Frost dates / Massachusetts / Lowell

Frost dates in Lowell, MA

The station on this page is LOWELL, MA US (USC00194313), 2.2 miles from the city point. Population in the Census 2024 estimate is 120,418.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 01851 (1.1 miles from the city point used on this page).

Median last 32°F is April 30. Median first 32°F is October 10. The 50% growing-season length is 164 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 19	Earlier date. A last 32°F on or after this day is common.
50%	April 30	Median.
10%	May 10	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%	September 30	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 10	Median.
90%	October 24	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%	179
50%	164
90%	148

28°F threshold

	10%	50%	90%
Last, on or after	April 29	April 18	April 7
First, on or before	October 9	October 22	November 5
Season at least	205 days	187 days	169 days

36°F threshold

	10%	50%	90%
Last, on or after	May 21	May 9	April 30
First, on or before	September 21	October 1	October 12
Season at least	158 days	144 days	126 days

Station LOWELL, MA US (USC00194313). 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 33.5 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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Lowell, MA

Zone 6bAverage annual extreme minimum -5°F to 0°F

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

Massachusetts. Nearest qualified station: LOWELL, MA US (USC00194313), 2.2 miles. Median last 32°F April 30. Median first 32°F October 10. The 50% growing-season length is 164 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 10	April 30	April 19
First 32°F on or before	September 30	October 10	October 24

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 Massachusetts 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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