Valdez, AK 99566 Frost Dates
99566, near Valdez, AK: the frost window
The last spring frost here typically falls around 05/31, about 276 days from today. Fall's first freeze usually shows up around 09/03, roughly 95 days after the last spring frost.
Zone 4b (-25 to -20°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 Valdez, not a forecast for this year.
Stretching the season past the first frost
Valdez's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Valdez's last frost
05/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/20 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.
Valdez against the rest of the dataset
About 95 days separate Valdez's last and first frost, putting it 39,809 of 40,283 ZIP codes nationally. Within AK, it ranks 207 of 269.
Learn more
Two guides worth reading on 99566: zone vs. frost date, on why Zone 4b and Valdez's frost date answer different questions, and the frost range, on how to read the range around Valdez's dates instead of trusting one.