St. Johns, MI 48833 Frost Dates
Frost dates for St. Johns, MI, ZIP 48833
The last spring frost here typically falls around 04/28, about 243 days from today. The first fall frost typically arrives around 10/24, about 179 frost-free days later.
St. Johns sits in USDA Zone 6a (-10 to -5°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 6a around St. Johns has about 8 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.
The actual range around St. Johns's last frost
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Johns compares
St. Johns's growing season runs about 179 days, ranking 25,264 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 93 of 1,153.
Learn more
local microclimates explains what one yard in St. Johns can differ from the 48833 normal, and zone vs. frost date explains why Zone 6a and St. Johns's frost date answer different questions.