Frost dates for Cincinnati-Fernbank, OH
At Cincinnati-Fernbank, the median last spring frost (32°F) is Apr 13 and the median first fall frost is Oct 31, for a typical growing season of 197 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 13Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Oct 31First fall frost (median)50% chance of 32°F by this date
- 197 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 12 | Apr 26 | May 13 |
| 32°F | Mar 31 | Apr 13 | May 2 |
| 28°F | Mar 16 | Mar 31 | Apr 15 |
| 24°F | Mar 2 | Mar 20 | Apr 3 |
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 7 | Oct 20 | Nov 1 |
| 32°F | Oct 17 | Oct 31 | Nov 13 |
| 28°F | Oct 30 | Nov 10 | Nov 29 |
| 24°F | Nov 6 | Nov 24 | 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 | 155 days | 174 days | 194 days |
| 32°F | 175 days | 197 days | 219 days |
| 28°F | 202 days | 225 days | 248 days |
| 24°F | 227 days | 251 days | 275 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 |
|---|---|---|---|
| 45233 | 6b | -5 to 0°F | 2 km |
| 45001 | 6b | -5 to 0°F | 3 km |
| 41048 | 6b | -5 to 0°F | 3 km |
| 45051 | 6b | -5 to 0°F | 4 km |
| 45052 | 6b | -5 to 0°F | 8 km |
| 41080 | 6b | -5 to 0°F | 13 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 USC00331550, at 39.1169, -84.6961, elevation 152 m (500 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 101.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cheviot 3 W (4 km)
- Cheviot (8 km)
- Cincinnati Lunken Airport (24 km)
- Fairfield (27 km)
- Hamilton Butler Co Regional Airport (31 km)
- Milford (36 km)
- Chilo Meldahl Locks & Dam (58 km)
- Franklin (58 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.