Frost dates for Murrysville 2 SW, PA
At Murrysville 2 SW, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 25, for a typical growing season of 186 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 25First 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 19 | May 5 | May 20 |
| 32°F | Apr 7 | Apr 22 | May 12 |
| 28°F | Mar 24 | Apr 7 | Apr 23 |
| 24°F | Mar 13 | Mar 28 | Apr 10 |
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 1 | Oct 13 | Oct 26 |
| 32°F | Oct 10 | Oct 25 | Nov 6 |
| 28°F | Oct 23 | Nov 5 | Nov 20 |
| 24°F | Nov 3 | Nov 17 | Dec 3 |
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 | 140 days | 161 days | 181 days |
| 32°F | 163 days | 186 days | 207 days |
| 28°F | 191 days | 213 days | 234 days |
| 24°F | 214 days | 235 days | 258 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 |
|---|---|---|---|
| 15085 | 6b | -5 to 0°F | 3 km |
| 15146 | 6b | -5 to 0°F | 4 km |
| 15140 | 6b | -5 to 0°F | 5 km |
| 15615 | 6b | -5 to 0°F | 6 km |
| 15668 | 6b | -5 to 0°F | 7 km |
| 15647 | 6b | -5 to 0°F | 8 km |
| 15636 | 6b | -5 to 0°F | 8 km |
| 15239 | 6b | -5 to 0°F | 8 km |
| 15665 | 6b | -5 to 0°F | 10 km |
| 15692 | 6b | -5 to 0°F | 10 km |
| 15623 | 6b | -5 to 0°F | 10 km |
| 15642 | 6b | -5 to 0°F | 10 km |
| 15675 | 6b | -5 to 0°F | 11 km |
| 15644 | 6b | -5 to 0°F | 12 km |
| 15611 | 6b | -5 to 0°F | 13 km |
| 15691 | 6b | -5 to 0°F | 13 km |
| 15634 | 6b | -5 to 0°F | 14 km |
| 15625 | 6b | -5 to 0°F | 16 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 USC00366111, at 40.4119, -79.7244, elevation 262 m (860 ft).
- Data quality: Estimated from nearby stations (2+ years), 6 years of freeze data.
- Average days per year at or below 32°F: 129.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Braddock Lock 2 (12 km)
- McKeesport (14 km)
- Acmetonia Lock 3 (16 km)
- Pittsburgh Allegheny Co Airport (18 km)
- Salina 3 W (19 km)
- Natrona Lock 4 (22 km)
- Loyalhanna Lake (24 km)
- Mount Pleasant (29 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.