Frost dates / Texas / Rockwall
Frost dates in Rockwall, TX
The station on this page is LAVON DAM, TX US (USC00415094), 8.6 miles from the city point. Population in the Census 2024 estimate is 53,547.
Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 75087 (2.1 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 Rockwall · Zone 8b
Check a crop against this station
Rockwall, 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), 8.6 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.