Frost Dates for 75074 — Plano, Texas

Half of springs at Richardson, TX see their last 32°F night by March 7; only one in ten is past it by February 18, and one in ten still has one after March 29. Planting tender crops after March 14 leaves a 30% risk of a frost on them, after March 19 20%, and after March 29 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 21 in half of years, as early as November 2 one year in ten, and holds off past December 9 one year in ten. A hard freeze of 28°F follows 13 days later, around December 4; in spring the one-in-ten date for 28°F is March 12, 17 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 285 days one year in ten and falls short of 232 one year in ten. On average 35 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 14 days longer, to about March 21, and return around November 10. Nights of 24°F, cold enough to damage hardier plants, come in 96% of winters and 16°F in 33%.

July is the warmest month at Richardson, TX, averaging 94°F by day and 75°F at night; January is the coldest at 56°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 67% of years.

Warmth for growing adds up to 6,359 growing degree days a year (base 50°F), fewer than at 51% of the 351 Texas stations. 40% of them (2,558) have built up by the end of June, and July adds the most, 1,079. Precipitation totals 42.0 inches a year, most in October (5.3") and least in July (2.2"); May to September bring 40% of it.

The nearest other station, Lavon Dam, TX, 11 miles east of Plano and 168 feet lower, has a last frost 3 days later (March 10), a first frost 2 days earlier (November 19), a season 5 days shorter.

Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Richardson, TX, 4.2 miles away, so there is no typical first-snow date to plan around.

ZIP 75074 is 4 miles from Richardson, TX, which stands at 678 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 28 other ZIP codes share the station; its figures are presented in full for 75035 (Frisco). The 2023 USDA Plant Hardiness Zone Map lists ZIP 75074 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.