Frost Dates for 77320 — Huntsville, Texas

Half of springs at Huntsville Municipal Airport, TX see their last 32°F night by March 2; only one in ten is past it by January 31, and one in ten still has one after March 24. Planting tender crops after March 11 leaves a 30% risk of a frost on them, after March 16 20%, and after March 24 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 26 in half of years, as early as November 7 one year in ten, and holds off past December 19 one year in ten. A hard freeze of 28°F follows 20 days later, around December 16; in spring the one-in-ten date for 28°F is March 10, 14 days before the 32°F one. The freeze-free season lasts 272 days in a typical year, longer than at 72% of the 339 Texas stations; it reaches 307 days one year in ten and falls short of 240 one year in ten. On average 19 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 13 days longer, to about March 15, and return around November 14. Nights of 24°F, cold enough to damage hardier plants, come in 69% of winters and 16°F in 5%.

August is the warmest month at Huntsville Municipal Airport, TX, averaging 95°F by day and 74°F at night; January is the coldest at 61°F and 41°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 78% of years and March still brings one in 53% of years.

Warmth for growing adds up to 7,144 growing degree days a year (base 50°F), more than at 71% of the 351 Texas stations. 42% of them (3,034) have built up by the end of June, and August adds the most, 1,079. Precipitation totals 43.7 inches a year, most in June (4.6") and least in July (2.8"); May to September bring 41% of it.

The nearest other station, Huntsville, TX, 7 miles south of Huntsville, has a last frost 1 day earlier (March 1), a first frost 2 days later (November 28).

Measurable snow is rare here: only 1 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Huntsville, TX, 7.1 miles away, so there is no typical first-snow date to plan around.

ZIP 77320 is 6 miles from Huntsville Municipal Airport, TX, which stands at 366 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 77320 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.