Frost Dates for 37067 — Franklin, Tennessee

Half of springs at Franklin Sewage Plt, TN see their last 32°F night by April 3; only one in ten is past it by March 17, and one in ten still has one after April 20. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 20 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 34% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 31 in half of years, as early as October 18 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 10 days later, around November 10; in spring the one-in-ten date for 28°F is April 8, 12 days before the 32°F one. The freeze-free season lasts 210 days in a typical year, longer than at 69% of the 144 Tennessee stations; it reaches 233 days one year in ten and falls short of 190 one year in ten. On average 84 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 16, and return around October 22. Severe cold of 16°F or below comes in 95% of winters, usually between December 29 and February 7.

July is the warmest month at Franklin Sewage Plt, TN, averaging 91°F by day and 69°F at night; January is the coldest at 49°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 58% of years.

Warmth for growing adds up to 4,769 growing degree days a year (base 50°F), more than at 83% of the 144 Tennessee stations. 38% of them (1,806) have built up by the end of June, and July adds the most, 919. Precipitation totals 54.0 inches a year, most in May (5.4") and least in October (3.5"); May to September bring 41% of it.

The nearest other station, Brentwood, TN, 5 miles north of Franklin, has a last frost 12 days later (April 15), a first frost 5 days earlier (October 26), a season 17 days shorter.

The first measurable snow (0.1 inch or more) in Franklin usually arrives around January 6, and the last of the season around February 27. Those are the middle dates across the winters of 1991–2020 at Thompson Stn, TN, 13.4 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 35 days after the last snow.

ZIP 37067 is 4 miles from Franklin Sewage Plt, TN, which stands at 655 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 37064 (Franklin). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37067 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.