Frost dates / New Jersey / Perth Amboy
Frost dates in Perth Amboy, NJ
The station on this page is NEW BRUNSWICK 3 SE, NJ US (USC00286055), 8.6 miles from the city point. Population in the Census 2024 estimate is 56,939.
Zone 7bUSDA average annual extreme minimum 5°F to 10°F, from ZIP 08861 (0.1 miles from the city point used on this page).
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 2 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 15 | Median. |
| 10% | May 1 | 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 11 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 26 | Median. |
| 90% | November 8 | 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% | 214 |
| 50% | 193 |
| 90% | 171 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 17 | April 2 | March 18 |
| First, on or before | October 23 | November 7 | November 23 |
| Season at least | 239 days | 218 days | 199 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 14 | April 29 | April 14 |
| First, on or before | October 3 | October 14 | October 30 |
| Season at least | 189 days | 169 days | 147 days |
Station NEW BRUNSWICK 3 SE, NJ US (USC00286055). Completeness flag S, 30 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 33.8 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 Perth Amboy · Zone 7b
Check a crop against this station
Perth Amboy, NJ
Zone 7bAverage annual extreme minimum 5°F to 10°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
New Jersey. Nearest qualified station: NEW BRUNSWICK 3 SE, NJ US (USC00286055), 8.6 miles. Median last 32°F April 15. Median first 32°F October 26. The 50% growing-season length is 193 days.
Open the ZIP page · Crop guides for New Jersey
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | May 1 | April 15 | April 2 |
| First 32°F on or before | October 11 | October 26 | November 8 |
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.
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.
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