Frost Dates for 78624 — Fredericksburg, Texas

Half of springs at Fredericksburg, TX see their last 32°F night by March 18; only one in ten is past it by February 27, and one in ten still has one after April 9. Planting tender crops after March 28 leaves a 30% risk of a frost on them, after April 2 20%, and after April 9 10%. The 22 days between the even-odds date and the one-in-ten date is wider than at 63% 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 10 in half of years, as early as October 27 one year in ten, and holds off past November 28 one year in ten. A hard freeze of 28°F follows 12 days later, around November 22; in spring the one-in-ten date for 28°F is March 24, 16 days before the 32°F one. The freeze-free season lasts 235 days in a typical year, shorter than at 69% of the 339 Texas stations; it reaches 261 days one year in ten and falls short of 211 one year in ten. On average 42 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 16 days longer, to about April 3, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 57%.

August is the warmest month at Fredericksburg, TX, averaging 94°F by day and 70°F at night; January is the coldest at 60°F and 34°F. A freezing night is all but certain in every month from November 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 24% of years.

Warmth for growing adds up to 6,171 growing degree days a year (base 50°F), fewer than at 61% of the 351 Texas stations. 41% of them (2,554) have built up by the end of June, and August adds the most, 998. Precipitation totals 30.7 inches a year, most in May (4.3") and least in January (1.6"); May to September bring 49% of it.

The nearest other station, Harper 3ENE, TX, 19 miles west of Fredericksburg and 425 feet higher, has a last frost 3 days earlier (March 15), a first frost 5 days later (November 15), a season 8 days longer.

Measurable snow is rare here: only 3 of 24 winters from 1991 to 2020 recorded 0.1 inch or more at Fredericksburg, TX, 3.1 miles away, so there is no typical first-snow date to plan around.

ZIP 78624 is 3 miles from Fredericksburg, TX, which stands at 1,685 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 78624 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.