Frost Dates for 38556 — Jamestown, Tennessee

Half of springs at Jamestown, TN see their last 32°F night by April 20; only one in ten is past it by April 6, and one in ten still has one after May 8. Planting tender crops after April 28 leaves a 30% risk of a frost on them, after May 2 20%, and after May 8 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 October 22 in half of years, as early as October 10 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 9 days later, around October 31; in spring the one-in-ten date for 28°F is April 25, 13 days before the 32°F one. The freeze-free season lasts 183 days in a typical year, shorter than at 92% of the 144 Tennessee stations; it reaches 203 days one year in ten and falls short of 163 one year in ten. On average 103 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 May 2, and return around October 14. Severe cold of 16°F or below comes every winter, usually between December 7 and February 27.

July is the warmest month at Jamestown, TN, averaging 84°F by day and 64°F at night; January is the coldest at 45°F and 25°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 23% of years.

Warmth for growing adds up to 3,666 growing degree days a year (base 50°F), fewer than at 91% of the 144 Tennessee stations. 37% of them (1,372) have built up by the end of June, and July adds the most, 747. Precipitation totals 59.2 inches a year, most in December (6.3") and least in October (3.2"); May to September bring 42% of it.

The nearest other station, Allardt, TN, 4 miles southeast of Jamestown, has a last frost 3 days earlier (April 17), a first frost 1 day later (October 23), a season 5 days longer.

The first measurable snow (0.1 inch or more) in Jamestown usually arrives around December 12, and the last of the season around March 18. Those are the middle dates across the winters of 1991–2020 at Jamestown, TN, 1.2 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 33 days after the last snow.

ZIP 38556 is 1 mile from Jamestown, TN, which stands at 1,690 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 38556 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.