Frost dates for Washington 3 NE, PA
At Washington 3 NE, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 23, for a typical growing season of 181 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 181 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 6b (-5 to 0°F) · see all zone 6b frost dates
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 6 | May 25 |
| 32°F | Apr 8 | Apr 24 | May 18 |
| 28°F | Mar 29 | Apr 11 | May 4 |
| 24°F | Mar 16 | Apr 1 | Apr 16 |
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 29 | Oct 11 | Oct 25 |
| 32°F | Oct 8 | Oct 23 | Nov 5 |
| 28°F | Oct 19 | Nov 2 | Nov 16 |
| 24°F | Nov 1 | Nov 14 | Dec 2 |
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 | 135 days | 158 days | 180 days |
| 32°F | 158 days | 181 days | 203 days |
| 28°F | 179 days | 206 days | 227 days |
| 24°F | 206 days | 228 days | 253 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 |
|---|---|---|---|
| 15347 | 6b | -5 to 0°F | 5 km |
| 15301 | 6b | -5 to 0°F | 6 km |
| 15342 | 6b | -5 to 0°F | 8 km |
| 15363 | 6b | -5 to 0°F | 8 km |
| 15330 | 6b | -5 to 0°F | 8 km |
| 15317 | 6b | -5 to 0°F | 11 km |
| 15350 | 6b | -5 to 0°F | 13 km |
| 15360 | 6b | -5 to 0°F | 14 km |
| 15324 | 6b | -5 to 0°F | 14 km |
| 15367 | 6b | -5 to 0°F | 15 km |
| 15311 | 6b | -5 to 0°F | 15 km |
| 15055 | 6b | -5 to 0°F | 15 km |
| 15321 | 6b | -5 to 0°F | 16 km |
| 15340 | 6b | -5 to 0°F | 16 km |
| 15365 | 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 USC00369318, at 40.1789, -80.1889, elevation 396 m (1,300 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 122.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Charleroi Lock 4 (25 km)
- Donora 1 SW (27 km)
- Pittsburgh Allegheny Co Airport (30 km)
- Waynesburg 1 E (31 km)
- McKeesport (33 km)
- Pittsburgh Intl Airport (34 km)
- Braddock Lock 2 (37 km)
- Emsworth L/d Ohio River (37 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.