Frost dates for Chambersburg 1 ESE, PA
At Chambersburg 1 ESE, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 25, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 188 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 | Apr 30 | May 17 |
| 32°F | Apr 3 | Apr 18 | May 5 |
| 28°F | Mar 21 | Apr 4 | Apr 21 |
| 24°F | Mar 7 | Mar 24 | Apr 6 |
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 1 | Oct 14 | Oct 28 |
| 32°F | Oct 10 | Oct 25 | Nov 8 |
| 28°F | Oct 23 | Nov 6 | Nov 21 |
| 24°F | Nov 2 | Nov 18 | Dec 5 |
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 | 143 days | 165 days | 185 days |
| 32°F | 165 days | 188 days | 208 days |
| 28°F | 191 days | 213 days | 234 days |
| 24°F | 217 days | 238 days | 262 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 |
|---|---|---|---|
| 17201 | 7a | 0 to 5°F | 3 km |
| 17202 | 7a | 0 to 5°F | 5 km |
| 17254 | 7a | 0 to 5°F | 6 km |
| 17235 | 7a | 0 to 5°F | 10 km |
| 17265 | 7a | 0 to 5°F | 16 km |
| 17252 | 7a | 0 to 5°F | 16 km |
| 17221 | 7a | 0 to 5°F | 20 km |
| 17224 | 7a | 0 to 5°F | 21 km |
| 17271 | 7a | 0 to 5°F | 23 km |
| 17215 | 7a | 0 to 5°F | 26 km |
| 17223 | 7a | 0 to 5°F | 30 km |
| 17233 | 7a | 0 to 5°F | 30 km |
| 17255 | 7a | 0 to 5°F | 31 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 USC00361354, at 39.9353, -77.6394, elevation 195 m (640 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 109.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- S Mountain (15 km)
- Shippensburg (17 km)
- Cashtown 1s (25 km)
- Biglerville (33 km)
- Eisenhower Nhs (38 km)
- Bloserville 1 N (43 km)
- Carlisle Water Plant (50 km)
- Hanover 4 SW (55 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.