Plymouth, IN 46513 Frost Dates
Frost dates for Plymouth, IN, ZIP 46513
Typically, the last spring freeze lands around 04/26, roughly 241 days out. The first fall frost typically arrives around 10/19, about 174 frost-free days later.
The USDA Plant Hardiness Zone Map puts Plymouth in Zone 6a (-10 to -5°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 6a around Plymouth has about 7 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 Plymouth's last frost
04/26 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 Plymouth compares
At roughly 174 frost-free days, Plymouth places 27,404 of 40,283 ZIP codes in this dataset. Within IN, it ranks 657 of 927.
Learn more
zone vs. frost date explains why Zone 6a and Plymouth's frost date answer different questions, and the frost range explains how to read the range around Plymouth's dates instead of trusting one.