Frost dates for Bowling Green Wastewater Plant, OH
At Bowling Green Wastewater Plant, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 25, for a typical growing season of 186 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 186 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 19 | May 1 | May 16 |
| 32°F | Apr 8 | Apr 22 | May 7 |
| 28°F | Mar 28 | Apr 11 | Apr 25 |
| 24°F | Mar 15 | Mar 31 | Apr 13 |
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 28 |
| 32°F | Oct 12 | Oct 25 | Nov 8 |
| 28°F | Oct 22 | Nov 5 | Nov 19 |
| 24°F | Nov 1 | Nov 16 | Dec 3 |
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 | 144 days | 164 days | 183 days |
| 32°F | 166 days | 186 days | 205 days |
| 28°F | 188 days | 208 days | 228 days |
| 24°F | 210 days | 230 days | 252 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 |
|---|---|---|---|
| 43403 | 6b | -5 to 0°F | 2 km |
| 43402 | 6b | -5 to 0°F | 5 km |
| 43451 | 6b | -5 to 0°F | 7 km |
| 43414 | 6b | -5 to 0°F | 8 km |
| 43450 | 6b | -5 to 0°F | 10 km |
| 43565 | 6b | -5 to 0°F | 12 km |
| 43525 | 6b | -5 to 0°F | 12 km |
| 43466 | 6b | -5 to 0°F | 13 km |
| 43437 | 6a | -10 to -5°F | 14 km |
| 43406 | 6b | -5 to 0°F | 15 km |
| 43467 | 6b | -5 to 0°F | 19 km |
| 43457 | 6b | -5 to 0°F | 20 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 USC00330862, at 41.3831, -83.6111, elevation 206 m (675 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 126.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hoytville 2 NE (23 km)
- Toledo Metcalf Field (23 km)
- Toledo Express Airport (28 km)
- Fremont Ag Station (38 km)
- Findlay Wpcc (38 km)
- Findlay Airport (41 km)
- Fremont (41 km)
- Napoleon (42 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.