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 46°F | Partly Cloudy | 1 to 5 mph W | 5% |
| Friday | 59°F | Partly Sunny | 5 to 9 mph NNW | 2% |
| Friday Night | 41°F | Partly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 56°F | Mostly Sunny | 5 mph NNW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 61°F | Sunny | 1 to 6 mph WNW | 5% |
| Sunday Night | 36°F | Mostly Clear | 2 mph WNW | 5% |
| Monday | 63°F | Sunny | 1 to 7 mph WSW | 2% |
| Monday Night | 40°F | Mostly Clear | 3 mph SW | 0% |
| Tuesday | 68°F | Sunny | 2 to 6 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Alto Pass (37.574, -89.320). Updated through the day.
Growing snapshot for Alto Pass
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
7a
More local growing data for Alto Pass: nearby ZIP 62905 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anna 2 Nne, Il (9 mi from Alto Pass). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.