Frost Dates for 37419 — Chattanooga, Tennessee

Half of springs at Lookout Mountain-Point Park, TN see their last 32°F night by March 31; only one in ten is past it by March 15, and one in ten still has one after April 18. Planting tender crops after April 7 leaves a 30% risk of a frost on them, after April 12 20%, and after April 18 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 67% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 6 in half of years, as early as October 24 one year in ten, and holds off past November 26 one year in ten. A hard freeze of 28°F follows 11 days later, around November 17; in spring the one-in-ten date for 28°F is April 6, 12 days before the 32°F one. The freeze-free season lasts 219 days in a typical year, longer than at 88% of the 144 Tennessee stations; it reaches 244 days one year in ten and falls short of 196 one year in ten. On average 69 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 12 days longer, to about April 12, and return around October 29. Severe cold of 16°F or below comes in 97% of winters, usually between December 31 and February 10.

July is the warmest month at Lookout Mountain-Point Park, TN, averaging 84°F by day and 67°F at night; January is the coldest at 46°F and 29°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 50% of years.

Warmth for growing adds up to 4,113 growing degree days a year (base 50°F), fewer than at 76% of the 144 Tennessee stations. 38% of them (1,561) have built up by the end of June, and July adds the most, 794. Precipitation totals 58.6 inches a year, most in February (6.0") and least in October (3.8"); May to September bring 38% of it.

The nearest other station, Chickamauga Pk Larc, GA, 10 miles southeast of Chattanooga and 1,328 feet lower, has a last frost 6 days later (April 6), a first frost 7 days earlier (October 30), a season 14 days shorter.

Measurable snow is rare here: only 0 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Chickamauga Park, GA, 10.7 miles away, so there is no typical first-snow date to plan around.

ZIP 37419 is 2 miles from Lookout Mountain-Point Park, TN, which stands at 2,110 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 37405 (Chattanooga). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37419 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.