Frost dates / Texas / Conroe

Frost dates in Conroe, TX

The station on this page is CONROE MONTGOMERY CO AP, TX US (USW00053902), 4.6 miles from the city point. Population in the Census 2024 estimate is 114,581.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 77304 (1.9 miles from the city point used on this page).

Median last 32°F is March 11. Median first 32°F is November 19. The 50% growing-season length is 253 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%	February 14	Earlier date. A last 32°F on or after this day is common.
50%	March 11	Median.
10%	April 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%	November 1	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 19	Median.
90%	December 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%	286
50%	253
90%	224

28°F threshold

	10%	50%	90%
Last, on or after	March 18	February 21	January 22
First, on or before	November 11	December 4	January 8
Season at least	333 days	291 days	253 days

36°F threshold

	10%	50%	90%
Last, on or after	April 15	March 24	March 3
First, on or before	October 24	November 8	November 26
Season at least	254 days	227 days	202 days

Station CONROE MONTGOMERY CO AP, TX US (USW00053902). Completeness flag R, 23 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 74.7 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 Conroe · Zone 9a

Check a crop against this station

Conroe, TX

Zone 9aAverage annual extreme minimum 20°F to 25°F

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

Texas. Nearest qualified station: CONROE MONTGOMERY CO AP, TX US (USW00053902), 4.6 miles. Median last 32°F March 11. Median first 32°F November 19. The 50% growing-season length is 253 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 3	March 11	February 14
First 32°F on or before	November 1	November 19	December 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.

A wall calendar surrounded by vegetables, herbs, seed packets, and watering cans.

Planting calendar

Windows below are from Texas A&M AgriLife Extension, Texas Home Vegetable Gardening Guide, retrieved 2026-10-10. Table 8 is statewide and is written as weeks before or after the frost-free date (spring) and the first freeze date (fall). It is not a single calendar date for every Texas city.

Crop

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