Frost dates for Dixon Springs Agric Center, IL
At Dixon Springs Agric Center, the median last spring frost (32°F) is Apr 14 and the median first fall frost is Oct 21, for a typical growing season of 189 days. For a 90% chance that the last frost has passed, wait until Apr 30. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 14Last spring frost (median)50% chance of 32°F after this date
- Apr 30Safer planting date10% chance of 32°F after this date
- Oct 21First fall frost (median)50% chance of 32°F by this date
- 189 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 10 | Apr 24 | May 10 |
| 32°F | Mar 28 | Apr 14 | Apr 30 |
| 28°F | Mar 14 | Apr 2 | Apr 19 |
| 24°F | Feb 28 | Mar 20 | Apr 7 |
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 | Sep 29 | Oct 11 | Oct 24 |
| 32°F | Oct 6 | Oct 21 | Nov 2 |
| 28°F | Oct 16 | Oct 31 | Nov 15 |
| 24°F | Oct 27 | Nov 11 | Nov 28 |
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 | 147 days | 170 days | 188 days |
| 32°F | 169 days | 189 days | 208 days |
| 28°F | 190 days | 211 days | 234 days |
| 24°F | 211 days | 235 days | 260 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 |
|---|---|---|---|
| 62985 | 7a | 0 to 5°F | 4 km |
| 62928 | 7a | 0 to 5°F | 10 km |
| 62943 | 7a | 0 to 5°F | 12 km |
| 62938 | 7a | 0 to 5°F | 12 km |
| 62967 | 7a | 0 to 5°F | 17 km |
| 62972 | 7a | 0 to 5°F | 17 km |
| 62995 | 7a | 0 to 5°F | 19 km |
| 62922 | 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 USC00112353, at 37.4389, -88.6678, elevation 161 m (527 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 80.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rosiclare 5nw (23 km)
- Brookport Dam 52 (35 km)
- Harrisburg (36 km)
- Smithland L&d (37 km)
- Grand Chain Dam 53 (42 km)
- Anna 2 NNE (50 km)
- Carbondale Sewage Plant (55 km)
- Cairo 3n (64 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.