Frost dates / Texas / Huntsville
Frost dates in Huntsville, TX
The station on this page is HUNTSVILLE MUNI AP, TX US (USW00053903), 3.5 miles from the city point. Population in the Census 2024 estimate is 49,500.
Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 77341 (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% | January 31 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 2 | Median. |
| 10% | March 24 | 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 7 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 26 | Median. |
| 90% | December 19 | 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% | 307 |
| 50% | 272 |
| 90% | 240 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 10 | February 8 | January 8 |
| First, on or before | November 20 | December 16 | January 17 |
| Season at least | 347 days | 309 days | 272 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 6 | March 15 | February 22 |
| First, on or before | October 30 | November 14 | December 1 |
| Season at least | 270 days | 243 days | 216 days |
Station HUNTSVILLE MUNI AP, TX US (USW00053903). Completeness flag R, 21 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 111.6 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 Huntsville · Zone 9a
Check a crop against this station
Huntsville, 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: HUNTSVILLE MUNI AP, TX US (USW00053903), 3.5 miles. Median last 32°F March 2. Median first 32°F November 26. The 50% growing-season length is 272 days.
Open the ZIP page · Crop guides for Texas
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | March 24 | March 2 | January 31 |
| First 32°F on or before | November 7 | November 26 | December 19 |
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 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.
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