Frost dates for Williamsburg, KY
At Williamsburg, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 22, for a typical growing season of 182 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 182 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 | Apr 30 | May 12 |
| 32°F | Apr 8 | Apr 21 | May 5 |
| 28°F | Mar 27 | Apr 11 | Apr 26 |
| 24°F | Mar 13 | Mar 31 | Apr 16 |
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 30 | Oct 13 | Oct 25 |
| 32°F | Oct 9 | Oct 22 | Nov 3 |
| 28°F | Oct 19 | Nov 1 | Nov 14 |
| 24°F | Oct 29 | Nov 11 | Nov 30 |
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 | 146 days | 164 days | 184 days |
| 32°F | 164 days | 182 days | 201 days |
| 28°F | 182 days | 203 days | 225 days |
| 24°F | 203 days | 226 days | 251 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 |
|---|---|---|---|
| 40769 | 7a | 0 to 5°F | 5 km |
| 40759 | 7a | 0 to 5°F | 12 km |
| 40701 | 7a | 0 to 5°F | 20 km |
| 40763 | 7a | 0 to 5°F | 21 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 USC00158709, at 36.7333, -84.1500, elevation 286 m (940 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 113.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Barbourville (29 km)
- Stearns 2s (30 km)
- London Corbin Airport (40 km)
- Manchester 4 W (55 km)
- Somerset 2 N (59 km)
- Monticello 3 NE (62 km)
- Mount Vernon (71 km)
- Oneida (74 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.