Frost Dates for 75459 — Howe, Texas

Half of springs at Sherman, TX see their last 32°F night by March 14; only one in ten is past it by February 25, and one in ten still has one after April 1. Planting tender crops after March 22 leaves a 30% risk of a frost on them, after March 27 20%, and after April 1 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 75% of the 339 Texas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 19 in half of years, as early as November 2 one year in ten, and holds off past December 6 one year in ten. A hard freeze of 28°F follows 11 days later, around November 30; in spring the one-in-ten date for 28°F is March 21, 11 days before the 32°F one. The freeze-free season lasts 250 days in a typical year, longer than at 52% of the 339 Texas stations; it reaches 276 days one year in ten and falls short of 225 one year in ten. On average 43 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 14 days longer, to about March 28, and return around November 9. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 67%.

July is the warmest month at Sherman, TX, averaging 93°F by day and 74°F at night; January is the coldest at 53°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 81% of years and April still brings one in 11% of years.

Warmth for growing adds up to 5,765 growing degree days a year (base 50°F), fewer than at 83% of the 351 Texas stations. 39% of them (2,238) have built up by the end of June, and July adds the most, 1,023. Precipitation totals 44.3 inches a year, most in May (5.5") and least in January (2.5"); May to September bring 43% of it.

The nearest other station, Mckinney Municipal Airport, TX, 23 miles south of Howe and 174 feet lower, has a last frost 3 days later (March 17), a first frost 4 days earlier (November 15), a season 9 days shorter.

Measurable snow is rare here: only 7 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Sherman, TX, 12.7 miles away, so there is no typical first-snow date to plan around.

ZIP 75459 is 13 miles from Sherman, TX, which stands at 760 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 75092 (Sherman). The 2023 USDA Plant Hardiness Zone Map lists ZIP 75459 in zone 8a, the band where the coldest night of the year averaged 10 to 15°F (-12.2 to -9.4°C) over 1991–2020; a zone describes winter lows, not frost dates.