Frost dates for Marion Muni Airport, OH
At Marion Muni Airport, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 20, for a typical growing season of 178 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zone 6a.
- 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 20First fall frost (median)50% chance of 32°F by this date
- 178 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 22 | May 4 | May 19 |
| 32°F | Apr 11 | Apr 24 | May 10 |
| 28°F | Mar 31 | Apr 15 | Apr 30 |
| 24°F | Mar 18 | Apr 2 | Apr 17 |
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 24 | Oct 7 | Oct 20 |
| 32°F | Oct 5 | Oct 20 | Nov 1 |
| 28°F | Oct 18 | Oct 31 | Nov 13 |
| 24°F | Oct 30 | Nov 10 | 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 | 157 days | 175 days |
| 32°F | 159 days | 178 days | 197 days |
| 28°F | 181 days | 201 days | 221 days |
| 24°F | 204 days | 222 days | 245 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 |
|---|---|---|---|
| 43314 | 6a | -10 to -5°F | 9 km |
| 43320 | 6a | -10 to -5°F | 14 km |
| 43356 | 6a | -10 to -5°F | 18 km |
| 43315 | 6a | -10 to -5°F | 22 km |
| 43003 | 6a | -10 to -5°F | 24 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 USW00004855, at 40.6161, -83.0636, elevation 303 m (994 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 123.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Marion 2 N (6 km)
- Bucyrus (23 km)
- Galion Wtr Wks (25 km)
- Upper Sandusky (30 km)
- Mansfield 5 W (41 km)
- Kenton (46 km)
- Centerburg 2 SE (50 km)
- Fredericktown 4 S (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.