Last spring frost
Mar 10
Frost Dates for Box Canyon, TX
First fall frost
Nov 16
Growing season
251 days
Hardiness zone
8b
In an average year around Box Canyon, TX, the last spring frost (32°F) is about Mar 10 and the first fall frost is about Nov 16, giving roughly a 251-day growing season. To be safe most years, wait until Feb 19 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Apr 17 | Mar 28 | Mar 3 |
| Freeze (32°F) | Apr 4 | Mar 10 | Feb 19 |
| Hard (28°F) | Mar 17 | Feb 25 | Jan 31 |
| Severe (24°F) | Mar 7 | Feb 6 | Dec 30 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 17 | Apr 9 | Apr 4 | Apr 1 | Mar 28 | Mar 23 | Mar 17 | Mar 11 | Mar 3 |
| 32°F | Apr 4 | Mar 28 | Mar 20 | Mar 15 | Mar 10 | Mar 5 | Mar 1 | Feb 25 | Feb 19 |
| 28°F | Mar 17 | Mar 10 | Mar 5 | Feb 28 | Feb 25 | Feb 19 | Feb 14 | Feb 8 | Jan 31 |
| 24°F | Mar 7 | Feb 27 | Feb 20 | Feb 13 | Feb 6 | Jan 31 | Jan 25 | Jan 15 | Dec 30 |
| 20°F | Feb 19 | Feb 7 | Feb 1 | Jan 25 | Jan 16 | Jan 7 | Dec 31 | Dec 23 | Dec 11 |
| 16°F | Feb 3 | Jan 28 | Jan 16 | Jan 9 | Jan 4 | Jan 1 | Dec 28 | Dec 20 | Dec 12 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 25 | Nov 6 | Nov 22 |
| Freeze (32°F) | Nov 1 | Nov 16 | Dec 4 |
| Hard (28°F) | Nov 11 | Nov 29 | Dec 20 |
| Severe (24°F) | Nov 21 | Dec 11 | Jan 16 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 25 | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 22 |
| 32°F | Nov 1 | Nov 5 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 4 |
| 28°F | Nov 11 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 2 | Dec 6 | Dec 11 | Dec 20 |
| 24°F | Nov 21 | Nov 28 | Dec 2 | Dec 6 | Dec 11 | Dec 17 | Dec 24 | Jan 1 | Jan 16 |
| 20°F | Nov 29 | Dec 6 | Dec 12 | Dec 21 | Dec 27 | Jan 1 | Jan 8 | Jan 19 | Feb 2 |
| 16°F | Dec 10 | Dec 19 | Dec 25 | Jan 1 | Jan 2 | Jan 4 | Jan 10 | Jan 18 | Feb 1 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Hudspeth Rvr Rch, Tx, about 8.2 miles away@if(!empty($station['elevation_ft'])), at 1,570 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Box Canyon, TX?
On average, the last spring frost (32°F) around Box Canyon, TX is about Mar 10. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 19.
When is the first frost in the fall?
The first fall frost around Box Canyon, TX typically arrives about Nov 16. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Mar 10 on average, or Feb 19 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 251 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 78837 Planting calendar → Texas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026