Frost dates / New Jersey / Trenton
Frost dates in Trenton, NJ
The station on this page is TRENTON STATE COLLEGE, NJ US (USC00288880), 3.6 miles from the city point. Population in the Census 2024 estimate is 91,193.
Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 08609 (1.2 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 17 | Median. |
| 10% | May 6 | 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 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% | 214 |
| 50% | 192 |
| 90% | 168 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 17 | April 2 | March 18 |
| First, on or before | October 25 | November 7 | November 24 |
| Season at least | 241 days | 217 days | 197 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 17 | May 1 | April 16 |
| First, on or before | October 1 | October 15 | October 30 |
| Season at least | 187 days | 165 days | 144 days |
Station TRENTON STATE COLLEGE, NJ US (USC00288880). Completeness flag R, 11 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 30.5 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 Trenton · Zone 7a
Check a crop against this station
Trenton, 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: TRENTON STATE COLLEGE, NJ US (USC00288880), 3.6 miles. Median last 32°F April 17. Median first 32°F October 28. The 50% growing-season length is 192 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 6 | April 17 | April 2 |
| First 32°F on or before | October 11 | 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.
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.
Date checks use your device’s calendar and appear after the page loads.