Frost dates for Laurel Summit, PA
At Laurel Summit, the median last spring frost (32°F) is May 6 and the median first fall frost is Oct 12, for a typical growing season of 159 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- May 6Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Oct 12First fall frost (median)50% chance of 32°F by this date
- 159 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 30 | May 16 | Jun 1 |
| 32°F | Apr 22 | May 6 | May 23 |
| 28°F | Apr 14 | Apr 27 | May 15 |
| 24°F | Apr 3 | Apr 17 | May 4 |
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 21 | Oct 3 | Oct 15 |
| 32°F | Oct 1 | Oct 12 | Oct 26 |
| 28°F | Oct 10 | Oct 24 | Nov 5 |
| 24°F | Oct 21 | Nov 3 | Nov 17 |
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 | 119 days | 138 days | 160 days |
| 32°F | 137 days | 159 days | 180 days |
| 28°F | 157 days | 179 days | 198 days |
| 24°F | 176 days | 200 days | 220 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 |
|---|---|---|---|
| 15531 | 6a | -10 to -5°F | 5 km |
| 15544 | 6a | -10 to -5°F | 6 km |
| 15547 | 6a | -10 to -5°F | 6 km |
| 15546 | 6a | -10 to -5°F | 9 km |
| 15561 | 5b | -15 to -10°F | 9 km |
| 15555 | 6a | -10 to -5°F | 9 km |
| 15520 | 6a | -10 to -5°F | 10 km |
| 15937 | 6a | -10 to -5°F | 15 km |
| 15935 | 6a | -10 to -5°F | 15 km |
| 15541 | 6a | -10 to -5°F | 19 km |
| 15563 | 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 USC00364839, at 40.1692, -79.1411, elevation 832 m (2,730 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 146.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Laurel Mountain (5 km)
- Rector 3 SSW (11 km)
- Hidden Valley (17 km)
- Donegal 2 NW (23 km)
- Johnstown Cambria Co Airport (31 km)
- Mount Pleasant (31 km)
- Loyalhanna Lake (42 km)
- Connellsville 2 SSW (43 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.