Frost dates for Rosiclare 5nw, IL
At Rosiclare 5nw, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 20, for a typical growing season of 181 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 181 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 15 | May 2 | May 18 |
| 32°F | Apr 3 | Apr 19 | May 8 |
| 28°F | Mar 20 | Apr 6 | Apr 26 |
| 24°F | Mar 5 | Mar 26 | Apr 13 |
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 28 | Oct 11 | Oct 21 |
| 32°F | Oct 7 | Oct 20 | Oct 30 |
| 28°F | Oct 16 | Oct 29 | Nov 9 |
| 24°F | Oct 28 | Nov 8 | Nov 27 |
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 | 141 days | 161 days | 181 days |
| 32°F | 160 days | 181 days | 201 days |
| 28°F | 180 days | 204 days | 227 days |
| 24°F | 205 days | 229 days | 254 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 |
|---|---|---|---|
| 62982 | 7a | 0 to 5°F | 7 km |
| 62947 | 7a | 0 to 5°F | 7 km |
| 62931 | 7a | 0 to 5°F | 13 km |
| 62919 | 7a | 0 to 5°F | 25 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 USC00117487, at 37.4747, -88.4122, elevation 122 m (400 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 109.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dixon Springs Agric Center (23 km)
- Harrisburg (31 km)
- Smithland L&d (35 km)
- Brookport Dam 52 (44 km)
- Grand Chain Dam 53 (63 km)
- McLeansboro (69 km)
- Carmi 3 (70 km)
- Carbondale Sewage Plant (72 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.