Effingham, KS 66023 Frost Dates
Frost dates for Effingham, KS, ZIP 66023
Typically, the last spring freeze lands around 04/18, roughly 233 days out. The first fall frost typically arrives around 10/17, about 180 frost-free days later.
The USDA Plant Hardiness Zone Map puts Effingham 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 Effingham 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 Effingham's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Effingham compares
At roughly 180 frost-free days, Effingham places 25,019 of 40,283 ZIP codes in this dataset. Within KS, it ranks 526 of 745.
Learn more
zone vs. frost date explains why Zone 6a and Effingham's frost date answer different questions, and the frost range explains how to read the range around Effingham's dates instead of trusting one.