Kupreanof, AK 99833 Frost Dates
Kupreanof, AK: when does the frost end?
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/17, roughly 169 days after the last spring frost.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Kupreanof, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Kupreanof's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Kupreanof against the rest of the dataset
At roughly 169 frost-free days, Kupreanof places 29,641 of 40,283 ZIP codes in this dataset. Within AK, it ranks 18 of 269.
Learn more
Before leaning on 99833's figures: zone vs. frost date explains why Zone 7b and Kupreanof's frost date answer different questions, while the frost range explains how to read the range around Kupreanof's dates instead of trusting one.