Frost Dates for 78155 — Seguin, Texas

Half of springs at Austin San Antonio, TX see their last 32°F night by March 1; only one in ten is past it by February 3, and one in ten still has one after March 20. Planting tender crops after March 8 leaves a 30% risk of a frost on them, after March 13 20%, and after March 20 10%. The 19 days between the even-odds date and the one-in-ten date is narrower than at 63% of the 339 Texas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 26 in half of years, as early as November 8 one year in ten, and holds off past December 20 one year in ten. A hard freeze of 28°F follows 15 days later, around December 11; in spring the one-in-ten date for 28°F is March 10, 10 days before the 32°F one. The freeze-free season lasts 273 days in a typical year, longer than at 73% of the 339 Texas stations; it reaches 307 days one year in ten and falls short of 244 one year in ten. On average 20 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 12 days longer, to about March 13, and return around November 15. Nights of 24°F, cold enough to damage hardier plants, come in 74% of winters and 16°F in 7%.

August is the warmest month at Austin San Antonio, TX, averaging 98°F by day and 73°F at night; January is the coldest at 64°F and 40°F. A freezing night is all but certain in 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 80% of years and March still brings one in 50% of years.

Warmth for growing adds up to 7,389 growing degree days a year (base 50°F), more than at 77% of the 351 Texas stations. 43% of them (3,156) have built up by the end of June, and August adds the most, 1,088. Precipitation totals 31.2 inches a year, most in May (3.6") and least in February (1.7"); May to September bring 47% of it.

The nearest other station, New Braunfels, TX, 14 miles northwest of Seguin, has a last frost 7 days later (March 8), a first frost 8 days earlier (November 18), a season 20 days shorter.

Measurable snow is rare here: only 0 of 23 winters from 1991 to 2020 recorded 0.1 inch or more at Seguin 1 SSW, TX, 1 miles away, so there is no typical first-snow date to plan around.

ZIP 78155 is 10 miles from Austin San Antonio, TX, which stands at 633 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 78155 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.