Frost Dates for 78633 — Georgetown, Texas

Half of springs at Georgetown Lake, TX see their last 32°F night by March 6; only one in ten is past it by February 13, and one in ten still has one after March 30. Planting tender crops after March 15 leaves a 30% risk of a frost on them, after March 22 20%, and after March 30 10%. The 24 days between the even-odds date and the one-in-ten date is wider than at 76% 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 24 in half of years, as early as November 5 one year in ten, and holds off past December 10 one year in ten. A hard freeze of 28°F follows 11 days later, around December 5; in spring the one-in-ten date for 28°F is March 16, 14 days before the 32°F one. The freeze-free season lasts 259 days in a typical year, longer than at 62% of the 339 Texas stations; it reaches 289 days one year in ten and falls short of 231 one year in ten. On average 28 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 March 22, and return around November 13. Nights of 24°F, cold enough to damage hardier plants, come in 93% of winters and 16°F in 28%.

August is the warmest month at Georgetown Lake, TX, averaging 97°F by day and 72°F at night; January is the coldest at 60°F and 36°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 65% of years.

Warmth for growing adds up to 6,670 growing degree days a year (base 50°F), more than at 61% of the 351 Texas stations. 41% of them (2,720) have built up by the end of June, and August adds the most, 1,066. Precipitation totals 37.1 inches a year, most in May (4.3") and least in February (2.2"); May to September bring 46% of it.

The nearest other station, Austin Great Hills, TX, 20 miles south of Georgetown, has a last frost 5 days later (March 11), a first frost 4 days earlier (November 20), a season 5 days shorter.

Measurable snow is rare here: only 0 of 24 winters from 1991 to 2020 recorded 0.1 inch or more at Georgetown Lake, TX, 1.7 miles away, so there is no typical first-snow date to plan around.

ZIP 78633 is 2 miles from Georgetown Lake, TX, which stands at 874 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 78626 (Georgetown). The 2023 USDA Plant Hardiness Zone Map lists ZIP 78633 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.