Frost dates / Tennessee / Johnson City

Frost dates in Johnson City, TN

The station on this page is BRISTOL TRI CITY AP, TN US (USW00013877), 9.1 miles from the city point. Population in the Census 2024 estimate is 73,635.

Zone 7bUSDA average annual extreme minimum 5°F to 10°F, from ZIP 37614 (3 miles from the city point used on this page).

Median last 32°F is April 16. Median first 32°F is October 24. The 50% growing-season length is 190 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	March 30	Earlier date. A last 32°F on or after this day is common.
50%	April 16	Median.
10%	May 5	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	October 11	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 24	Median.
90%	November 4	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	210
50%	190
90%	166

28°F threshold

	10%	50%	90%
Last, on or after	April 18	April 1	March 16
First, on or before	October 19	November 1	November 15
Season at least	235 days	212 days	192 days

36°F threshold

	10%	50%	90%
Last, on or after	May 17	April 29	April 14
First, on or before	October 4	October 15	October 28
Season at least	188 days	169 days	147 days

Station BRISTOL TRI CITY AP, TN US (USW00013877). Completeness flag S, 28 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 457.2 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Johnson City, TN

Zone 7bAverage annual extreme minimum 5°F to 10°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Tennessee. Nearest qualified station: BRISTOL TRI CITY AP, TN US (USW00013877), 9.1 miles. Median last 32°F April 16. Median first 32°F October 24. The 50% growing-season length is 190 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 5	April 16	March 30
First 32°F on or before	October 11	October 24	November 4

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Tennessee are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

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