Frost dates / Massachusetts / Newton

Frost dates in Newton, MA

The station on this page is JAMAICA PLAIN, MA US (USC00193890), 4.7 miles from the city point. Population in the Census 2024 estimate is 90,700.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 02461 (1 miles from the city point used on this page).

Median last 32°F is April 19. Median first 32°F is October 23. The 50% growing-season length is 185 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 6	Earlier date. A last 32°F on or after this day is common.
50%	April 19	Median.
10%	May 3	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 5	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%	204
50%	185
90%	165

28°F threshold

	10%	50%	90%
Last, on or after	April 21	April 5	March 25
First, on or before	October 19	November 3	November 19
Season at least	230 days	210 days	191 days

36°F threshold

	10%	50%	90%
Last, on or after	May 16	May 2	April 20
First, on or before	September 30	October 10	October 25
Season at least	181 days	161 days	144 days

Station JAMAICA PLAIN, MA US (USC00193890). Completeness flag S, 25 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 29 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

Newton, 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: JAMAICA PLAIN, MA US (USC00193890), 4.7 miles. Median last 32°F April 19. Median first 32°F October 23. The 50% growing-season length is 185 days.

Open the ZIP page

32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 3	April 19	April 6
First 32°F on or before	October 8	October 23	November 5

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.

A wall calendar surrounded by vegetables, herbs, seed packets, and watering cans.

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.

Date checks use your device’s calendar and appear after the page loads.