Frost Dates for 76645 — Hillsboro, Texas

Half of springs at Hillsboro, TX see their last 32°F night by March 21; only one in ten is past it by March 2, and one in ten still has one after April 8. Planting tender crops after March 30 leaves a 30% risk of a frost on them, after April 2 20%, and after April 8 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 75% of the 339 Texas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 10 in half of years, as early as October 28 one year in ten, and holds off past November 29 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 29, 10 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 209 one year in ten. On average 37 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 April 2, and return around November 3. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 66%.

August is the warmest month at Hillsboro, TX, averaging 97°F by day and 73°F at night; January is the coldest at 59°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 87% of years and April still brings one in 24% of years.

Warmth for growing adds up to 6,434 growing degree days a year (base 50°F), more than at 52% of the 351 Texas stations. 40% of them (2,549) have built up by the end of June, and August adds the most, 1,082. Precipitation totals 38.9 inches a year, most in October (5.1") and least in July (1.7"); May to September bring 39% of it.

The nearest other station, Whitney Dam, TX, 18 miles southwest of Hillsboro, has a last frost 6 days earlier (March 15), a first frost 4 days later (November 14), a season 8 days longer.

Measurable snow is rare here: only 5 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Hillsboro, TX, 0.8 miles away, so there is no typical first-snow date to plan around.

ZIP 76645 is under a mile from Hillsboro, TX, which stands at 550 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 76645 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.