Frost dates for Grampian 1e, PA
At Grampian 1e, the median last spring frost (32°F) is May 4 and the median first fall frost is Oct 13, for a typical growing season of 160 days. For a 90% chance that the last frost has passed, wait until May 21. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 4Last spring frost (median)50% chance of 32°F after this date
- May 21Safer planting date10% chance of 32°F after this date
- Oct 13First 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 16 | May 30 |
| 32°F | Apr 20 | May 4 | May 21 |
| 28°F | Apr 6 | Apr 23 | May 10 |
| 24°F | Mar 26 | Apr 8 | Apr 24 |
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 12 |
| 32°F | Sep 30 | Oct 13 | Oct 28 |
| 28°F | Oct 11 | Oct 27 | Nov 10 |
| 24°F | Oct 25 | Nov 9 | Nov 23 |
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 | 117 days | 137 days | 159 days |
| 32°F | 138 days | 160 days | 182 days |
| 28°F | 164 days | 184 days | 205 days |
| 24°F | 190 days | 212 days | 233 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 |
|---|---|---|---|
| 16833 | 6a | -10 to -5°F | 3 km |
| 16838 | 6a | -10 to -5°F | 7 km |
| 16837 | 6a | -10 to -5°F | 10 km |
| 16863 | 6a | -10 to -5°F | 11 km |
| 16861 | 6a | -10 to -5°F | 12 km |
| 15848 | 6a | -10 to -5°F | 13 km |
| 15856 | 6a | -10 to -5°F | 13 km |
| 15757 | 6a | -10 to -5°F | 14 km |
| 15866 | 6a | -10 to -5°F | 18 km |
| 16661 | 6a | -10 to -5°F | 18 km |
| 15721 | 6a | -10 to -5°F | 23 km |
| 15772 | 6a | -10 to -5°F | 28 km |
| 15712 | 6a | -10 to -5°F | 29 km |
| 15742 | 6a | -10 to -5°F | 29 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 USC00363417, at 40.9667, -78.5872, elevation 460 m (1,510 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 156.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Clearfield Lawrence Airport (17 km)
- Philipsburg 2 S (33 km)
- Dubois Jefferson Co Airport (35 km)
- Prince Gallitzin State Park (35 km)
- Ridgway (52 km)
- Altoona 3 W (53 km)
- Clarence (55 km)
- Ebensburg Sewage Plant (57 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.