Frost dates / New York / Mount Vernon
Frost dates in Mount Vernon, NY
The station on this page is BRONX, NY US (USC00300961), 5.4 miles from the city point. Population in the Census 2024 estimate is 71,999.
Zone 7bUSDA average annual extreme minimum 5°F to 10°F, from ZIP 10553 (0.5 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% | March 19 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 1 | Median. |
| 10% | April 12 | 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% | November 2 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 16 | Median. |
| 90% | December 4 | 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% | 250 |
| 50% | 230 |
| 90% | 211 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 3 | March 23 | March 8 |
| First, on or before | November 13 | November 30 | December 17 |
| Season at least | 274 days | 252 days | 231 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 26 | April 11 | April 1 |
| First, on or before | October 21 | November 4 | November 20 |
| Season at least | 225 days | 206 days | 186 days |
Station BRONX, NY US (USC00300961). Completeness flag R, 12 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 11.9 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 Mount Vernon · Zone 7b
Check a crop against this station
Mount Vernon, NY
Zone 7bAverage annual extreme minimum 5°F to 10°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
New York. Nearest qualified station: BRONX, NY US (USC00300961), 5.4 miles. Median last 32°F April 1. Median first 32°F November 16. The 50% growing-season length is 230 days.
Open the ZIP page · Crop guides for New York
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | April 12 | April 1 | March 19 |
| First 32°F on or before | November 2 | November 16 | December 4 |
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 Cornell University, Cornell Vegetables, Vegetable planting dates for Upstate New York, retrieved 2026-10-10. It’s based on areas with last spring frost around May 20 and first fall frost around October 1. Dates below are the outdoor ranges printed in that table, not a conversion into weeks before frost.
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