Frost dates for Lebanon 2 W, PA
At Lebanon 2 W, the median last spring frost (32°F) is Apr 20 and the median first fall frost is Oct 25, for a typical growing season of 185 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 20Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 185 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 18 | May 2 | May 18 |
| 32°F | Apr 5 | Apr 20 | May 7 |
| 28°F | Mar 22 | Apr 4 | Apr 18 |
| 24°F | Mar 6 | Mar 23 | Apr 5 |
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 14 | Oct 28 |
| 32°F | Oct 10 | Oct 25 | Nov 6 |
| 28°F | Oct 22 | Nov 5 | Nov 20 |
| 24°F | Nov 3 | Nov 17 | Dec 4 |
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 | 144 days | 164 days | 183 days |
| 32°F | 166 days | 185 days | 206 days |
| 28°F | 192 days | 212 days | 234 days |
| 24°F | 219 days | 240 days | 262 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 |
|---|---|---|---|
| 17042 | 7a | 0 to 5°F | 6 km |
| 17046 | 7a | 0 to 5°F | 6 km |
| 17003 | 7a | 0 to 5°F | 8 km |
| 17016 | 7a | 0 to 5°F | 8 km |
| 17064 | 7a | 0 to 5°F | 10 km |
| 17078 | 7a | 0 to 5°F | 11 km |
| 17010 | 7a | 0 to 5°F | 12 km |
| 17067 | 7a | 0 to 5°F | 14 km |
| 17041 | 7a | 0 to 5°F | 14 km |
| 17088 | 7a | 0 to 5°F | 15 km |
| 17026 | 7a | 0 to 5°F | 16 km |
| 17038 | 7a | 0 to 5°F | 16 km |
| 19544 | 7a | 0 to 5°F | 17 km |
| 17073 | 7a | 0 to 5°F | 18 km |
| 17087 | 7a | 0 to 5°F | 19 km |
| 17039 | 7a | 0 to 5°F | 20 km |
| 17963 | 7a | 0 to 5°F | 26 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 USC00364896, at 40.3333, -76.4667, elevation 137 m (450 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 120.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Landisville 2 NW (24 km)
- Dehart Dam (28 km)
- Lancaster Airport (28 km)
- Middletown Harrisburg Intl Airport (30 km)
- Harrisburg 1 NE (35 km)
- Harrisburg Cptl Cy Airport (35 km)
- Lancaster 2ne Fltr Plant (35 km)
- Blue Marsh Lake (38 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.