Frost dates for Anna 2 NNE, IL
At Anna 2 NNE, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Oct 29, for a typical growing season of 203 days. For a 90% chance that the last frost has passed, wait until Apr 26. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- Apr 26Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 203 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 4 | Apr 21 | May 6 |
| 32°F | Mar 22 | Apr 8 | Apr 26 |
| 28°F | Mar 10 | Mar 29 | Apr 16 |
| 24°F | Feb 25 | Mar 15 | Apr 4 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 6 | Oct 19 | Oct 31 |
| 32°F | Oct 17 | Oct 29 | Nov 10 |
| 28°F | Oct 27 | Nov 8 | Nov 25 |
| 24°F | Nov 4 | Nov 19 | Dec 7 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 162 days | 181 days | 201 days |
| 32°F | 182 days | 203 days | 225 days |
| 28°F | 203 days | 225 days | 249 days |
| 24°F | 223 days | 249 days | 274 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 62906 | 7a | 0 to 5°F | 5 km |
| 62920 | 7a | 0 to 5°F | 8 km |
| 62952 | 7a | 0 to 5°F | 12 km |
| 62905 | 7a | 0 to 5°F | 14 km |
| 62926 | 7a | 0 to 5°F | 16 km |
| 62961 | 7a | 0 to 5°F | 16 km |
| 62912 | 7a | 0 to 5°F | 18 km |
| 62998 | 7a | 0 to 5°F | 20 km |
| 62939 | 7a | 0 to 5°F | 24 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00110187, at 37.4814, -89.2344, elevation 195 m (640 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 95.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Carbondale Sewage Plant (28 km)
- Carbondale Southern Il Airport (33 km)
- Grand Chain Dam 53 (35 km)
- Cairo 3n (49 km)
- Dixon Springs Agric Center (50 km)
- Du Quoin 4 SE (56 km)
- Brookport Dam 52 (65 km)
- Rend Lake Dam (66 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.