When is the last frost in Port Lavaca, TX?

For ZIP code 77979, the average last spring frost (32°F) is February 1, based on NOAA 1991-2020 climate normals for the Pt Comfort, TX weather station. There is a 1-in-10 chance of a frost after March 4.

When is the first frost in Port Lavaca, TX?

The average first fall frost (32°F) is December 21. There is a 1-in-10 chance of frost by November 25, so tender plants are at risk from that point on.

How long is the growing season in 77979?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 321 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 77979Port Lavaca, TX

The average last spring frost in Port Lavaca is February 1 and the average first fall frost is December 21, giving a typical growing season of about 321 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 1
Average first fall frost: Dec 21
Growing season: 321 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 25 · Feb 22 · Mar 18	Nov 10 · Dec 3 · Dec 28	285 days	100%
Frost / freeze (32°F)	Dec 24 · Feb 1 · Mar 4	Nov 25 · Dec 21 · Jan 18	321 days	93%
Hard freeze (28°F)	Dec 17 · Jan 21 · Feb 23	Dec 8 · Jan 1 · Feb 6	358 days	58%

Where these dates come from

ZIP code 77979 is matched to the NOAA station Pt Comfort, TX, 9.3 km away, at 20 ft elevation (4 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Pt Comfort, TX (used)	20 ft	Feb 1	Dec 21
Port O'Connor, TX	5 ft	Feb 4	Dec 27
Austwell, TX	23 ft	Jan 30	Dec 27
Aransas Wr, TX	15 ft	Feb 7	Dec 13

Frost dates near Port Lavaca

Point Comfort, TX 77978 · last Feb 1, first Dec 21
La Salle, TX 77969 · last Feb 1, first Dec 21
Placedo, TX 77977 · last Feb 4, first Dec 9
Seadrift, TX 77983 · last Feb 7, first Dec 13
Vanderbilt, TX 77991 · last Feb 1, first Dec 21
Lolita, TX 77971 · last Feb 1, first Dec 21
Bloomington, TX 77951 · last Feb 4, first Dec 9
Port O Connor, TX 77982 · last Feb 4, first Dec 27

Frequently asked questions

When is the last frost in Port Lavaca, TX?: For ZIP code 77979, the average last spring frost (32°F) is February 1, based on NOAA 1991-2020 climate normals for the Pt Comfort, TX weather station. There is a 1-in-10 chance of a frost after March 4.
When is the first frost in Port Lavaca, TX?: The average first fall frost (32°F) is December 21. There is a 1-in-10 chance of frost by November 25, so tender plants are at risk from that point on.
How long is the growing season in 77979?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 321 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.