Frost dates for Irwinton 4 WNW, GA
At Irwinton 4 WNW, the median last spring frost (32°F) is Mar 12 and the median first fall frost is Nov 19, for a typical growing season of 255 days. For a 90% chance that the last frost has passed, wait until Apr 1. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 12Last spring frost (median)50% chance of 32°F after this date
- Apr 1Safer planting date10% chance of 32°F after this date
- Nov 19First fall frost (median)50% chance of 32°F by this date
- 255 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 | Mar 5 | Mar 29 | Apr 12 |
| 32°F | Feb 18 | Mar 12 | Apr 1 |
| 28°F | Jan 29 | Feb 25 | Mar 18 |
| 24°F | Jan 6 | Feb 3 | Mar 5 |
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 25 | Nov 6 | Nov 25 |
| 32°F | Nov 3 | Nov 19 | Dec 15 |
| 28°F | Nov 12 | Dec 4 | Jan 6 |
| 24°F | Nov 25 | Dec 24 | Jan 26 |
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 | 204 days | 226 days | 253 days |
| 32°F | 228 days | 255 days | 286 days |
| 28°F | 252 days | 285 days | 319 days |
| 24°F | 280 days | 316 days | 354 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 94% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 31054 | 8b | 15 to 20°F | 7 km |
| 31031 | 8b | 15 to 20°F | 9 km |
| 31042 | 8b | 15 to 20°F | 11 km |
| 31090 | 8b | 15 to 20°F | 18 km |
| 31017 | 8b | 15 to 20°F | 23 km |
| 31003 | 8b | 15 to 20°F | 26 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 USC00094594, at 32.8294, -83.2389, elevation 157 m (515 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 35.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milledgeville (28 km)
- Macon Middle Ga Regional Airport (42 km)
- Warner Robins (43 km)
- Dublin (44 km)
- Sandersville (44 km)
- Dublin 2 (44 km)
- Hawkinsville (64 km)
- Kite (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.