Frost Dates for 66720 — Chanute, Kansas

Half of springs at Chanute Martin Johnson Airport, KS see their last 32°F night by April 10; only one in ten is past it by March 24, and one in ten still has one after April 26. Planting tender crops after April 16 leaves a 30% risk of a frost on them, after April 21 20%, and after April 26 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 76% of the 110 Kansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 28 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 8 days later, around November 5; in spring the one-in-ten date for 28°F is April 16, 10 days before the 32°F one. The freeze-free season lasts 199 days in a typical year, longer than at 79% of the 110 Kansas stations; it reaches 222 days one year in ten and falls short of 179 one year in ten. On average 102 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 11 days longer, to about April 21, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 6 and February 27.

July is the warmest month at Chanute Martin Johnson Airport, KS, averaging 92°F by day and 70°F at night; January is the coldest at 44°F and 23°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 74% of years.

Warmth for growing adds up to 4,628 growing degree days a year (base 50°F), more than at 97% of the 110 Kansas stations. 37% of them (1,715) have built up by the end of June, and July adds the most, 949. Precipitation totals 40.8 inches a year, most in May (5.9") and least in January (1.2"); May to September bring 58% of it.

The nearest other station, Humboldt, KS, 10 miles north of Chanute, has a last frost 1 day later (April 11), a first frost 1 day earlier (October 27), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Chanute usually arrives around December 18, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Chanute 4E, KS, 4.3 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 54 days after the last snow.

ZIP 66720 is 2 miles from Chanute Martin Johnson Airport, KS, which stands at 985 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 66720 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.