Frost dates / New Jersey / Plainfield

Frost dates in Plainfield, NJ

The station on this page is PLAINFIELD, NJ US (USC00287079), 1.1 miles from the city point. Population in the Census 2024 estimate is 56,507.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 07060 (0.3 miles from the city point used on this page).

Median last 32°F is April 11. Median first 32°F is October 28. The 50% growing-season length is 198 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%	March 31	Earlier date. A last 32°F on or after this day is common.
50%	April 11	Median.
10%	April 27	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 13	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 28	Median.
90%	November 10	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%	218
50%	198
90%	176

28°F threshold

	10%	50%	90%
Last, on or after	April 11	March 31	March 16
First, on or before	October 24	November 7	November 23
Season at least	246 days	223 days	202 days

36°F threshold

	10%	50%	90%
Last, on or after	May 13	April 27	April 12
First, on or before	October 3	October 17	November 1
Season at least	192 days	173 days	152 days

Station PLAINFIELD, NJ US (USC00287079). Completeness flag R, 13 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 27.4 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

Planting calendar for Plainfield · Zone 7a

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Plainfield, NJ

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

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

New Jersey. Nearest qualified station: PLAINFIELD, NJ US (USC00287079), 1.1 miles. Median last 32°F April 11. Median first 32°F October 28. The 50% growing-season length is 198 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 27	April 11	March 31
First 32°F on or before	October 13	October 28	November 10

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

Windows below are from Rutgers NJAES, FS129: Planning a Vegetable Garden, retrieved 2026-10-10. The fact sheet gives one statewide month list. Footnote dated April 2020: Mr=March; Ap=April; Ma=May; Ju=June; Jl=July; Au=August; Se=September. Consecutive months are stored as one range; a gap, such as April and July, stays two windows.

Crop

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