Frost dates for Louisville Bowman Field, KY
At Louisville Bowman Field, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Nov 3, for a typical growing season of 214 days. For a 90% chance that the last frost has passed, wait until Apr 19. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 3Last spring frost (median)50% chance of 32°F after this date
- Apr 19Safer planting date10% chance of 32°F after this date
- Nov 3First fall frost (median)50% chance of 32°F by this date
- 214 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 2 | Apr 16 | May 3 |
| 32°F | Mar 18 | Apr 3 | Apr 19 |
| 28°F | Mar 4 | Mar 22 | Apr 5 |
| 24°F | Feb 20 | Mar 9 | Mar 26 |
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 12 | Oct 23 | Nov 3 |
| 32°F | Oct 21 | Nov 3 | Nov 16 |
| 28°F | Nov 1 | Nov 13 | Dec 1 |
| 24°F | Nov 8 | Nov 24 | Dec 15 |
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 | 169 days | 189 days | 209 days |
| 32°F | 193 days | 214 days | 232 days |
| 28°F | 215 days | 237 days | 262 days |
| 24°F | 237 days | 261 days | 288 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 |
|---|---|---|---|
| 40205 | 7a | 0 to 5°F | 2 km |
| 40280 | 7a | 0 to 5°F | 3 km |
| 40041 | 7a | 0 to 5°F | 3 km |
| 40207 | 7a | 0 to 5°F | 4 km |
| 40220 | 7a | 0 to 5°F | 4 km |
| 40218 | 7a | 0 to 5°F | 4 km |
| 40206 | 7a | 0 to 5°F | 5 km |
| 40204 | 7a | 0 to 5°F | 5 km |
| 40222 | 7a | 0 to 5°F | 6 km |
| 40025 | 7a | 0 to 5°F | 8 km |
| 40242 | 7a | 0 to 5°F | 9 km |
| 40241 | 7a | 0 to 5°F | 11 km |
| 40223 | 7a | 0 to 5°F | 11 km |
| 40243 | 7a | 0 to 5°F | 12 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 USW00013810, at 38.2281, -85.6636, elevation 165 m (540 ft).
- Data quality: Representative (10+ years), 20 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
- Louisville Intl Airport (8 km)
- Louisville McAlpine (12 km)
- Louisville WFO (13 km)
- Crestwood 4ne (26 km)
- Bernheim Forest (35 km)
- Taylorsville Lake (40 km)
- Shelbyville 1 E (41 km)
- Brandenburg (50 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.