When is the last frost in Crystal City, TX?

For ZIP code 78839, the average last spring frost (32°F) is February 10, based on NOAA 1991-2020 climate normals for the Crystal City, TX weather station. There is a 1-in-10 chance of a frost after March 9.

When is the first frost in Crystal City, TX?

The average first fall frost (32°F) is December 10. There is a 1-in-10 chance of frost by November 19, so tender plants are at risk from that point on.

How long is the growing season in 78839?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 307 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 78839Crystal City, TX

The average last spring frost in Crystal City is February 10 and the average first fall frost is December 10, giving a typical growing season of about 307 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 10
Average first fall frost: Dec 10
Growing season: 307 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)	Feb 2 · Feb 28 · Mar 18	Nov 8 · Nov 28 · Dec 19	275 days	100%
Frost / freeze (32°F)	Jan 6 · Feb 10 · Mar 9	Nov 19 · Dec 10 · Jan 9	307 days	98%
Hard freeze (28°F)	Dec 15 · Jan 20 · Feb 28	Dec 1 · Dec 26 · Feb 6	346 days	77%

Where these dates come from

ZIP code 78839 is matched to the NOAA station Crystal City, TX, 1 km away, at 580 ft elevation (4 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Crystal City, TX (used)	580 ft	Feb 10	Dec 10
Carrizo Springs 3S, TX	613 ft	Mar 5	Nov 22
Dilley, TX	550 ft	Feb 16	Dec 6
Eagle Pass 3N, TX	812 ft	Feb 19	Dec 1

Frost dates near Crystal City

Carrizo Springs, TX 78834 · last Mar 5, first Nov 22
Big Wells, TX 78830 · last Feb 10, first Dec 10
Asherton, TX 78827 · last Mar 5, first Nov 22
La Pryor, TX 78872 · last Feb 10, first Dec 10
Batesville, TX 78829 · last Feb 10, first Dec 10
Catarina, TX 78836 · last Mar 5, first Nov 22
El Indio, TX 78860 · last Feb 19, first Dec 1
Uvalde, TX 78801 · last Mar 6, first Nov 20

Frequently asked questions

When is the last frost in Crystal City, TX?: For ZIP code 78839, the average last spring frost (32°F) is February 10, based on NOAA 1991-2020 climate normals for the Crystal City, TX weather station. There is a 1-in-10 chance of a frost after March 9.
When is the first frost in Crystal City, TX?: The average first fall frost (32°F) is December 10. There is a 1-in-10 chance of frost by November 19, so tender plants are at risk from that point on.
How long is the growing season in 78839?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 307 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.