Marine on St. Croix, MN 55047 Frost Dates
When can you plant in Marine on St. Croix, MN?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. The first fall frost typically arrives around 10/05, about 154 frost-free days later.
Marine on St. Croix sits in USDA Zone 4b (-25 to -20°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
About 5 weeks of growing season left in Marine on St. Croix 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
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marine on St. Croix compares
Marine on St. Croix's growing season runs about 154 days, ranking 34,396 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 393 of 943.
Learn more
zone vs. frost date covers why Zone 4b and Marine on St. Croix's frost date answer different questions. the frost range covers how to read the range around Marine on St. Croix's dates instead of trusting one.