Frost Dates for 37074 — Hartsville, Tennessee

Half of springs at Hartsville, TN see their last 32°F night by April 12; only one in ten is past it by March 29, and one in ten still has one after April 29. Planting tender crops after April 19 leaves a 30% risk of a frost on them, after April 22 20%, and after April 29 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 26 in half of years, as early as October 13 one year in ten, and holds off past November 6 one year in ten. A hard freeze of 28°F follows 9 days later, around November 4; in spring the one-in-ten date for 28°F is April 15, 14 days before the 32°F one. The freeze-free season lasts 196 days in a typical year, shorter than at 69% of the 144 Tennessee stations; it reaches 215 days one year in ten and falls short of 174 one year in ten. On average 82 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 April 26, and return around October 17. Severe cold of 16°F or below comes in 99% of winters, usually between December 18 and February 19.

July is the warmest month at Hartsville, TN, averaging 88°F by day and 66°F at night; January is the coldest at 48°F and 27°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 84% of years.

Warmth for growing adds up to 4,291 growing degree days a year (base 50°F), fewer than at 66% of the 144 Tennessee stations. 37% of them (1,599) have built up by the end of June, and July adds the most, 837.

The nearest other station, Bethpage 1 S, TN, 10 miles west of Hartsville, has a last frost 4 days later (April 16), a first frost 3 days earlier (October 23), a season 7 days shorter.

The first measurable snow (0.1 inch or more) in Hartsville usually arrives around January 10, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Lafayette, TN, 10.3 miles away: half of years saw snow earlier, half later. Snow fell in 86% of those winters. The last 32°F night of spring typically comes 60 days after the last snow.

ZIP 37074 is 3 miles from Hartsville, TN, which stands at 511 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 37074 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.