Frost Dates for 67449 — Herington, Kansas

Half of springs at Herington, KS see their last 32°F night by April 24; only one in ten is past it by April 9, and one in ten still has one after May 8. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 4 20%, and after May 8 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 44% of the 110 Kansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 14 in half of years, as early as September 29 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 10 days later, around October 24; in spring the one-in-ten date for 28°F is May 1, 7 days before the 32°F one. The freeze-free season lasts 173 days in a typical year, shorter than at 85% of the 110 Kansas stations; it reaches 194 days one year in ten and falls short of 151 one year in ten. On average 129 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 9 days longer, to about May 3, and return around October 5. Severe cold of 16°F or below comes every winter, usually between November 21 and March 11.

July is the warmest month at Herington, KS, averaging 90°F by day and 67°F at night; January is the coldest at 40°F and 17°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 29% of years.

Warmth for growing adds up to 3,928 growing degree days a year (base 50°F), fewer than at 73% of the 110 Kansas stations. 35% of them (1,383) have built up by the end of June, and July adds the most, 888. Precipitation totals 34.3 inches a year, most in May (5.1") and least in January (0.8"); May to September bring 62% of it.

The nearest other station, Council Grove Lake, KS, 22 miles east of Herington, has a last frost 13 days earlier (April 11), a first frost 11 days later (October 25), a season 21 days longer.

The first measurable snow (0.1 inch or more) in Herington usually arrives around December 9, and the last of the season around March 4. Those are the middle dates across the winters of 1991–2020 at Herington, KS, 1.7 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 51 days after the last snow.

ZIP 67449 is 2 miles from Herington, KS, which stands at 1,338 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 67449 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.