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Frost dates / Indiana / Fort Wayne

Frost dates in Fort Wayne, IN

The station on this page is FT WAYNE INTL AP, IN US (USW00014827), 8.8 miles from the city point. Population in the Census 2024 estimate is 273,203.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 46805 (1.5 miles from the city point used on this page).

Median last 32°F is April 24. Median first 32°F is October 21. The 50% growing-season length is 178 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.

ProbabilityDateHow to read it
90%April 10Earlier date. A last 32°F on or after this day is common.
50%April 24Median.
10%May 10Later 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.

ProbabilityDateHow to read it
10%October 8Earlier date. A first 32°F on or before this day is uncommon.
50%October 21Median.
90%November 1Later 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 longDays
10%199
50%178
90%157

28°F threshold

10%50%90%
Last, on or afterApril 28April 12March 28
First, on or beforeOctober 19November 1November 16
Season at least222 days203 days182 days

36°F threshold

10%50%90%
Last, on or afterMay 18May 4April 20
First, on or beforeSeptember 25October 9October 22
Season at least176 days156 days138 days

Station FT WAYNE INTL AP, IN US (USW00014827). 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 241.1 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Fort Wayne, IN

Zone 6aAverage annual extreme minimum -10°F to -5°F

Median last 32°F is April 24. Median first 32°F is October 21. The 50% growing-season length is 178 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%

Indiana. Nearest qualified station: FT WAYNE INTL AP, IN US (USW00014827), 8.8 miles. Median last 32°F April 24. Median first 32°F October 21. The 50% growing-season length is 178 days.

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32°F probabilities at this station
10%50%90%
Last 32°F on or afterMay 10April 24April 10
First 32°F on or beforeOctober 8October 21November 1

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.

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Planting calendar

Frost dates for Indiana 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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