Omro, WI 54963 Frost Dates
When can you plant in Omro, WI?
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/08, about 158 frost-free days later.
Zone 5b (-15 to -10°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 Omro, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Omro 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
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Omro compares
Omro's growing season runs about 158 days, ranking 32,983 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 365 of 860.
Learn more
local microclimates covers what one yard in Omro can differ from the 54963 normal. zone vs. frost date covers why Zone 5b and Omro's frost date answer different questions.