Frost dates for Dubois Jefferson Co Airport, PA
At Dubois Jefferson Co Airport, the median last spring frost (32°F) is May 6 and the median first fall frost is Oct 14, for a typical growing season of 160 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 6Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 160 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 30 | May 18 | Jun 1 |
| 32°F | Apr 19 | May 6 | May 23 |
| 28°F | Apr 8 | Apr 24 | May 13 |
| 24°F | Mar 27 | Apr 10 | Apr 30 |
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 19 | Oct 1 | Oct 13 |
| 32°F | Sep 29 | Oct 14 | Nov 1 |
| 28°F | Oct 11 | Oct 28 | Nov 11 |
| 24°F | Oct 27 | Nov 9 | Nov 25 |
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 | 116 days | 137 days | 158 days |
| 32°F | 139 days | 160 days | 183 days |
| 28°F | 162 days | 186 days | 208 days |
| 24°F | 190 days | 213 days | 236 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 |
|---|---|---|---|
| 15840 | 6a | -10 to -5°F | 6 km |
| 15851 | 6a | -10 to -5°F | 8 km |
| 15824 | 6a | -10 to -5°F | 9 km |
| 15825 | 6a | -10 to -5°F | 12 km |
| 15801 | 6a | -10 to -5°F | 15 km |
| 15865 | 6a | -10 to -5°F | 16 km |
| 15823 | 6a | -10 to -5°F | 18 km |
| 15711 | 6a | -10 to -5°F | 18 km |
| 15863 | 6a | -10 to -5°F | 19 km |
| 15733 | 6a | -10 to -5°F | 22 km |
| 15715 | 6a | -10 to -5°F | 23 km |
| 15767 | 6a | -10 to -5°F | 25 km |
| 15781 | 6a | -10 to -5°F | 25 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 USW00004787, at 41.1783, -78.8989, elevation 553 m (1,814 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 138.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ridgway (30 km)
- Cooksburg 2 NW (33 km)
- Grampian 1e (35 km)
- Putneyville 2 SE Dam (43 km)
- Clearfield Lawrence Airport (43 km)
- Clarion 3 SW (45 km)
- Glen Hazel 2 NE Dam (49 km)
- Kane 1nne (56 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.