Frost dates for Clarion 3 SW, PA
At Clarion 3 SW, the median last spring frost (32°F) is May 9 and the median first fall frost is Oct 11, for a typical growing season of 154 days. For a 90% chance that the last frost has passed, wait until May 24. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 9Last spring frost (median)50% chance of 32°F after this date
- May 24Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 154 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 | May 4 | May 20 | Jun 2 |
| 32°F | Apr 24 | May 9 | May 24 |
| 28°F | Apr 14 | Apr 29 | May 15 |
| 24°F | Mar 31 | Apr 15 | May 2 |
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 20 | Oct 2 | Oct 14 |
| 32°F | Sep 30 | Oct 11 | Oct 26 |
| 28°F | Oct 8 | Oct 24 | Nov 7 |
| 24°F | Oct 22 | Nov 5 | Nov 19 |
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 | 114 days | 134 days | 153 days |
| 32°F | 135 days | 154 days | 174 days |
| 28°F | 157 days | 178 days | 197 days |
| 24°F | 179 days | 202 days | 223 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 |
|---|---|---|---|
| 16214 | 6a | -10 to -5°F | 7 km |
| 16254 | 6a | -10 to -5°F | 7 km |
| 16255 | 6a | -10 to -5°F | 8 km |
| 16232 | 6a | -10 to -5°F | 10 km |
| 16334 | 6a | -10 to -5°F | 13 km |
| 16213 | 6a | -10 to -5°F | 13 km |
| 16258 | 6a | -10 to -5°F | 14 km |
| 16331 | 6a | -10 to -5°F | 15 km |
| 15829 | 6a | -10 to -5°F | 16 km |
| 16248 | 6a | -10 to -5°F | 18 km |
| 16054 | 6a | -10 to -5°F | 19 km |
| 16036 | 6a | -10 to -5°F | 21 km |
| 16373 | 6a | -10 to -5°F | 22 km |
| 16049 | 6a | -10 to -5°F | 23 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 USC00361485, at 41.1922, -79.4361, elevation 317 m (1,040 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 155.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cooksburg 2 NW (26 km)
- Tionesta 2 SE Lake (32 km)
- Putneyville 2 SE Dam (32 km)
- Franklin (40 km)
- Dubois Jefferson Co Airport (45 km)
- Titusville Wtr Wks (53 km)
- Ford City 4 S Dam (53 km)
- Slippery Rock 1 SSW (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.