Auburn, ME 04221 Frost Dates
Frost dates for Auburn, ME, ZIP 04221
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/03, about 148 frost-free days later.
Auburn sits in USDA Zone 5a (-20 to -15°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.
What to do before the first frost
Zone 5a around Auburn has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Auburn compares
Auburn's growing season runs about 148 days, ranking 35,649 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 303 of 456.
Learn more
the frost range explains how to read the range around Auburn's dates instead of trusting one, and local microclimates explains what one yard in Auburn can differ from the 04221 normal.