Frost Dates for 77303 — Conroe, Texas

Half of springs at Conroe Montgomery Co Airport, TX see their last 32°F night by March 11; only one in ten is past it by February 14, and one in ten still has one after April 3. Planting tender crops after March 21 leaves a 30% risk of a frost on them, after March 27 20%, and after April 3 10%. The 23 days between the even-odds date and the one-in-ten date is wider than at 72% 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 19 in half of years, as early as November 1 one year in ten, and holds off past December 9 one year in ten. A hard freeze of 28°F follows 15 days later, around December 4; in spring the one-in-ten date for 28°F is March 18, 16 days before the 32°F one. The freeze-free season lasts 253 days in a typical year, longer than at 56% of the 339 Texas stations; it reaches 286 days one year in ten and falls short of 224 one year in ten. On average 27 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 24, and return around November 8. Nights of 24°F, cold enough to damage hardier plants, come in 83% of winters and 16°F in 9%.

August is the warmest month at Conroe Montgomery Co Airport, TX, averaging 95°F by day and 72°F at night; January is the coldest at 62°F and 39°F. A freezing night is all but certain in every month from December to January (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 84% of years and March still brings one in 67% of years and April still brings one in 14% of years.

Warmth for growing adds up to 6,776 growing degree days a year (base 50°F), more than at 64% of the 351 Texas stations. 42% of them (2,863) have built up by the end of June, and August adds the most, 1,024. Precipitation totals 47.7 inches a year, most in October (5.5") and least in February (2.9"); May to September bring 42% of it.

The nearest other station, Conroe, TX, 6 miles southwest of Conroe, has a last frost 15 days earlier (February 24), a first frost 13 days later (December 2), a season 32 days longer.

Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Conroe, TX, 5.5 miles away, so there is no typical first-snow date to plan around.

ZIP 77303 is 1 mile from Conroe Montgomery Co Airport, TX, which stands at 245 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 77303 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.