Frost dates for Franklin, PA
At Franklin, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 23, for a typical growing season of 171 days. For a 90% chance that the last frost has passed, wait until May 20. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 20Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 171 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 29 | May 13 | May 28 |
| 32°F | Apr 20 | May 2 | May 20 |
| 28°F | Apr 7 | Apr 21 | May 8 |
| 24°F | Mar 25 | Apr 7 | Apr 21 |
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 9 | Oct 23 |
| 32°F | Oct 8 | Oct 23 | Nov 4 |
| 28°F | Oct 22 | Nov 3 | Nov 15 |
| 24°F | Nov 2 | Nov 14 | 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 | 130 days | 149 days | 170 days |
| 32°F | 153 days | 171 days | 190 days |
| 28°F | 175 days | 195 days | 214 days |
| 24°F | 201 days | 220 days | 240 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 |
|---|---|---|---|
| 16323 | 6a | -10 to -5°F | 2 km |
| 16343 | 6a | -10 to -5°F | 7 km |
| 16342 | 6a | -10 to -5°F | 13 km |
| 16362 | 6a | -10 to -5°F | 13 km |
| 16346 | 6a | -10 to -5°F | 13 km |
| 16344 | 6a | -10 to -5°F | 15 km |
| 16317 | 6a | -10 to -5°F | 15 km |
| 16374 | 6a | -10 to -5°F | 15 km |
| 16311 | 6a | -10 to -5°F | 19 km |
| 16319 | 6a | -10 to -5°F | 19 km |
| 16145 | 6a | -10 to -5°F | 21 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 USC00363028, at 41.4003, -79.8306, elevation 309 m (1,015 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 142.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Titusville Wtr Wks (28 km)
- Tionesta 2 SE Lake (33 km)
- Mercer (39 km)
- Clarion 3 SW (40 km)
- Port Meadville Airport (41 km)
- Slippery Rock 1 SSW (43 km)
- Cooksburg 2 NW (51 km)
- Jamestown 2 NW (54 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.