Frost dates / Texas / Rowlett
Frost dates in Rowlett, TX
The station on this page is LAVON DAM, TX US (USC00415094), 9 miles from the city point. Population in the Census 2024 estimate is 68,123.
Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 75089 (1.5 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% | February 20 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 10 | Median. |
| 10% | March 31 | 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 5 | 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% | 278 |
| 50% | 254 |
| 90% | 227 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 17 | February 26 | February 1 |
| First, on or before | November 13 | December 1 | December 22 |
| Season at least | 307 days | 278 days | 252 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 16 | March 26 | March 4 |
| First, on or before | October 25 | November 8 | November 25 |
| Season at least | 255 days | 228 days | 202 days |
Station LAVON DAM, TX US (USC00415094). 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 155.4 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 Rowlett · Zone 8b
Check a crop against this station
Rowlett, TX
Zone 8bAverage annual extreme minimum 15°F to 20°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Texas. Nearest qualified station: LAVON DAM, TX US (USC00415094), 9 miles. Median last 32°F March 10. Median first 32°F November 19. The 50% growing-season length is 254 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 31 | March 10 | February 20 |
| First 32°F on or before | November 1 | November 19 | December 5 |
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.