Frost dates / Indiana / Bloomington

Frost dates in Bloomington, IN

The station on this page is BLOOMINGTON INDIANA UNIV, IN US (USC00120784), 0.7 miles from the city point. Population in the Census 2024 estimate is 79,986.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 47405 (0.3 miles from the city point used on this page).

Median last 32°F is April 15. Median first 32°F is October 26. The 50% growing-season length is 192 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.

Probability	Date	How to read it
90%	March 31	Earlier date. A last 32°F on or after this day is common.
50%	April 15	Median.
10%	May 3	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 9	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%	169

28°F threshold

	10%	50%	90%
Last, on or after	April 22	April 2	March 19
First, on or before	October 23	November 4	November 21
Season at least	238 days	216 days	191 days

36°F threshold

	10%	50%	90%
Last, on or after	May 14	April 28	April 11
First, on or before	October 1	October 16	October 28
Season at least	192 days	170 days	149 days

Station BLOOMINGTON INDIANA UNIV, IN US (USC00120784). Completeness flag S, 28 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 253 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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Bloomington, IN

Zone 6bAverage annual extreme minimum -5°F to 0°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Indiana. Nearest qualified station: BLOOMINGTON INDIANA UNIV, IN US (USC00120784), 0.7 miles. Median last 32°F April 15. Median first 32°F October 26. The 50% growing-season length is 192 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 3	April 15	March 31
First 32°F on or before	October 11	October 26	November 9

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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