Frost dates for Braddock Lock 2, PA
At Braddock Lock 2, the median last spring frost (32°F) is Apr 5 and the median first fall frost is Nov 10, for a typical growing season of 219 days. For a 90% chance that the last frost has passed, wait until Apr 22. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 5Last spring frost (median)50% chance of 32°F after this date
- Apr 22Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 219 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 3 | Apr 20 | May 11 |
| 32°F | Mar 22 | Apr 5 | Apr 22 |
| 28°F | Mar 12 | Mar 27 | Apr 9 |
| 24°F | Feb 28 | Mar 16 | Mar 30 |
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 13 | Oct 29 | Nov 12 |
| 32°F | Oct 28 | Nov 10 | Nov 27 |
| 28°F | Nov 6 | Nov 23 | Dec 10 |
| 24°F | Nov 14 | Dec 3 | Dec 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 | 165 days | 189 days | 213 days |
| 32°F | 196 days | 219 days | 240 days |
| 28°F | 220 days | 241 days | 263 days |
| 24°F | 238 days | 262 days | 286 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 |
|---|---|---|---|
| 15104 | 6b | -5 to 0°F | 1 km |
| 15110 | 6b | -5 to 0°F | 2 km |
| 15112 | 6b | -5 to 0°F | 2 km |
| 15145 | 6b | -5 to 0°F | 4 km |
| 15120 | 6b | -5 to 0°F | 4 km |
| 15218 | 6b | -5 to 0°F | 4 km |
| 15035 | 6b | -5 to 0°F | 4 km |
| 15137 | 6b | -5 to 0°F | 5 km |
| 15221 | 6b | -5 to 0°F | 5 km |
| 15148 | 6b | -5 to 0°F | 5 km |
| 15217 | 6b | -5 to 0°F | 7 km |
| 15208 | 6b | -5 to 0°F | 8 km |
| 15235 | 6b | -5 to 0°F | 8 km |
| 15232 | 6b | -5 to 0°F | 9 km |
| 15260 | 6b | -5 to 0°F | 10 km |
| 15206 | 6b | -5 to 0°F | 10 km |
| 15224 | 6b | -5 to 0°F | 11 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 USC00360861, at 40.3917, -79.8594, elevation 222 m (730 ft).
- Data quality: Estimated from nearby stations (2+ years), 8 years of freeze data.
- Average days per year at or below 32°F: 92.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- McKeesport (6 km)
- Pittsburgh Allegheny Co Airport (7 km)
- Murrysville 2 SW (12 km)
- Acmetonia Lock 3 (16 km)
- Emsworth L/d Ohio River (23 km)
- Donora 1 SW (25 km)
- Natrona Lock 4 (27 km)
- Charleroi Lock 4 (27 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.