Princeton, WI 54968 Frost Dates
Frost dates for Princeton, WI, ZIP 54968
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/05, about 153 frost-free days later.
Zone 5a (-20 to -15°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 Princeton, not a forecast for this year.
What to do before the first frost
Zone 5a around Princeton 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.
The actual range around Princeton's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Princeton compares
Princeton's growing season runs about 153 days, ranking 34,563 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 509 of 860.
Learn more
the frost range explains how to read the range around Princeton's dates instead of trusting one, and local microclimates explains what one yard in Princeton can differ from the 54968 normal.