Frost Dates for 77880 — Washington, Texas

Half of springs at Washington Sp, TX see their last 32°F night by March 7; only one in ten is past it by February 10, and one in ten still has one after March 31. Planting tender crops after March 16 leaves a 30% risk of a frost on them, after March 22 20%, and after March 31 10%. The 24 days between the even-odds date and the one-in-ten date is wider than at 76% of the 339 Texas stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by November 19 in half of years, as early as November 1 one year in ten, and holds off past December 11 one year in ten. A hard freeze of 28°F follows 14 days later, around December 3; in spring the one-in-ten date for 28°F is March 16, 15 days before the 32°F one. The freeze-free season lasts 259 days in a typical year, longer than at 62% of the 339 Texas stations; it reaches 291 days one year in ten and falls short of 229 one year in ten. On average 31 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 15 days longer, to about March 22, and return around November 7. Nights of 24°F, cold enough to damage hardier plants, come in 86% of winters and 16°F in 15%.

August is the warmest month at Washington Sp, TX, averaging 96°F by day and 73°F at night; January is the coldest at 62°F and 38°F. A freezing night is all but certain in every month from December to January (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 86% of years and March still brings one in 61% of years.

Warmth for growing adds up to 6,917 growing degree days a year (base 50°F), more than at 67% of the 351 Texas stations. 42% of them (2,876) have built up by the end of June, and August adds the most, 1,071. Precipitation totals 44.1 inches a year, most in May (4.7") and least in July (2.2"); May to September bring 42% of it.

The nearest other station, Brenham, TX, 16 miles southwest of Washington, has a last frost 5 days earlier (March 2), a first frost 11 days later (November 30), a season 14 days longer.

Measurable snow is rare here: only 0 of 29 winters from 1991 to 2020 recorded 0.1 inch or more at Washington Sp, TX, 3 miles away, so there is no typical first-snow date to plan around.

ZIP 77880 is 3 miles from Washington Sp, TX, which stands at 215 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 77868 (Navasota). The 2023 USDA Plant Hardiness Zone Map lists ZIP 77880 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.