Frost Dates for 78676 — Wimberley, Texas

Half of springs at Canyon Dam, TX see their last 32°F night by March 1; only one in ten is past it by January 31, and one in ten still has one after March 22. Planting tender crops after March 8 leaves a 30% risk of a frost on them, after March 13 20%, and after March 22 10%. The 21 days between the even-odds date and the one-in-ten date is wider than at 50% 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 December 1 in half of years, as early as November 9 one year in ten, and holds off past December 26 one year in ten. A hard freeze of 28°F follows 18 days later, around December 19; in spring the one-in-ten date for 28°F is March 9, 13 days before the 32°F one. The freeze-free season lasts 276 days in a typical year, longer than at 76% of the 339 Texas stations; it reaches 313 days one year in ten and falls short of 244 one year in ten. On average 18 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 11 days longer, to about March 12, and return around November 16. Nights of 24°F, cold enough to damage hardier plants, come in 65% of winters and 16°F in 4%.

August is the warmest month at Canyon Dam, TX, averaging 96°F by day and 73°F at night; January is the coldest at 61°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 75% of years and March still brings one in 49% of years.

Warmth for growing adds up to 6,930 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, 1,063. Precipitation totals 37.9 inches a year, most in October (4.9") and least in February (2.0"); May to September bring 46% of it.

The nearest other station, San Marcos, TX, 15 miles southeast of Wimberley and 335 feet lower, has a last frost 1 day earlier (February 28), a first frost 2 days earlier (November 29), a season 3 days shorter.

Measurable snow is rare here: only 2 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Wimberley 1 NW, TX, 2.2 miles away, so there is no typical first-snow date to plan around.

ZIP 78676 is 12 miles from Canyon Dam, TX, which stands at 1,000 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 78133 (Canyon Lake). The 2023 USDA Plant Hardiness Zone Map lists ZIP 78676 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.