Frost dates for Marcus Hook, PA
At Marcus Hook, the median last spring frost (32°F) is Mar 30 and the median first fall frost is Nov 16, for a typical growing season of 230 days. For a 90% chance that the last frost has passed, wait until Apr 9. Nearby ZIP codes are in USDA hardiness zones 7a to 8a.
- Mar 30Last spring frost (median)50% chance of 32°F after this date
- Apr 9Safer planting date10% chance of 32°F after this date
- Nov 16First fall frost (median)50% chance of 32°F by this date
- 230 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 | Mar 30 | Apr 9 | Apr 22 |
| 32°F | Mar 16 | Mar 30 | Apr 9 |
| 28°F | Mar 4 | Mar 20 | Mar 31 |
| 24°F | Feb 22 | Mar 11 | Mar 25 |
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 21 | Nov 2 | Nov 17 |
| 32°F | Nov 2 | Nov 16 | Dec 2 |
| 28°F | Nov 11 | Nov 28 | Dec 15 |
| 24°F | Nov 20 | Dec 11 | Jan 1 |
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 | 187 days | 206 days | 224 days |
| 32°F | 212 days | 230 days | 253 days |
| 28°F | 231 days | 252 days | 275 days |
| 24°F | 251 days | 276 days | 301 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 |
|---|---|---|---|
| 19061 | 7b | 5 to 10°F | 0 km |
| 19703 | 7b | 5 to 10°F | 3 km |
| 19014 | 7b | 5 to 10°F | 4 km |
| 19013 | 7b | 5 to 10°F | 5 km |
| 08014 | 8a | 10 to 15°F | 5 km |
| 19015 | 7b | 5 to 10°F | 6 km |
| 19060 | 7b | 5 to 10°F | 6 km |
| 19017 | 7b | 5 to 10°F | 8 km |
| 19052 | 7b | 5 to 10°F | 8 km |
| 19022 | 8a | 10 to 15°F | 9 km |
| 19086 | 7b | 5 to 10°F | 9 km |
| 19094 | 7b | 5 to 10°F | 9 km |
| 08067 | 7b | 5 to 10°F | 10 km |
| 19063 | 7b | 5 to 10°F | 11 km |
| 19342 | 7a | 0 to 5°F | 11 km |
| 08085 | 7b | 5 to 10°F | 12 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 USC00365390, at 39.8253, -75.4283, elevation 3 m (10 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 64.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Philadelphia Intl Airport (18 km)
- W Chester 2 NW (24 km)
- Phila Franklin Inst (26 km)
- Avondale 2 N (31 km)
- Norristown (33 km)
- Phoenixville 1 E (33 km)
- Glenmoore (41 km)
- Coatesville 2 W (41 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.