Port Lions, AK 99550 Frost Dates
99550, near Port Lions, AK: the frost window
Around 05/27 is the usual last spring frost, about 272 days away. Fall's first freeze usually shows up around 09/23, roughly 117 days after the last spring frost.
Port Lions sits in USDA Zone 7a (0 to 5°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
Port Lions's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Port Lions's last frost
05/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/10 and only about 1 year in 10 sees frost after that.
Port Lions against the rest of the dataset
Port Lions's growing season runs about 117 days, ranking 39,264 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 140 of 269.
Learn more
Two guides worth reading on 99550: the frost range, on how to read the range around Port Lions's dates instead of trusting one, and local microclimates, on what one yard in Port Lions can differ from the 99550 normal.