Silver Bay, MN 55603 Frost Dates
When can you plant in Silver Bay, MN?
The last spring frost here typically falls around 05/15, about 260 days from today. The first fall frost typically arrives around 10/01, about 137 frost-free days later.
Zone 4a (-30 to -25°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 Silver Bay, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Silver Bay before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Silver Bay's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 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 Silver Bay compares
About 137 days separate Silver Bay's last and first frost, putting it 37,520 of 40,283 ZIP codes nationally. Within MN, it ranks 778 of 943.
Learn more
zone vs. frost date covers why Zone 4a and Silver Bay's frost date answer different questions. the frost range covers how to read the range around Silver Bay's dates instead of trusting one.