Gustavus, AK 99827 Frost Dates
Gustavus, AK: when does the frost end?
Typically, the last spring freeze lands around 04/25, roughly 240 days out. Fall's first freeze usually shows up around 10/12, roughly 172 days after the last spring frost.
Gustavus sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 6 weeks until Gustavus's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Gustavus against the rest of the dataset
Gustavus's growing season runs about 172 days, ranking 28,432 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 15 of 269.
Learn more
Before leaning on 99827's figures: zone vs. frost date explains why Zone 5b and Gustavus's frost date answer different questions, while the frost range explains how to read the range around Gustavus's dates instead of trusting one.