Frost dates / Vermont / Burlington

Frost dates in Burlington, VT

The station on this page is BURLINGTON INTL AP, VT US (USW00014742), 4.7 miles from the city point. Population in the Census 2024 estimate is 44,432.

Zone 5bUSDA average annual extreme minimum -15°F to -10°F, from ZIP 05401 (1.6 miles from the city point used on this page).

Median last 32°F is April 29. Median first 32°F is October 15. The 50% growing-season length is 169 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 17	Earlier date. A last 32°F on or after this day is common.
50%	April 29	Median.
10%	May 11	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 2	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 15	Median.
90%	November 1	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%	187
50%	169
90%	149

28°F threshold

	10%	50%	90%
Last, on or after	April 30	April 18	April 5
First, on or before	October 12	October 28	November 12
Season at least	211 days	193 days	173 days

36°F threshold

	10%	50%	90%
Last, on or after	May 23	May 8	April 27
First, on or before	September 23	October 4	October 19
Season at least	166 days	147 days	129 days

Station BURLINGTON INTL AP, VT US (USW00014742). Completeness flag S, 29 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 100.6 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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Burlington, VT

Zone 5bAverage annual extreme minimum -15°F to -10°F

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

Vermont. Nearest qualified station: BURLINGTON INTL AP, VT US (USW00014742), 4.7 miles. Median last 32°F April 29. Median first 32°F October 15. The 50% growing-season length is 169 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 11	April 29	April 17
First 32°F on or before	October 2	October 15	November 1

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 Vermont 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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