Frost dates for Raystown HQ, PA
At Raystown HQ, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 29, for a typical growing season of 194 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 194 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 16 | May 2 | May 19 |
| 32°F | Apr 4 | Apr 19 | May 8 |
| 28°F | Mar 23 | Apr 5 | Apr 21 |
| 24°F | Mar 12 | Mar 28 | Apr 8 |
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 | Oct 4 | Oct 17 | Oct 30 |
| 32°F | Oct 13 | Oct 29 | Nov 11 |
| 28°F | Oct 27 | Nov 9 | Nov 25 |
| 24°F | Nov 5 | Nov 20 | Dec 8 |
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 | 149 days | 168 days | 189 days |
| 32°F | 169 days | 194 days | 213 days |
| 28°F | 199 days | 217 days | 235 days |
| 24°F | 220 days | 240 days | 259 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 16647 | 7a | 0 to 5°F | 3 km |
| 16622 | 6b | -5 to 0°F | 6 km |
| 16657 | 6b | -5 to 0°F | 9 km |
| 16685 | 6b | -5 to 0°F | 11 km |
| 16638 | 6b | -5 to 0°F | 12 km |
| 16623 | 6b | -5 to 0°F | 12 km |
| 16654 | 7a | 0 to 5°F | 13 km |
| 17052 | 6b | -5 to 0°F | 14 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 USC00367313, at 40.3814, -78.0753, elevation 303 m (995 ft).
- Data quality: Estimated from nearby stations (2+ years), 8 years of freeze data.
- Average days per year at or below 32°F: 119.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Raystown Lake 2 (0 km)
- Altoona Blair Co Airport (23 km)
- Altoona 7 SW (29 km)
- Altoona 3 W (35 km)
- Everett (48 km)
- Lewistown (48 km)
- State College (49 km)
- Prince Gallitzin State Park (50 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.