Olathe, CO 81425 Frost Dates
Olathe, CO: when does the frost end?
The last spring frost here typically falls around 05/02, about 247 days from today. Fall's first freeze usually shows up around 10/08, roughly 157 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Olathe in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 6 weeks until Olathe's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Olathe against the rest of the dataset
Olathe's growing season runs about 157 days, ranking 33,339 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 179 of 624.
Learn more
Before leaning on 81425's figures: local microclimates explains what one yard in Olathe can differ from the 81425 normal, while zone vs. frost date explains why Zone 6b and Olathe's frost date answer different questions.