Frost dates in Petersburg Borough, Alaska
The average last spring frost in Petersburg Borough falls Apr 29 and the average first fall frost Oct 17, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 7b. Places: Petersburg. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 99833 | Petersburg | Apr 29 | Oct 17 | 7b |
Nearby counties
Sitka City and Borough Prince of Wales-Hyder Census Area Wrangell City and Borough Ketchikan Gateway Borough Juneau City and Borough Hoonah-Angoon Census Area
All Alaska counties · Download Alaska frost dates (CSV)
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