Frost dates in Kupreanof, AK
The average last spring frost in Kupreanof is around May 10 and the first fall frost is around October 6. That gives Kupreanof an average growing season of about 149 days.
Last spring frost
| Early (10% chance after) | April 20 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 30 |
First fall frost
| Early (10%) | September 16 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | November 1 |