Kupreanof, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kupreanof, a city in Petersburg Borough County, Alaska.
Overnight
52°F
Partly Cloudy
Partly cloudy, with a low around 52. Northwest wind around 5 mph.
7-day forecast for Kupreanof
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Partly Cloudy | 5 mph NW | 1% |
| Tuesday | 63°F | Mostly Sunny | 5 to 10 mph NW | 1% |
| Tuesday Night | 52°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Wednesday | 65°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NW | 3% |
| Thursday Night | 53°F | Mostly Cloudy | 0 to 5 mph NW | 9% |
| Friday | 65°F | Mostly Cloudy | 0 mph | 12% |
| Friday Night | 54°F | Slight Chance Rain Showers | 0 mph | 18% |
| Saturday | 64°F | Slight Chance Rain Showers | 0 to 5 mph NW | 20% |
| Saturday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph NW | 20% |
| Sunday | 65°F | Partly Sunny | 0 to 5 mph NW | 0% |
| Sunday Night | 53°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Monday | 66°F | Partly Sunny | 0 to 5 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov) for Kupreanof (56.821, -132.972). Updated through the day.
Growing snapshot for Kupreanof
Last spring frost
Apr 29
First fall frost
Oct 17
Growing season
169 days
More local growing data for Kupreanof: nearby ZIP 99833 weather · frost dates · planting calendar · Alaska frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Petersburg 1, Ak (9.7 mi from Kupreanof). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.