Frost Dates for 75657 — Jefferson, Texas

Half of springs at Jefferson, TX see their last 32°F night by March 18; only one in ten is past it by February 28, and one in ten still has one after April 7. Planting tender crops after March 27 leaves a 30% risk of a frost on them, after April 1 20%, and after April 7 10%. The 20 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 339 Texas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 8 in half of years, as early as October 26 one year in ten, and holds off past November 30 one year in ten. A hard freeze of 28°F follows 14 days later, around November 22; in spring the one-in-ten date for 28°F is March 22, 16 days before the 32°F one. The freeze-free season lasts 236 days in a typical year, shorter than at 67% of the 339 Texas stations; it reaches 263 days one year in ten and falls short of 210 one year in ten. On average 55 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 April 2, and return around October 30. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 43%.

July is the warmest month at Jefferson, TX, averaging 94°F by day and 72°F at night; January is the coldest at 57°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 September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 84% of years and April still brings one in 21% of years.

Warmth for growing adds up to 6,002 growing degree days a year (base 50°F), fewer than at 72% of the 351 Texas stations. 40% of them (2,426) have built up by the end of June, and July adds the most, 1,026. Precipitation totals 49.7 inches a year, most in May (5.1") and least in August (2.4"); May to September bring 39% of it.

The nearest other station, Marshall, TX, 19 miles south of Jefferson, has a last frost 2 days later (March 20), a first frost 3 days later (November 11), a season 3 days shorter.

Measurable snow is rare here: only 7 of 16 winters from 1991 to 2020 recorded 0.1 inch or more at Jefferson, TX, 0.6 miles away, so there is no typical first-snow date to plan around.

ZIP 75657 is under a mile from Jefferson, TX, which stands at 211 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 75657 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.