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Frost dates / Massachusetts / Chicopee

Frost dates in Chicopee, MA

The station on this page is WESTFIELD BARNES MUNI AP, MA US (USW00014775), 7.6 miles from the city point. Population in the Census 2024 estimate is 55,381.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 01020 (0.5 miles from the city point used on this page).

Median last 32°F is May 3. Median first 32°F is October 8. The 50% growing-season length is 158 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.

ProbabilityDateHow to read it
90%April 20Earlier date. A last 32°F on or after this day is common.
50%May 3Median.
10%May 17Later 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.

ProbabilityDateHow to read it
10%September 26Earlier date. A first 32°F on or before this day is uncommon.
50%October 8Median.
90%October 25Later 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 longDays
10%179
50%158
90%139

28°F threshold

10%50%90%
Last, on or afterMay 5April 21April 6
First, on or beforeOctober 6October 20November 5
Season at least205 days184 days163 days

36°F threshold

10%50%90%
Last, on or afterMay 28May 14May 1
First, on or beforeSeptember 16September 30October 11
Season at least156 days138 days121 days

Station WESTFIELD BARNES MUNI AP, MA US (USW00014775). 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 82.6 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

Check a crop against this station

Chicopee, MA

Zone 6aAverage annual extreme minimum -10°F to -5°F

Median last 32°F is May 3. Median first 32°F is October 8. The 50% growing-season length is 158 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%

Massachusetts. Nearest qualified station: WESTFIELD BARNES MUNI AP, MA US (USW00014775), 7.6 miles. Median last 32°F May 3. Median first 32°F October 8. The 50% growing-season length is 158 days.

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32°F probabilities at this station
10%50%90%
Last 32°F on or afterMay 17May 3April 20
First 32°F on or beforeSeptember 26October 8October 25

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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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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