Wyoming, IL 61491 Frost Dates
When can you plant in Wyoming, IL?
The last spring frost here typically falls around 04/22, about 237 days from today. The first fall frost typically arrives around 10/14, about 174 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 Wyoming, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Wyoming before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Wyoming's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wyoming compares
Wyoming's growing season runs about 174 days, ranking 27,543 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,254 of 1,548.
Learn more
local microclimates covers what one yard in Wyoming can differ from the 61491 normal. zone vs. frost date covers why Zone 5b and Wyoming's frost date answer different questions.