Frost dates for Mount Pleasant, PA
At Mount Pleasant, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 13, for a typical growing season of 164 days. For a 90% chance that the last frost has passed, wait until May 19. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 19Safer planting date10% chance of 32°F after this date
- Oct 13First fall frost (median)50% chance of 32°F by this date
- 164 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 28 | May 13 | May 29 |
| 32°F | Apr 17 | May 1 | May 19 |
| 28°F | Apr 6 | Apr 20 | May 8 |
| 24°F | Mar 23 | Apr 8 | Apr 23 |
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 14 |
| 32°F | Oct 3 | Oct 13 | Oct 26 |
| 28°F | Oct 10 | Oct 24 | Nov 8 |
| 24°F | Oct 23 | Nov 5 | Nov 23 |
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 | 121 days | 143 days | 163 days |
| 32°F | 145 days | 164 days | 184 days |
| 28°F | 165 days | 186 days | 207 days |
| 24°F | 190 days | 212 days | 237 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 |
|---|---|---|---|
| 15674 | 6b | -5 to 0°F | 1 km |
| 15689 | 6b | -5 to 0°F | 1 km |
| 15676 | 6b | -5 to 0°F | 5 km |
| 15616 | 6b | -5 to 0°F | 5 km |
| 15666 | 6b | -5 to 0°F | 6 km |
| 15697 | 6b | -5 to 0°F | 7 km |
| 15639 | 6b | -5 to 0°F | 8 km |
| 15688 | 6b | -5 to 0°F | 9 km |
| 15693 | 6b | -5 to 0°F | 9 km |
| 15638 | 6b | -5 to 0°F | 10 km |
| 15672 | 6b | -5 to 0°F | 11 km |
| 15601 | 6b | -5 to 0°F | 11 km |
| 15650 | 6b | -5 to 0°F | 11 km |
| 15619 | 6b | -5 to 0°F | 12 km |
| 15612 | 6b | -5 to 0°F | 12 km |
| 15679 | 6b | -5 to 0°F | 14 km |
| 15617 | 6b | -5 to 0°F | 14 km |
| 15663 | 6b | -5 to 0°F | 16 km |
| 15698 | 6b | -5 to 0°F | 16 km |
| 15661 | 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 USC00366042, at 40.2156, -79.4994, elevation 306 m (1,003 ft).
- Data quality: Representative (10+ years), 13 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
- Donegal 2 NW (13 km)
- Rector 3 SSW (21 km)
- Connellsville 2 SSW (26 km)
- Laurel Mountain (26 km)
- Loyalhanna Lake (27 km)
- Hidden Valley (28 km)
- Murrysville 2 SW (29 km)
- Laurel Summit (31 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.