When is the last frost in Tynan, TX?

For ZIP code 78391, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the Mathis 4 Ssw, TX weather station. There is a 1-in-10 chance of a frost after March 4.

When is the first frost in Tynan, TX?

The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by November 28, so tender plants are at risk from that point on.

How long is the growing season in 78391?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 328 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 78391Tynan, TX

The average last spring frost in Tynan is January 31 and the average first fall frost is December 23, giving a typical growing season of about 328 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 31
Average first fall frost: Dec 23
Growing season: 328 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	Jan 20 · Feb 21 · Mar 16	Nov 14 · Dec 4 · Jan 2	289 days	99%
Frost / freeze (32°F)	Dec 22 · Jan 31 · Mar 4	Nov 28 · Dec 23 · Jan 28	328 days	89%
Hard freeze (28°F)	Dec 16 · Jan 13 · Feb 20	Dec 7 · Jan 2 · Feb 7	363 days	50%

Where these dates come from

ZIP code 78391 is matched to the NOAA station Mathis 4 Ssw, TX, 18.7 km away, at 138 ft elevation (26 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Mathis 4 Ssw, TX (used)	138 ft	Jan 31	Dec 23
Sinton, TX	48 ft	Feb 1	Dec 17
Beeville 5 Ne, TX	255 ft	Feb 17	Dec 8
Welder Wildlife Foundation, TX	50 ft	Feb 24	Dec 1

Frost dates near Tynan

Skidmore, TX 78389 · last Jan 31, first Dec 23
Mathis, TX 78368 · last Jan 31, first Dec 23
Sandia, TX 78383 · last Jan 31, first Dec 23
Dinero, TX 78350 · last Jan 31, first Dec 23
Edroy, TX 78352 · last Feb 1, first Dec 17
Beeville, TX 78104 · last Feb 17, first Dec 8
Sinton, TX 78387 · last Feb 1, first Dec 17
Odem, TX 78370 · last Feb 1, first Dec 17

Frequently asked questions

When is the last frost in Tynan, TX?: For ZIP code 78391, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the Mathis 4 Ssw, TX weather station. There is a 1-in-10 chance of a frost after March 4.
When is the first frost in Tynan, TX?: The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by November 28, so tender plants are at risk from that point on.
How long is the growing season in 78391?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 328 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.