Frost dates for Greenville Water Plant, OH
At Greenville Water Plant, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 20, for a typical growing season of 180 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 180 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 18 |
| 32°F | Apr 7 | Apr 21 | May 7 |
| 28°F | Mar 26 | Apr 9 | Apr 24 |
| 24°F | Mar 13 | Mar 29 | Apr 12 |
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 8 | Oct 21 |
| 32°F | Oct 6 | Oct 20 | Nov 1 |
| 28°F | Oct 18 | Oct 31 | Nov 13 |
| 24°F | Oct 27 | Nov 9 | Nov 29 |
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 | 138 days | 158 days | 179 days |
| 32°F | 160 days | 180 days | 201 days |
| 28°F | 183 days | 203 days | 224 days |
| 24°F | 205 days | 225 days | 248 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 |
|---|---|---|---|
| 45331 | 6a | -10 to -5°F | 1 km |
| 45352 | 6a | -10 to -5°F | 10 km |
| 45303 | 6a | -10 to -5°F | 12 km |
| 45328 | 6a | -10 to -5°F | 13 km |
| 45346 | 6a | -10 to -5°F | 14 km |
| 45332 | 6a | -10 to -5°F | 16 km |
| 45308 | 6a | -10 to -5°F | 17 km |
| 45304 | 6a | -10 to -5°F | 17 km |
| 45380 | 6a | -10 to -5°F | 20 km |
| 45362 | 6a | -10 to -5°F | 21 km |
| 45348 | 6a | -10 to -5°F | 25 km |
| 45350 | 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 USC00333375, at 40.1033, -84.6503, elevation 314 m (1,030 ft).
- Data quality: Standard (24+ years of data), 28 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
- Piqua Wastewater Plant (36 km)
- Eaton (41 km)
- Dayton Intl Airport (43 km)
- Sidney 1 S (46 km)
- Celina 3 NE (53 km)
- Dayton McD (54 km)
- New Carlisle (56 km)
- Dayton Wright Bros Airport (67 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.