Frost dates / Michigan / Dearborn Heights
Frost dates in Dearborn Heights, MI
The station on this page is DEARBORN, MI US (USC00202015), 2.8 miles from the city point. Population in the Census 2024 estimate is 61,040.
Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 48127 (0.3 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 17 | Earlier date. A last 32°F on or after this day is common. |
| 50% | May 1 | Median. |
| 10% | May 18 | 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 1 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 15 | Median. |
| 90% | October 28 | 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% | 186 |
| 50% | 166 |
| 90% | 147 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 7 | April 20 | April 5 |
| First, on or before | October 13 | October 28 | November 12 |
| Season at least | 211 days | 190 days | 169 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 27 | May 12 | April 27 |
| First, on or before | September 24 | October 5 | October 18 |
| Season at least | 165 days | 146 days | 128 days |
Station DEARBORN, MI US (USC00202015). 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 184.4 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
Dearborn Heights, MI
Zone 6bAverage annual extreme minimum -5°F to 0°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Michigan. Nearest qualified station: DEARBORN, MI US (USC00202015), 2.8 miles. Median last 32°F May 1. Median first 32°F October 15. The 50% growing-season length is 166 days.
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | May 18 | May 1 | April 17 |
| First 32°F on or before | October 1 | October 15 | October 28 |
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
Frost dates for Michigan 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.
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