Frost Dates for 37220 — Nashville, Tennessee

Half of springs at Brentwood, TN see their last 32°F night by April 15; only one in ten is past it by March 31, and one in ten still has one after May 4. Planting tender crops after April 23 leaves a 30% risk of a frost on them, after April 28 20%, and after May 4 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 84% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 13 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 8 days later, around November 3; in spring the one-in-ten date for 28°F is April 18, 16 days before the 32°F one. The freeze-free season lasts 193 days in a typical year, shorter than at 74% of the 144 Tennessee stations; it reaches 214 days one year in ten and falls short of 170 one year in ten. On average 98 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 April 28, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 9 and February 24.

July is the warmest month at Brentwood, TN, averaging 90°F by day and 66°F at night; January is the coldest at 48°F and 26°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 86% of years and May still brings one in 14% of years.

Warmth for growing adds up to 4,336 growing degree days a year (base 50°F), fewer than at 63% of the 144 Tennessee stations. 38% of them (1,633) have built up by the end of June, and July adds the most, 863.

The nearest other station, Nashville International Airport, TN, 6 miles northeast of Nashville, has a last frost 15 days earlier (March 31), a first frost 8 days later (November 3), a season 24 days longer.

The first measurable snow (0.1 inch or more) in Nashville usually arrives around December 29, and the last of the season around February 25. Those are the middle dates across the winters of 1991–2020 at Nashville International Airport, TN, 5.8 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 49 days after the last snow.

ZIP 37220 is 6 miles from Brentwood, TN, which stands at 707 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 37027 (Brentwood). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37220 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.