Frost dates for Huntsville 3N, OH
At Huntsville 3N, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 27, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 6. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 6Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 188 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 6a (-10 to -5°F) · see all zone 6a frost dates
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 2 | May 16 |
| 32°F | Apr 8 | Apr 22 | May 6 |
| 28°F | Mar 28 | Apr 10 | Apr 23 |
| 24°F | Mar 13 | Mar 31 | Apr 15 |
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 1 | Oct 15 | Oct 28 |
| 32°F | Oct 14 | Oct 27 | Nov 7 |
| 28°F | Oct 24 | Nov 6 | Nov 22 |
| 24°F | Nov 3 | Nov 17 | Dec 7 |
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 | 166 days | 185 days |
| 32°F | 168 days | 188 days | 208 days |
| 28°F | 191 days | 211 days | 232 days |
| 24°F | 213 days | 232 days | 255 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 |
|---|---|---|---|
| 43324 | 6a | -10 to -5°F | 4 km |
| 43310 | 6a | -10 to -5°F | 6 km |
| 43348 | 6a | -10 to -5°F | 7 km |
| 43331 | 6a | -10 to -5°F | 10 km |
| 43333 | 6a | -10 to -5°F | 11 km |
| 43346 | 6a | -10 to -5°F | 11 km |
| 43347 | 6a | -10 to -5°F | 13 km |
| 45870 | 6a | -10 to -5°F | 14 km |
| 45334 | 6a | -10 to -5°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 USC00333915, at 40.4800, -83.8128, elevation 315 m (1,034 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 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
- Bellefontaine (14 km)
- Kenton (26 km)
- Lima Allen Co Airport (31 km)
- Sidney 1 S (37 km)
- Lima Wastewater Plant (38 km)
- Urbana Wastewater Plant (42 km)
- Piqua Wastewater Plant (53 km)
- Pandora (53 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.