When is the last frost in Geismar, LA?

For ZIP code 70734, the average last spring frost (32°F) is February 9, based on NOAA 1991-2020 climate normals for the Carville 2 Sw, LA weather station. There is a 1-in-10 chance of a frost after March 10.

When is the first frost in Geismar, LA?

The average first fall frost (32°F) is December 13. There is a 1-in-10 chance of frost by November 16, so tender plants are at risk from that point on.

How long is the growing season in 70734?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 308 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 70734Geismar, LA

The average last spring frost in Geismar is February 9 and the average first fall frost is December 13, giving a typical growing season of about 308 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 9
Average first fall frost: Dec 13
Growing season: 308 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 1 · Feb 28 · Mar 19	Nov 6 · Nov 27 · Dec 20	276 days	100%
Frost / freeze (32°F)	Jan 12 · Feb 9 · Mar 10	Nov 16 · Dec 13 · Jan 11	308 days	98%
Hard freeze (28°F)	Dec 30 · Jan 27 · Feb 27	Dec 4 · Jan 1 · Feb 1	341 days	76%

Where these dates come from

ZIP code 70734 is matched to the NOAA station Carville 2 Sw, LA, 11.6 km away, at 25 ft elevation (9 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Carville 2 Sw, LA (used)	25 ft	Feb 9	Dec 13
Donaldsonville 4 Sw, LA	30 ft	Feb 21	Dec 5
Lsu Ben-Hur Farm, LA	21 ft	Feb 28	Nov 26
Brusly 2 W, LA	20 ft	Feb 28	Nov 24

Frost dates near Geismar

Carville, LA 70721 · last Feb 9, first Dec 13
Saint Gabriel, LA 70776 · last Feb 9, first Dec 13
Gonzales, LA 70737 · last Feb 9, first Dec 13
Duplessis, LA 70728 · last Feb 9, first Dec 13
Darrow, LA 70725 · last Feb 21, first Dec 5
Prairieville, LA 70769 · last Feb 9, first Dec 13
Burnside, LA 70738 · last Feb 21, first Dec 5
Donaldsonville, LA 70346 · last Feb 21, first Dec 5

Frequently asked questions

When is the last frost in Geismar, LA?: For ZIP code 70734, the average last spring frost (32°F) is February 9, based on NOAA 1991-2020 climate normals for the Carville 2 Sw, LA weather station. There is a 1-in-10 chance of a frost after March 10.
When is the first frost in Geismar, LA?: The average first fall frost (32°F) is December 13. There is a 1-in-10 chance of frost by November 16, so tender plants are at risk from that point on.
How long is the growing season in 70734?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 308 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.