Frost dates for Bellefontaine, OH
At Bellefontaine, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 20, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 20First 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 5 | May 21 |
| 32°F | Apr 12 | Apr 26 | May 12 |
| 28°F | Apr 1 | Apr 16 | May 2 |
| 24°F | Mar 20 | Apr 4 | Apr 19 |
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 26 | Oct 9 | Oct 22 |
| 32°F | Oct 7 | Oct 20 | Oct 31 |
| 28°F | Oct 16 | Oct 30 | Nov 12 |
| 24°F | Oct 29 | Nov 9 | Nov 26 |
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 | 137 days | 155 days | 173 days |
| 32°F | 155 days | 175 days | 194 days |
| 28°F | 175 days | 196 days | 217 days |
| 24°F | 197 days | 218 days | 240 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 |
|---|---|---|---|
| 43311 | 6a | -10 to -5°F | 2 km |
| 43357 | 6a | -10 to -5°F | 11 km |
| 43360 | 6a | -10 to -5°F | 11 km |
| 43318 | 6a | -10 to -5°F | 13 km |
| 43319 | 6a | -10 to -5°F | 18 km |
| 43336 | 6a | -10 to -5°F | 19 km |
| 43358 | 6a | -10 to -5°F | 21 km |
| 43067 | 6a | -10 to -5°F | 25 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 USC00330563, at 40.3536, -83.7753, elevation 358 m (1,176 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 127.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Huntsville 3n (14 km)
- Urbana Wastewater Plant (28 km)
- Sidney 1 S (33 km)
- Kenton (36 km)
- Springfield Water Plant (42 km)
- Lima Allen Co Airport (45 km)
- Piqua Wastewater Plant (46 km)
- Marysville (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.