Frost dates for London Fish Hatchery, OH
At London Fish Hatchery, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 18, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Oct 18First fall frost (median)50% chance of 32°F by this date
- 175 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 20 | May 4 | May 20 |
| 32°F | Apr 10 | Apr 24 | May 10 |
| 28°F | Mar 31 | Apr 14 | Apr 30 |
| 24°F | Mar 16 | 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 23 | Oct 7 | Oct 20 |
| 32°F | Oct 5 | Oct 18 | Nov 1 |
| 28°F | Oct 15 | Oct 29 | Nov 12 |
| 24°F | Oct 25 | Nov 8 | Nov 27 |
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 | 136 days | 155 days | 174 days |
| 32°F | 157 days | 175 days | 195 days |
| 28°F | 176 days | 198 days | 219 days |
| 24°F | 199 days | 220 days | 246 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 |
|---|---|---|---|
| 43140 | 6a | -10 to -5°F | 7 km |
| 45369 | 6a | -10 to -5°F | 9 km |
| 45368 | 6a | -10 to -5°F | 13 km |
| 43010 | 6a | -10 to -5°F | 15 km |
| 43153 | 6a | -10 to -5°F | 18 km |
| 43044 | 6a | -10 to -5°F | 18 km |
| 43162 | 6b | -5 to 0°F | 18 km |
| 43151 | 6a | -10 to -5°F | 18 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 USC00334681, at 39.8972, -83.5097, elevation 341 m (1,120 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 132.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Springfield Water Plant (27 km)
- Urbana Wastewater Plant (32 km)
- Marysville (39 km)
- Washington Court House (41 km)
- Columbus Ohio State Univ Airport (42 km)
- Columbus Wcmh (44 km)
- New Carlisle (45 km)
- Xenia 6 SSE (47 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.