Frost dates for Calhoun Lock 2, KY
At Calhoun Lock 2, the median last spring frost (32°F) is Apr 2 and the median first fall frost is Nov 1, for a typical growing season of 211 days. For a 90% chance that the last frost has passed, wait until Apr 20. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 2Last spring frost (median)50% chance of 32°F after this date
- Apr 20Safer planting date10% chance of 32°F after this date
- Nov 1First fall frost (median)50% chance of 32°F by this date
- 211 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 28 | Apr 14 | Apr 30 |
| 32°F | Mar 17 | Apr 2 | Apr 20 |
| 28°F | Mar 4 | Mar 23 | Apr 10 |
| 24°F | Feb 16 | Mar 9 | Mar 29 |
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 10 | Oct 23 | Nov 3 |
| 32°F | Oct 19 | Nov 1 | Nov 15 |
| 28°F | Oct 29 | Nov 10 | Nov 30 |
| 24°F | Nov 6 | Nov 21 | Dec 12 |
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 | 191 days | 213 days |
| 32°F | 191 days | 211 days | 234 days |
| 28°F | 209 days | 235 days | 261 days |
| 24°F | 233 days | 258 days | 286 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 |
|---|---|---|---|
| 42371 | 7a | 0 to 5°F | 3 km |
| 42327 | 7a | 0 to 5°F | 6 km |
| 42350 | 7a | 0 to 5°F | 11 km |
| 42372 | 7a | 0 to 5°F | 14 km |
| 42322 | 7a | 0 to 5°F | 15 km |
| 42352 | 7a | 0 to 5°F | 16 km |
| 42376 | 7a | 0 to 5°F | 19 km |
| 42356 | 7a | 0 to 5°F | 19 km |
| 42301 | 7a | 0 to 5°F | 23 km |
| 42303 | 7a | 0 to 5°F | 31 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 USC00151227, at 37.5319, -87.2669, elevation 122 m (402 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 83.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Madisonville (31 km)
- Beaver Dam (33 km)
- Henderson State Police (39 km)
- Henderson 8 SSW (42 km)
- Providence (46 km)
- Rochester Ferry (48 km)
- Rough River Lake (68 km)
- Princeton 1 SE (70 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.