Delta Junction, AK 99737 Frost Dates
When can you plant in Delta Junction, AK?
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 09/07, about 113 frost-free days later.
Zone 3a (-40 to -35°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 Delta Junction, not a forecast for this year.
What to do before the first frost
About 1 week of growing season left in Delta Junction before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Delta Junction compares
At roughly 113 frost-free days, Delta Junction places 39,399 of 40,283 ZIP codes in this dataset. Within AK, it ranks 148 of 269.
Learn more
zone vs. frost date covers why Zone 3a and Delta Junction's frost date answer different questions. the frost range covers how to read the range around Delta Junction's dates instead of trusting one.