Frost dates for Dayton Intl Airport, OH
At Dayton Intl Airport, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 28, for a typical growing season of 194 days. For a 90% chance that the last frost has passed, wait until May 3. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- May 3Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 194 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 13 | Apr 27 | May 13 |
| 32°F | Apr 2 | Apr 16 | May 3 |
| 28°F | Mar 21 | Apr 4 | Apr 19 |
| 24°F | Mar 9 | Mar 25 | Apr 7 |
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 5 | Oct 18 | Oct 30 |
| 32°F | Oct 16 | Oct 28 | Nov 9 |
| 28°F | Oct 26 | Nov 6 | Nov 23 |
| 24°F | Nov 1 | Nov 17 | Dec 5 |
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 | 153 days | 173 days | 191 days |
| 32°F | 175 days | 194 days | 213 days |
| 28°F | 196 days | 215 days | 237 days |
| 24°F | 216 days | 237 days | 260 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 |
|---|---|---|---|
| 45377 | 6b | -5 to 0°F | 0 km |
| 45371 | 6a | -10 to -5°F | 6 km |
| 45414 | 6b | -5 to 0°F | 7 km |
| 45415 | 6b | -5 to 0°F | 9 km |
| 45322 | 6a | -10 to -5°F | 9 km |
| 45383 | 6a | -10 to -5°F | 11 km |
| 45315 | 6a | -10 to -5°F | 12 km |
| 45339 | 6a | -10 to -5°F | 15 km |
| 45354 | 6a | -10 to -5°F | 15 km |
| 45361 | 6a | -10 to -5°F | 18 km |
| 45309 | 6a | -10 to -5°F | 18 km |
| 45337 | 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 USW00093815, at 39.9061, -84.2186, elevation 305 m (1,000 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 110.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dayton McD (16 km)
- New Carlisle (16 km)
- Piqua Wastewater Plant (25 km)
- Dayton Wright Bros Airport (35 km)
- Springfield Water Plant (36 km)
- Franklin (40 km)
- Eaton (40 km)
- Sidney 1 S (41 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.