Leavenworth, KS 66027 Frost Dates
Frost dates for Leavenworth, KS, ZIP 66027
The last spring frost here typically falls around 04/19, about 234 days from today. The first fall frost typically arrives around 10/19, about 181 frost-free days later.
Zone 6b (-5 to 0°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 Leavenworth, not a forecast for this year.
What to do before the first frost
Zone 6b around Leavenworth 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.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Leavenworth compares
At roughly 181 frost-free days, Leavenworth places 24,440 of 40,283 ZIP codes in this dataset. Within KS, it ranks 483 of 745.
Learn more
local microclimates explains what one yard in Leavenworth can differ from the 66027 normal, and zone vs. frost date explains why Zone 6b and Leavenworth's frost date answer different questions.