Frost dates for ZIP 78643 (Llano, 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, Llano, TX (6 miles away).
- Average last spring frostMar 2050% chance of a 32°F freeze after this date
- Average first fall frostNov 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)235 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°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) | Feb 28 |
| 50% (the "average" last frost) | Mar 20 |
| 10% (safe-side: only 1 year in 10 freezes later) | Apr 11 |
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) | Oct 28 |
| 50% (the "average" first frost) | Nov 10 |
| 90% (late: most years have frozen by now) | Nov 30 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 4 | Nov 3 |
| 32°F (freeze) | Mar 20 | Nov 10 |
| 28°F (hard freeze) | Mar 5 | Nov 21 |
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 Llano
Soil temperature now
2-inch depth
64°F 55°F or warmer
24-hour average · latest 66°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Don Daniel Mason (22 mi), Paul Tybor Gillespie (29 mi), Sloan Ranch San Saba (29 mi).
4-inch depth
66°F 55°F or warmer
24-hour average · latest 68°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Don Daniel Mason (22 mi), Paul Tybor Gillespie (29 mi), Sloan Ranch San Saba (29 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 | 42° | Partly Cloudy | |
| Sunday | 70° | 46° | Sunny |
| Monday | 76° | 51° | Mostly Sunny |
| Tuesday | 80° | 54° | Sunny |
| Wednesday | 83° | 56° | Sunny |
| Thursday | 86° | 57° | Sunny |
| Friday | 85° | 60° | Mostly 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 78643
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: Llano, TX (NOAA GHCN-Daily ID USC00415272), elevation 1,020 ft, 5.7 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Burnet Muni AP, TX | 29 mi | Mar 6 | Nov 23 |
| Burnet, TX | 29 mi | Mar 15 | Nov 11 |
| Mason, TX | 31 mi | Mar 18 | Nov 13 |
The average last-frost dates of these stations span 14 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 78643?
The average (50% chance) last spring freeze of 32°F for ZIP 78643 is March 20. For a safer planting date, use April 11, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78643?
The average first fall freeze is November 10. In 1 year in 10 it comes by October 28.
What hardiness zone is 78643?
ZIP 78643 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
Other ZIP codes in Llano County
76831 76885 78607 78609 78639 78657 78672 All Llano County ZIPs