Frost dates for Schenley Lock 5, PA
At Schenley Lock 5, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 30, for a typical growing season of 190 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 30First fall frost (median)50% chance of 32°F by this date
- 190 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 3 | May 19 |
| 32°F | Apr 6 | Apr 21 | May 9 |
| 28°F | Mar 23 | Apr 7 | Apr 23 |
| 24°F | Mar 11 | Mar 28 | Apr 11 |
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 4 | Oct 17 | Oct 29 |
| 32°F | Oct 15 | Oct 30 | Nov 12 |
| 28°F | Oct 30 | Nov 11 | Nov 27 |
| 24°F | Nov 7 | Nov 20 | Dec 9 |
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 | 186 days |
| 32°F | 170 days | 190 days | 210 days |
| 28°F | 195 days | 215 days | 238 days |
| 24°F | 218 days | 240 days | 263 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 |
|---|---|---|---|
| 16229 | 6b | -5 to 0°F | 3 km |
| 15682 | 6b | -5 to 0°F | 3 km |
| 15656 | 6b | -5 to 0°F | 6 km |
| 16055 | 6b | -5 to 0°F | 8 km |
| 15641 | 6b | -5 to 0°F | 9 km |
| 16023 | 6a | -10 to -5°F | 13 km |
| 16262 | 6b | -5 to 0°F | 17 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 USC00367863, at 40.6831, -79.6683, elevation 239 m (783 ft).
- Data quality: Estimated from nearby stations (2+ years), 6 years of freeze data.
- Average days per year at or below 32°F: 118.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Natrona Lock 4 (9 km)
- Ford City 4 S Dam (14 km)
- Acmetonia Lock 3 (21 km)
- Salina 3 W (22 km)
- Butler 2 SW (27 km)
- Murrysville 2 SW (31 km)
- Loyalhanna Lake (31 km)
- Braddock Lock 2 (36 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.