Frost Dates for 78382 — Rockport, Texas

In the 89% of winters that bring a 32°F night, half of springs at Rockport, TX see their last 32°F night by January 31; only one in ten is past it by December 26, and one in ten still has one after February 28. Counting the winters with no freeze at all, the risk of a 32°F night after February 28 is under 9% and after January 31 45%. The 28 days between the even-odds date and the one-in-ten date is wider than at 89% 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 25 in half of years, as early as November 28 one year in ten, and holds off past January 31 one year in ten. A hard freeze of 28°F follows 11 days later, around January 5; in spring the one-in-ten date for 28°F is February 20, 8 days before the 32°F one. The freeze-free season lasts 328 days in a typical year, longer than at 94% of the 339 Texas stations; it reaches 365 days one year in ten and falls short of 289 one year in ten. On average 4 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 February 16, and return around December 6. A 24°F night is unusual: 18% of winters had one.

August is the warmest month at Rockport, TX, averaging 93°F by day and 79°F at night; January is the coldest at 66°F and 46°F. From March to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 37% of years.

Warmth for growing adds up to 8,283 growing degree days a year (base 50°F), more than at 92% of the 351 Texas stations. 43% of them (3,563) have built up by the end of June, and August adds the most, 1,114. Precipitation totals 36.6 inches a year, most in September (5.7") and least in December (1.9"); May to September bring 50% of it.

The nearest other station, Port Aransas, TX, 15 miles south of Rockport, has a 32°F night in 37% of winters against 89% here, and a coolest-month low 4°F warmer (50°F).

Measurable snow is rare here: only 1 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Rockport, TX, 2.1 miles away, so there is no typical first-snow date to plan around.

ZIP 78382 is 2 miles from Rockport, TX, which stands at 8 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 78382 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°C) over 1991–2020; a zone describes winter lows, not frost dates.