Frost dates for ZIP 78067 (San Ygnacio, TX)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Zapata 1 S, TX (17 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 77% of years (about 4 freezing night(s) a year on average). The dates below describe freeze timing for the station's record; in many years there may be no 32°F freeze at all.
- Average last spring frostJan 1950% chance of a 32°F freeze after this date
- Average first fall frostDec 2250% chance of a 32°F freeze by this date
- Growing season (frost-free)341 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°F avg. coldest night
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Dec 17 (prior Dec) |
| 50% (the "average" last frost) | Jan 19 |
| 10% (safe-side: only 1 year in 10 freezes later) | Feb 25 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 28 |
| 50% (the "average" first frost) | Dec 22 |
| 90% (late: most years have frozen by now) | Jan 27 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Feb 9 | Dec 6 |
| 32°F (freeze) | Jan 19 | Dec 22 |
| 28°F (hard freeze) | Jan 5 | Jan 1 (next year) |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
This week in San Ygnacio
Soil temperature now
2-inch depth
78°F 55°F or warmer
24-hour average · latest 82°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Rancho Las Comitas (51 mi).
4-inch depth
80°F 55°F or warmer
24-hour average · latest 83°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Rancho Las Comitas (51 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
No frost in the 7-day forecast.
| Period | High | Low | Forecast |
|---|---|---|---|
| Tonight | 51° | Mostly Clear | |
| Sunday | 78° | 59° | Mostly Sunny |
| Monday | 85° | 66° | Partly Sunny |
| Tuesday | 91° | 68° | Mostly Sunny |
| Wednesday | 92° | 68° | Mostly Sunny then Chance Rain Showers |
| Thursday | 94° | 67° | Sunny |
| Friday | 94° | 70° | Sunny |
National Weather Service forecast, issued Oct 17, 8:28 PM CDT. Frost can form above 32°F on clear, calm nights. Full NWS forecast.
Free frost alerts for 78067
An email when the National Weather Service forecasts a freeze for this ZIP, plus the spring soil-temperature heads-up. At most a few a month.
Alerts open soon. This form is a preview and doesn't send anything yet.
Where these numbers come from
Station: Zapata 1 S, TX (NOAA GHCN-Daily ID USC00419976), elevation 320 ft, 17.5 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Laredo AFB, TX | 30 mi | Jan 20 | Dec 25 |
| Laredo 2, TX | 33 mi | Jan 25 | Dec 17 |
| Bruni, TX | 40 mi | Jan 30 | Dec 18 |
The average last-frost dates of these stations span 11 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 78067?
The average (50% chance) last spring freeze of 32°F for ZIP 78067 is January 19. For a safer planting date, use February 25, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78067?
The average first fall freeze is December 22. In 1 year in 10 it comes by November 28.
What hardiness zone is 78067?
ZIP 78067 is in USDA zone 9b (25 to 30°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.