Frost dates for Piqua Wastewater Plant, OH
At Piqua Wastewater Plant, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 23, for a typical growing season of 186 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 23First 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 16 | Apr 29 | May 14 |
| 32°F | Apr 5 | Apr 18 | May 5 |
| 28°F | Mar 23 | Apr 5 | Apr 20 |
| 24°F | Mar 11 | Mar 27 | Apr 10 |
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 25 |
| 32°F | Oct 9 | Oct 23 | Nov 4 |
| 28°F | Oct 20 | Nov 3 | Nov 18 |
| 24°F | Nov 1 | Nov 16 | Dec 2 |
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 | 145 days | 165 days | 184 days |
| 32°F | 164 days | 186 days | 206 days |
| 28°F | 188 days | 209 days | 230 days |
| 24°F | 213 days | 234 days | 257 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 |
|---|---|---|---|
| 45356 | 6a | -10 to -5°F | 4 km |
| 45318 | 6a | -10 to -5°F | 10 km |
| 45373 | 6a | -10 to -5°F | 11 km |
| 45326 | 6a | -10 to -5°F | 12 km |
| 45359 | 6a | -10 to -5°F | 13 km |
| 45363 | 6a | -10 to -5°F | 19 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 USC00336650, at 40.1311, -84.2344, elevation 260 m (853 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 111.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sidney 1 S (17 km)
- Dayton Intl Airport (25 km)
- New Carlisle (28 km)
- Greenville Water Plant (36 km)
- Urbana Wastewater Plant (39 km)
- Springfield Water Plant (40 km)
- Dayton McD (41 km)
- Bellefontaine (46 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.