Frost dates for Norwalk Wastewater Plant, OH
At Norwalk Wastewater Plant, the median last spring frost (32°F) is Apr 25 and the median first fall frost is Oct 25, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 25Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 183 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 21 | May 4 | May 20 |
| 32°F | Apr 11 | Apr 25 | May 9 |
| 28°F | Mar 31 | Apr 12 | Apr 28 |
| 24°F | Mar 18 | Apr 1 | 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 27 |
| 32°F | Oct 11 | Oct 25 | Nov 7 |
| 28°F | Oct 22 | Nov 5 | Nov 20 |
| 24°F | Nov 1 | Nov 16 | Dec 4 |
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 | 141 days | 160 days | 178 days |
| 32°F | 163 days | 183 days | 202 days |
| 28°F | 186 days | 206 days | 228 days |
| 24°F | 208 days | 228 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 |
|---|---|---|---|
| 44846 | 6b | -5 to 0°F | 6 km |
| 44857 | 6a | -10 to -5°F | 6 km |
| 44847 | 6a | -10 to -5°F | 9 km |
| 44826 | 6a | -10 to -5°F | 12 km |
| 44814 | 6b | -5 to 0°F | 14 km |
| 44839 | 6b | -5 to 0°F | 14 km |
| 44855 | 6a | -10 to -5°F | 18 km |
| 44811 | 6a | -10 to -5°F | 19 km |
| 44828 | 6a | -10 to -5°F | 21 km |
| 44890 | 6a | -10 to -5°F | 22 km |
| 44850 | 6a | -10 to -5°F | 26 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 USC00336118, at 41.2667, -82.6167, elevation 204 m (670 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 124.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sandusky (22 km)
- Oberlin (33 km)
- Elyria Lorain Co Airport (38 km)
- Fremont (43 km)
- Fremont Ag Station (47 km)
- Elyria 3 E (49 km)
- Tiffin (49 km)
- Mansfield Lahm Muni Airport (50 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.