Frost dates for Clarence, PA
At Clarence, the median last spring frost (32°F) is May 21 and the median first fall frost is Sep 27, for a typical growing season of 130 days. For a 90% chance that the last frost has passed, wait until Jun 1. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 21Last spring frost (median)50% chance of 32°F after this date
- Jun 1Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 130 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 15 | May 31 | Jun 15 |
| 32°F | Apr 30 | May 21 | Jun 1 |
| 28°F | Apr 21 | May 7 | May 27 |
| 24°F | Apr 7 | Apr 25 | May 16 |
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 | Aug 31 | Sep 15 | Oct 1 |
| 32°F | Sep 12 | Sep 27 | Oct 13 |
| 28°F | Sep 22 | Oct 8 | Oct 30 |
| 24°F | Oct 3 | Oct 24 | Nov 9 |
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 | 83 days | 106 days | 130 days |
| 32°F | 109 days | 130 days | 154 days |
| 28°F | 128 days | 153 days | 179 days |
| 24°F | 152 days | 181 days | 207 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 |
|---|---|---|---|
| 16829 | 6a | -10 to -5°F | 6 km |
| 16874 | 6a | -10 to -5°F | 7 km |
| 16845 | 6a | -10 to -5°F | 7 km |
| 16859 | 6a | -10 to -5°F | 8 km |
| 16834 | 6a | -10 to -5°F | 12 km |
| 16839 | 6a | -10 to -5°F | 15 km |
| 16864 | 6b | -5 to 0°F | 17 km |
| 16871 | 6a | -10 to -5°F | 18 km |
| 16841 | 6b | -5 to 0°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 USC00361480, at 41.0489, -77.9411, elevation 424 m (1,390 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 175.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- State College (29 km)
- Philipsburg 2 S (30 km)
- Alvin R Bush Dam (34 km)
- Renovo (36 km)
- Clearfield Lawrence Airport (39 km)
- Stevenson Dam (40 km)
- Millheim (43 km)
- Lock Haven Sewage Plant (44 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.