Frost dates for Loyalhanna Lake, PA
At Loyalhanna Lake, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 14, for a typical growing season of 163 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 163 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 29 | May 14 | May 31 |
| 32°F | Apr 18 | May 2 | May 18 |
| 28°F | Apr 7 | Apr 22 | May 8 |
| 24°F | Mar 26 | Apr 8 | Apr 22 |
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 22 | Oct 3 | Oct 17 |
| 32°F | Oct 2 | Oct 14 | Oct 27 |
| 28°F | Oct 9 | Oct 25 | Nov 6 |
| 24°F | Oct 22 | Nov 4 | Nov 19 |
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 | 122 days | 142 days | 162 days |
| 32°F | 143 days | 163 days | 183 days |
| 28°F | 164 days | 187 days | 206 days |
| 24°F | 191 days | 209 days | 230 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 |
|---|---|---|---|
| 15684 | 6b | -5 to 0°F | 5 km |
| 15681 | 6b | -5 to 0°F | 5 km |
| 15670 | 6b | -5 to 0°F | 6 km |
| 15624 | 6b | -5 to 0°F | 10 km |
| 15725 | 6b | -5 to 0°F | 11 km |
| 15633 | 6b | -5 to 0°F | 12 km |
| 15635 | 6b | -5 to 0°F | 13 km |
| 15662 | 6b | -5 to 0°F | 14 km |
| 15671 | 6b | -5 to 0°F | 15 km |
| 15727 | 6b | -5 to 0°F | 16 km |
| 15627 | 6b | -5 to 0°F | 17 km |
| 15717 | 6b | -5 to 0°F | 18 km |
| 15620 | 6b | -5 to 0°F | 18 km |
| 15783 | 6b | -5 to 0°F | 18 km |
| 15779 | 6b | -5 to 0°F | 21 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 USC00365212, at 40.4586, -79.4503, elevation 302 m (990 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 130.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Salina 3 W (10 km)
- Murrysville 2 SW (24 km)
- Mount Pleasant (27 km)
- Natrona Lock 4 (29 km)
- Ford City 4 S Dam (29 km)
- Schenley Lock 5 (31 km)
- Indiana 3 SE (32 km)
- Acmetonia Lock 3 (32 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.