Frost dates for Franklin Wastewater Plant, IN
At Franklin Wastewater Plant, the median last spring frost (32°F) is Apr 20 and the median first fall frost is Oct 19, for a typical growing season of 180 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 20Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 180 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 18 | May 1 | May 16 |
| 32°F | Apr 7 | Apr 20 | May 7 |
| 28°F | Mar 25 | Apr 8 | Apr 24 |
| 24°F | Mar 13 | Mar 30 | Apr 12 |
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 10 | Oct 23 |
| 32°F | Oct 7 | Oct 19 | Nov 1 |
| 28°F | Oct 17 | Oct 29 | Nov 12 |
| 24°F | Oct 26 | Nov 8 | Nov 25 |
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 | 142 days | 160 days | 179 days |
| 32°F | 160 days | 180 days | 199 days |
| 28°F | 181 days | 201 days | 221 days |
| 24°F | 205 days | 225 days | 248 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 |
|---|---|---|---|
| 46131 | 6b | -5 to 0°F | 1 km |
| 46184 | 6a | -10 to -5°F | 10 km |
| 46162 | 6b | -5 to 0°F | 12 km |
| 46124 | 6b | -5 to 0°F | 13 km |
| 46106 | 6a | -10 to -5°F | 15 km |
| 46181 | 6a | -10 to -5°F | 15 km |
| 46164 | 6a | -10 to -5°F | 20 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 USC00123091, at 39.4683, -86.0411, elevation 220 m (720 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 117.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Shelbyville Sewage Plant (22 km)
- Shelbyville Muni Airport (24 km)
- Indianapolis SE Side (28 km)
- Indianapolis Nwfo (34 km)
- Indianapolis (34 km)
- Columbus (35 km)
- Martinsville 2 SW (36 km)
- Greenfield (43 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.