Frost dates for York 3 SSW Pump Station, PA
At York 3 SSW Pump Station, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 19, for a typical growing season of 177 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 177 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 23 | May 8 | May 24 |
| 32°F | Apr 7 | Apr 26 | May 13 |
| 28°F | Mar 24 | Apr 8 | Apr 26 |
| 24°F | Mar 11 | Mar 27 | 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 | Sep 25 | Oct 8 | Oct 22 |
| 32°F | Oct 5 | Oct 19 | Nov 1 |
| 28°F | Oct 15 | Oct 31 | Nov 13 |
| 24°F | Oct 27 | Nov 10 | Nov 29 |
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 | 133 days | 153 days | 175 days |
| 32°F | 155 days | 177 days | 200 days |
| 28°F | 182 days | 203 days | 225 days |
| 24°F | 207 days | 227 days | 249 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 |
|---|---|---|---|
| 17403 | 7a | 0 to 5°F | 3 km |
| 17408 | 7a | 0 to 5°F | 5 km |
| 17407 | 7a | 0 to 5°F | 5 km |
| 17401 | 7a | 0 to 5°F | 5 km |
| 17360 | 7a | 0 to 5°F | 7 km |
| 17342 | 7a | 0 to 5°F | 8 km |
| 17313 | 7a | 0 to 5°F | 9 km |
| 17402 | 7a | 0 to 5°F | 9 km |
| 17404 | 7a | 0 to 5°F | 10 km |
| 17318 | 7a | 0 to 5°F | 12 km |
| 17406 | 7a | 0 to 5°F | 14 km |
| 17356 | 7a | 0 to 5°F | 14 km |
| 17347 | 7a | 0 to 5°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 USC00369933, at 39.9167, -76.7500, elevation 119 m (390 ft).
- Data quality: Representative (10+ years), 21 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
- York Airport (11 km)
- Hanover 4 SW (29 km)
- Safe Harbor Dam (31 km)
- Middletown Harrisburg Intl Airport (31 km)
- Harrisburg Cptl Cy Airport (35 km)
- Landisville 2 NW (36 km)
- Harrisburg 1 NE (42 km)
- Eisenhower Nhs (43 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.