Frost dates for Emsworth L/d Ohio River, PA
At Emsworth L/d Ohio River, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 27, for a typical growing season of 186 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 27First 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 20 | May 5 | May 21 |
| 32°F | Apr 9 | Apr 24 | May 11 |
| 28°F | Mar 28 | Apr 12 | Apr 26 |
| 24°F | Mar 15 | Apr 1 | 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 | Oct 2 | Oct 16 | Oct 28 |
| 32°F | Oct 13 | Oct 27 | Nov 7 |
| 28°F | Oct 24 | Nov 5 | Nov 20 |
| 24°F | Nov 2 | Nov 16 | Dec 4 |
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 | 142 days | 163 days | 185 days |
| 32°F | 165 days | 186 days | 205 days |
| 28°F | 189 days | 209 days | 229 days |
| 24°F | 210 days | 232 days | 256 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 |
|---|---|---|---|
| 15202 | 6b | -5 to 0°F | 1 km |
| 15225 | 7a | 0 to 5°F | 2 km |
| 15229 | 6b | -5 to 0°F | 5 km |
| 15136 | 6b | -5 to 0°F | 5 km |
| 15204 | 7a | 0 to 5°F | 6 km |
| 15237 | 6b | -5 to 0°F | 6 km |
| 15214 | 6b | -5 to 0°F | 7 km |
| 15233 | 7a | 0 to 5°F | 7 km |
| 15205 | 6b | -5 to 0°F | 8 km |
| 15290 | 7a | 0 to 5°F | 8 km |
| 15212 | 6b | -5 to 0°F | 10 km |
| 15209 | 6b | -5 to 0°F | 10 km |
| 15220 | 6b | -5 to 0°F | 10 km |
| 15222 | 7a | 0 to 5°F | 10 km |
| 15211 | 6b | -5 to 0°F | 10 km |
| 15106 | 6b | -5 to 0°F | 11 km |
| 15223 | 6b | -5 to 0°F | 12 km |
| 15090 | 6b | -5 to 0°F | 14 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 USC00362574, at 40.5044, -80.0889, elevation 218 m (717 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 107.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Pittsburgh Intl Airport (11 km)
- Glenwillard Dashields L&d (11 km)
- Moon Twp (11 km)
- Pittsburgh Allegheny Co Airport (22 km)
- Braddock Lock 2 (23 km)
- Acmetonia Lock 3 (23 km)
- McKeesport (27 km)
- Montgomery L&d (30 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.