Frost dates / Connecticut / Stamford

Frost dates in Stamford, CT

The station on this page is STAMFORD 5 N, CT US (USC00067970), 3.1 miles from the city point. Population in the Census 2024 estimate is 139,134.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 06905 (0.6 miles from the city point used on this page).

Median last 32°F is April 17. Median first 32°F is October 23. The 50% growing-season length is 188 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%	April 3	Earlier date. A last 32°F on or after this day is common.
50%	April 17	Median.
10%	May 2	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 8	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 23	Median.
90%	November 6	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%	208
50%	188
90%	168

28°F threshold

	10%	50%	90%
Last, on or after	April 19	April 3	March 20
First, on or before	October 18	November 2	November 19
Season at least	233 days	212 days	192 days

36°F threshold

	10%	50%	90%
Last, on or after	May 16	April 30	April 16
First, on or before	October 1	October 12	October 25
Season at least	183 days	163 days	144 days

Station STAMFORD 5 N, CT US (USC00067970). Completeness flag R, 22 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 57.9 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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Stamford, CT

Zone 7aAverage annual extreme minimum 0°F to 5°F

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

Connecticut. Nearest qualified station: STAMFORD 5 N, CT US (USC00067970), 3.1 miles. Median last 32°F April 17. Median first 32°F October 23. The 50% growing-season length is 188 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 2	April 17	April 3
First 32°F on or before	October 8	October 23	November 6

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 Connecticut 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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