Alto Pass, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alto Pass, a village in Union County, Illinois.
Today
87°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny, with a high near 87. East northeast wind 0 to 3 mph.
7-day forecast for Alto Pass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Patchy Fog then Sunny | 0 to 3 mph ENE | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph E | 0% |
| Wednesday | 89°F | Sunny | 2 mph S | 0% |
| Wednesday Night | 69°F | Partly Cloudy | 3 mph S | 3% |
| Thursday | 88°F | Chance Showers And Thunderstorms | 3 to 7 mph SSW | 25% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 6 mph S | 59% |
| Friday | 88°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph SSW | 59% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 3 mph SSW | 41% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 5 mph SSW | 37% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 17% |
| Sunday | 90°F | Sunny | 3 to 8 mph SSW | 8% |
| Sunday Night | 72°F | Mostly Clear | 3 to 7 mph SSW | 5% |
| Monday | 91°F | Sunny | 5 to 8 mph SSW | 6% |
| Monday Night | 73°F | Mostly Clear | 7 mph SSW | 4% |
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 Aug 4, 2026.