Frost Dates for 66508 — Marysville, Kansas

Half of springs at Marysville, KS see their last 32°F night by April 25; only one in ten is past it by April 10, and one in ten still has one after May 9. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 3 20%, and after May 9 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 13 in half of years, as early as September 28 one year in ten, and holds off past October 26 one year in ten. A hard freeze of 28°F follows 9 days later, around October 22; in spring the one-in-ten date for 28°F is April 30, 9 days before the 32°F one. The freeze-free season lasts 171 days in a typical year, shorter than at 90% of the 110 Kansas stations; it reaches 191 days one year in ten and falls short of 150 one year in ten. On average 135 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 8 days longer, to about May 3, and return around October 3. Severe cold of 16°F or below comes every winter, usually between November 21 and March 13.

July is the warmest month at Marysville, KS, averaging 90°F by day and 67°F at night; January is the coldest at 38°F and 15°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 28% of years.

Warmth for growing adds up to 3,897 growing degree days a year (base 50°F), fewer than at 76% of the 110 Kansas stations. 36% of them (1,386) have built up by the end of June, and July adds the most, 883. Precipitation totals 33.7 inches a year, most in May (4.9") and least in January (0.8"); May to September bring 64% of it.

The nearest other station, Baileyville, KS, 24 miles east of Marysville, has a last frost 3 days earlier (April 22), the same first-frost date, a season 2 days longer.

The first measurable snow (0.1 inch or more) in Marysville usually arrives around December 16, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Marysville, KS, 1 miles away: half of years saw snow earlier, half later. Snow fell in 90% of those winters. The last 32°F night of spring typically comes 40 days after the last snow.

ZIP 66508 is 1 mile from Marysville, KS, which stands at 1,178 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 66508 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.