Tustin, MI 49688 Frost Dates
Frost dates for Tustin, MI, ZIP 49688
Typically, the last spring freeze lands around 05/15, roughly 260 days out. The first fall frost typically arrives around 10/01, about 139 frost-free days later.
The USDA Plant Hardiness Zone Map puts Tustin in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5a around Tustin 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
05/15 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. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tustin compares
About 139 days separate Tustin's last and first frost, putting it 37,281 of 40,283 ZIP codes nationally. Within MI, it ranks 919 of 1,153.
Learn more
local microclimates explains what one yard in Tustin can differ from the 49688 normal, and zone vs. frost date explains why Zone 5a and Tustin's frost date answer different questions.