Frost dates / Texas / Houston
Frost dates in Houston, TX
The station on this page is HOUSTON HOBBY AP, TX US (USW00012918), 12.1 miles from the city point. Population in the Census 2024 estimate is 2,390,125.
Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 77009 (1.4 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% | December 29 | Earlier date. A last 32°F on or after this day is common. |
| 50% | January 30 | Median. |
| 10% | March 1 | 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 27 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | December 28 | Median. |
| 90% | January 27 | 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% | 365 |
| 50% | 330 |
| 90% | 292 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | February 17 | January 17 | December 22 |
| First, on or before | December 12 | January 8 | February 4 |
| Season at least | 365 days | 365 days | 329 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 12 | February 17 | January 20 |
| First, on or before | November 15 | December 4 | January 3 |
| Season at least | 328 days | 293 days | 260 days |
Station HOUSTON HOBBY AP, TX US (USW00012918). 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 85.9%. Freeze dates are conditional on that threshold occurring. Elevation 13.4 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 Houston · Zone 9b
Check a crop against this station
Houston, TX
Zone 9bAverage annual extreme minimum 25°F to 30°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Texas. Nearest qualified station: HOUSTON HOBBY AP, TX US (USW00012918), 12.1 miles. Median last 32°F January 30. Median first 32°F December 28. The 50% growing-season length is 330 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 1 | January 30 | December 29 |
| First 32°F on or before | November 27 | December 28 | January 27 |
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.
Date checks use your device’s calendar and appear after the page loads.