Frost Dates for 66076 — Pomona, Kansas

Half of springs at Pomona Lake, KS see their last 32°F night by April 8; only one in ten is past it by March 23, and one in ten still has one after April 22. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 18 20%, and after April 22 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 31 in half of years, as early as October 18 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 8 days later, around November 8; in spring the one-in-ten date for 28°F is April 12, 10 days before the 32°F one. The freeze-free season lasts 205 days in a typical year, longer than at 94% of the 110 Kansas stations; it reaches 227 days one year in ten and falls short of 184 one year in ten. On average 110 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 10 days longer, to about April 18, and return around October 22. Severe cold of 16°F or below comes every winter, usually between December 8 and February 28.

July is the warmest month at Pomona Lake, KS, averaging 91°F by day and 70°F at night; January is the coldest at 41°F and 22°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 4,327 growing degree days a year (base 50°F), more than at 76% of the 110 Kansas stations. 36% of them (1,559) have built up by the end of June, and July adds the most, 931. Precipitation totals 38.8 inches a year, most in May (5.5") and least in January (1.0"); May to September bring 59% of it.

The nearest other station, Ottawa, KS, 9 miles east of Pomona and 158 feet lower, has a last frost 10 days later (April 18), a first frost 11 days earlier (October 20), a season 22 days shorter.

The first measurable snow (0.1 inch or more) in Pomona usually arrives around December 9, and the last of the season around March 1. Those are the middle dates across the winters of 1991–2020 at Ottawa, KS, 9 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 38 days after the last snow.

ZIP 66076 is 7 miles from Pomona Lake, KS, which stands at 1,063 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 66524 (Overbrook). The 2023 USDA Plant Hardiness Zone Map lists ZIP 66076 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.